GitHub/exynos8895/android_kernel_samsung_universal8895.git
12 years agodrm/i915: Guard pages being reaped by OOM whilst binding-to-GTT
Chris Wilson [Tue, 20 Nov 2012 10:45:16 +0000 (10:45 +0000)]
drm/i915: Guard pages being reaped by OOM whilst binding-to-GTT

In the circumstances that the shrinker is allowed to steal the mutex
in order to reap pages, we need to be careful to prevent it operating on
the current object and shooting ourselves in the foot.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: Remove bogus test for a present execbuffer
Chris Wilson [Mon, 19 Nov 2012 15:30:42 +0000 (15:30 +0000)]
drm/i915: Remove bogus test for a present execbuffer

The intention of checking obj->gtt_offset!=0 is to verify that the
target object was listed in the execbuffer and had been bound into the
GTT. This is guarranteed by the earlier rearrangement to split the
execbuffer operation into reserve and relocation phases and then
verified by the check that the target handle had been processed during
the reservation phase.

However, the actual checking of obj->gtt_offset==0 is bogus as we can
indeed reference an object at offset 0. For instance, the framebuffer
installed by the BIOS often resides at offset 0 - causing EINVAL as we
legimately try to render using the stolen fb.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: Remove save/restore of physical HWS_PGA register
Chris Wilson [Fri, 16 Nov 2012 11:43:21 +0000 (11:43 +0000)]
drm/i915: Remove save/restore of physical HWS_PGA register

Now that we always restore the HWS registers (both physical and GTT
virtual addresses) when re-initialising the rings, we can eliminate the
superfluous save/restore of the register across suspend and resume.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: Fix warning in i915_gem_chipset_flush
Ben Widawsky [Thu, 15 Nov 2012 20:06:09 +0000 (12:06 -0800)]
drm/i915: Fix warning in i915_gem_chipset_flush

drivers/gpu/drm/i915/i915_drv.h:1545:2: warning: '______f' is static but
declared in inline function 'i915_gem_chipset_flush' which is not static

Reported-by: kbuild test robot <fengguang.wu@intel.com>
dri-devel-Reference: <50a4d41c.586VhmwghPuKZbkB%fengguang.wu@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: Only check for valid PP_{ON, OFF}_DELAYS on pre ILK hardware
Damien Lespiau [Wed, 31 Oct 2012 19:23:16 +0000 (19:23 +0000)]
drm/i915: Only check for valid PP_{ON, OFF}_DELAYS on pre ILK hardware

ILK+ have this register on the PCH. This check was triggering unclaimed
writes.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: drop buggy write to FDI_RX_CHICKEN register
Daniel Vetter [Wed, 14 Nov 2012 16:47:39 +0000 (17:47 +0100)]
drm/i915: drop buggy write to FDI_RX_CHICKEN register

Jani Nikula noticed that the parentheses are wrong and we & the bit
with the register address instead of the read-back value. He sent a
patch to correct that.

On second look, we write the same register in the previous line, and
the w/a seems to be to set FDI_RX_PHASE_SYNC_POINTER_OVR to enable the
logic, then keep always set FDI_RX_PHASE_SYNC_POINTER_OVR and toggle
FDI_RX_PHASE_SYNC_POINTER_EN before/after enabling the pc transcoder.

So the right things seems to be to simply kill the 2nd write.

Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
[danvet: Dropped a bogus ~ from the commit message that somehow crept
in.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: Use LRI to update the semaphore registers
Chris Wilson [Wed, 14 Nov 2012 09:15:14 +0000 (09:15 +0000)]
drm/i915: Use LRI to update the semaphore registers

The bspec was recently updated to remove the ability to update the
semaphore using the MI_SEMAPHORE_BOX command, the ability to wait upon
the semaphore value remained. Instead the advice is to update the
register using the MI_LOAD_REGISTER_IMM command. In cursory testing,
semaphores continue to function - the question is whether this fixes
some of the deadlocks where the semaphore registers contained stale
values?

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel J Blueman <daniel@quora.org>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: add LynxPoint-LP PCH ID
Wei Shun Chang [Mon, 12 Nov 2012 20:54:13 +0000 (18:54 -0200)]
drm/i915: add LynxPoint-LP PCH ID

[pzanoni: rebase, print it's an LP PCH]

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Tested-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: Optimize DIV_ROUND_CLOSEST call
Jean Delvare [Mon, 12 Nov 2012 13:18:02 +0000 (14:18 +0100)]
drm/i915: Optimize DIV_ROUND_CLOSEST call

DIV_ROUND_CLOSEST is faster if the compiler knows it will only be
dealing with unsigned dividends. This optimization rips 32 bytes of
binary code on x86_64.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: David Airlie <airlied@linux.ie>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/vmwgfx: Make vmw_dmabuf_unreference handle NULL objects
Thomas Hellstrom [Fri, 9 Nov 2012 12:26:15 +0000 (12:26 +0000)]
drm/vmwgfx: Make vmw_dmabuf_unreference handle NULL objects

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Dmitry Torokhov <dtor@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/vmwgfx: Refactor module load to not require fifo unless fbdev is loaded
Thomas Hellstrom [Fri, 9 Nov 2012 12:26:14 +0000 (12:26 +0000)]
drm/vmwgfx: Refactor module load to not require fifo unless fbdev is loaded

This also fixes a bug where the fence manager was left without irq
enabled when waiting for fences, causing various errors at module
load time

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Dmitry Torokhov <dtor@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/vmwgfx: Make screen object code not require fifo at init time
Thomas Hellstrom [Fri, 9 Nov 2012 12:26:13 +0000 (12:26 +0000)]
drm/vmwgfx: Make screen object code not require fifo at init time

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Dmitry Torokhov <dtor@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/vmwgfx: Make overlay code not require fifo at init time
Thomas Hellstrom [Fri, 9 Nov 2012 12:26:12 +0000 (12:26 +0000)]
drm/vmwgfx: Make overlay code not require fifo at init time

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Dmitry Torokhov <dtor@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/vmwgfx: Enable traces *after* we've hidden SVGA
Thomas Hellstrom [Fri, 9 Nov 2012 12:26:11 +0000 (12:26 +0000)]
drm/vmwgfx: Enable traces *after* we've hidden SVGA

Hiding SVGA seems to trigger a VGA screen clear, and with no
traces dirty it doesn't seem to repaint

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Dmitry Torokhov <dtor@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/ttm: alter cpu_writers to return -EBUSY in ttm_execbuf_util reservations
Maarten Lankhorst [Tue, 6 Nov 2012 13:39:43 +0000 (14:39 +0100)]
drm/ttm: alter cpu_writers to return -EBUSY in ttm_execbuf_util reservations

This is similar to other platforms that don't allow command submission
to buffers locked on the cpu.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/ttm: Optimize reservation slightly
Thomas Hellstrom [Tue, 6 Nov 2012 11:31:51 +0000 (11:31 +0000)]
drm/ttm: Optimize reservation slightly

Reservation locking currently always takes place under the LRU spinlock.
Hence, strictly there is no need for an atomic_cmpxchg call; we can use
atomic_read followed by atomic_write since nobody else will ever reserve
without the lru spinlock held.
At least on Intel this should remove a locked bus cycle on successful
reserve.

Note that thit commit may be obsoleted by the cross-device reservation work.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/ttm, drm/vmwgfx: Use RCU locking for object lookups v3
Thomas Hellstrom [Tue, 6 Nov 2012 11:31:50 +0000 (11:31 +0000)]
drm/ttm, drm/vmwgfx: Use RCU locking for object lookups v3

The mostly used lookup+get put+potential_destroy path of TTM objects
is converted to use RCU locks. This will substantially decrease the amount
of locked bus cycles during normal operation.
Since we use kfree_rcu to free the objects, no rcu synchronization is needed
at module unload time.

v2: Don't touch include/linux/kref.h
v3: Adapt to kref_get_unless_zero return value change

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agokref: Implement kref_get_unless_zero v3
Thomas Hellstrom [Tue, 6 Nov 2012 11:31:49 +0000 (11:31 +0000)]
kref: Implement kref_get_unless_zero v3

This function is intended to simplify locking around refcounting for
objects that can be looked up from a lookup structure, and which are
removed from that lookup structure in the object destructor.
Operations on such objects require at least a read lock around
lookup + kref_get, and a write lock around kref_put + remove from lookup
structure. Furthermore, RCU implementations become extremely tricky.
With a lookup followed by a kref_get_unless_zero *with return value check*
locking in the kref_put path can be deferred to the actual removal from
the lookup structure and RCU lookups become trivial.

v2: Formatting fixes.
v3: Invert the return value.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm: Make hashtab rcu-safe
Thomas Hellstrom [Tue, 6 Nov 2012 11:31:48 +0000 (11:31 +0000)]
drm: Make hashtab rcu-safe

TTM base objects will be the first consumer.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/ttm: remove sync_arg from driver functions
Maarten Lankhorst [Fri, 12 Oct 2012 15:04:00 +0000 (15:04 +0000)]
drm/ttm: remove sync_arg from driver functions

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-By: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/ttm: remove sync_obj_arg from ttm_bo_move_accel_cleanup
Maarten Lankhorst [Fri, 12 Oct 2012 15:03:11 +0000 (15:03 +0000)]
drm/ttm: remove sync_obj_arg from ttm_bo_move_accel_cleanup

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-By: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/ttm: remove sync_obj_arg member
Maarten Lankhorst [Fri, 12 Oct 2012 15:02:19 +0000 (15:02 +0000)]
drm/ttm: remove sync_obj_arg member

vmwgfx was its only user and always sets it to the same..

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-By: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/vmwgfx: remove use of fence_obj_args
Maarten Lankhorst [Fri, 12 Oct 2012 15:01:43 +0000 (15:01 +0000)]
drm/vmwgfx: remove use of fence_obj_args

It's always hardcoded to the same value.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-By: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agoDRM/KMS: Add Bail-Out Conditions for Loop.
Egbert Eich [Sat, 13 Oct 2012 11:36:14 +0000 (11:36 +0000)]
DRM/KMS: Add Bail-Out Conditions for Loop.

When trying to obtain an accurate timestamp for the last vsync interrupt
in vblank_disable_and_save() we loop until the vsync counter after reading
the time stamp is identical to the one before.
In the case where no hardware timestamp can be obtained there is probably
no point in trying to make sure we remain within the same vsync during
the time we obtain the counter.
Furthermore we should make sure there's an 'emergency exit' so that we
don't end up in an endless loop when the driver get_vblank_timestamp()
function doesn't manage to return within the same vsync.
This may happen when this function prints out debugging information over
a slow (ie serial) line.

Signed-off-by: Egbert Eich <eich@suse.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm: don't unnecessarily enable the polling work
Daniel Vetter [Wed, 24 Oct 2012 13:35:50 +0000 (13:35 +0000)]
drm: don't unnecessarily enable the polling work

... by properly checking connector->polled. This doesn't matter too
much because the polling work itself gets this slightly more right and
doesn't set repoll if there's nothing to do. But we can do better.

v2: Chris Wilson noticed that I broke polling, since repoll will never
ever be set true. Fix this up, and simplify the logic a bit while at
it.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agovga_switcheroo: Drop unused include and unused variables.
Igor Murzov [Thu, 25 Oct 2012 13:09:01 +0000 (13:09 +0000)]
vga_switcheroo: Drop unused include and unused variables.

Signed-off-by: Igor Murzov <e-mail@date.by>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/nouveau: free memory allocated with alloc_apertures()
Tommi Rantala [Fri, 9 Nov 2012 09:19:40 +0000 (09:19 +0000)]
drm/nouveau: free memory allocated with alloc_apertures()

Fix a memory leak by deallocating the memory we got from
alloc_apertures().

Signed-off-by: Tommi Rantala <tt.rantala@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/radeon: check alloc_apertures() success in radeon_kick_out_firmware_fb()
Tommi Rantala [Fri, 9 Nov 2012 09:19:39 +0000 (09:19 +0000)]
drm/radeon: check alloc_apertures() success in radeon_kick_out_firmware_fb()

Check for alloc_apertures() memory allocation failure, and propagate an
error code in case the allocation failed.

Signed-off-by: Tommi Rantala <tt.rantala@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/mgag200: remove unneeded aper->count assignment after alloc_apertures()
Tommi Rantala [Fri, 9 Nov 2012 09:19:38 +0000 (09:19 +0000)]
drm/mgag200: remove unneeded aper->count assignment after alloc_apertures()

alloc_apertures() already does the assignment for us, so assigning the
count member after the alloc_apertures() call is not needed.

Signed-off-by: Tommi Rantala <tt.rantala@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/mgag200: free memory allocated with alloc_apertures()
Tommi Rantala [Fri, 9 Nov 2012 09:19:37 +0000 (09:19 +0000)]
drm/mgag200: free memory allocated with alloc_apertures()

Fix a memory leak by deallocating the memory we got from
alloc_apertures().

Signed-off-by: Tommi Rantala <tt.rantala@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/mgag200: check alloc_apertures() success in mga_vram_init()
Tommi Rantala [Fri, 9 Nov 2012 09:19:36 +0000 (09:19 +0000)]
drm/mgag200: check alloc_apertures() success in mga_vram_init()

Check for alloc_apertures() memory allocation failure, and propagate an
error code in case the allocation failed.

Signed-off-by: Tommi Rantala <tt.rantala@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/cirrus: check alloc_apertures() success in cirrus_kick_out_firmware_fb()
Tommi Rantala [Fri, 9 Nov 2012 09:19:35 +0000 (09:19 +0000)]
drm/cirrus: check alloc_apertures() success in cirrus_kick_out_firmware_fb()

Check for alloc_apertures() memory allocation failure, and propagate an
error code in case the allocation failed.

Signed-off-by: Tommi Rantala <tt.rantala@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/ttm: remove ttm_mem_global->queue
Marcin Slusarz [Tue, 6 Nov 2012 21:49:54 +0000 (21:49 +0000)]
drm/ttm: remove ttm_mem_global->queue

It's unused.

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/ttm: remove ttm_bo_device->nice_mode
Marcin Slusarz [Tue, 6 Nov 2012 21:49:53 +0000 (21:49 +0000)]
drm/ttm: remove ttm_bo_device->nice_mode

It's unused.

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/ttm: remove ttm_buffer_object->buffer_start
Marcin Slusarz [Tue, 6 Nov 2012 21:49:51 +0000 (21:49 +0000)]
drm/ttm: remove ttm_buffer_object->buffer_start

All drivers set it to 0 and nothing uses it.

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/radeon: Use hweight32
Akinobu Mita [Fri, 9 Nov 2012 12:10:41 +0000 (12:10 +0000)]
drm/radeon: Use hweight32

Use hweight32 instead of counting for each bit

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm: use memchr_inv()
Akinobu Mita [Fri, 9 Nov 2012 12:10:42 +0000 (12:10 +0000)]
drm: use memchr_inv()

Use memchr_inv() to check the specified memory region is filled with zero.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm: add support for monotonic vblank timestamps
Imre Deak [Tue, 23 Oct 2012 18:53:26 +0000 (18:53 +0000)]
drm: add support for monotonic vblank timestamps

Jumps in the vblank and page flip event timestamps cause trouble for
clients, so we should avoid them. The timestamp we get currently with
gettimeofday can jump, so use instead monotonic timestamps.

For backward compatibility use a module flag to revert back to using
gettimeofday timestamps. Add also a DRM_CAP_TIMESTAMP_MONOTONIC flag
that is simply a read only version of the module flag, so that clients
can query this without depending on sysfs.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm: use monotonic time in drm_calc_vbltimestamp_from_scanoutpos
Imre Deak [Tue, 23 Oct 2012 18:53:25 +0000 (18:53 +0000)]
drm: use monotonic time in drm_calc_vbltimestamp_from_scanoutpos

For measuring duration we want to avoid that our start/end timestamps
jump, so use monotonic instead of real time for that.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: mario.kleiner
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm: don't poll forced connectors
Daniel Vetter [Tue, 23 Oct 2012 18:23:38 +0000 (18:23 +0000)]
drm: don't poll forced connectors

Otherwise if the detect callback reports a different state than what
the user forced (rather likely), we continously annoy userspace about
a hotplug uevent.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm: don't start the poll engine in probe_single_connector
Daniel Vetter [Tue, 23 Oct 2012 18:23:36 +0000 (18:23 +0000)]
drm: don't start the poll engine in probe_single_connector

Actually there's a reason this stuff is there, and it's called

commit e58f637bb96d5a0ae0919b9998b891d1ba7e47c9
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Fri Aug 20 09:13:36 2010 +0100

    drm/kms: Add a module parameter to disable polling

The idea has been that users can enable/disable polling at runtime. So
the quick hack has been to just re-enable the output polling if xrandr
asks for the latest state of the connectors.

The problem with that hack is that when we force connectors to another
state than what would be detected, we nicely ping-pong:
- Userspace calls probe, gets the forced state, but polling starts
  again.
- Polling notices that the state is actually different, wakes up
  userspace.
- Repeat.

As that commit already explains, the right fix would be to make the
locking more fine-grained, so that hotplug detection on one output
does not interfere with cursor updates on another crtc.

But that is way too much work. So let's just safe this gross hack by
caching the last-seen state of drm_kms_helper_poll for that driver,
and only fire up the poll engine again if it changed from off to on.

v2: Fixup the edge detection of drm_kms_helper_poll.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=49907
Tested-by: Tvrtko Ursulin <tvrtko.ursulin@onelan.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm: properly init/reset connector status
Daniel Vetter [Tue, 23 Oct 2012 18:23:35 +0000 (18:23 +0000)]
drm: properly init/reset connector status

This can help drivers to make somewhat intelligent decisions in their
->detect callback: If the connector is hpd capable and in the unknown
state, the driver needs to force a full detect cycle. Otherwise it
could just (if it chooses so) to update the connector state from it's
hpd handler directly, and always return that in the ->detect callback.

Atm only drm/i915 calls drm_mode_config_reset at resume time, so other
drivers would need to add that call first before using this facility.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm: run the hpd irq event code directly
Daniel Vetter [Tue, 23 Oct 2012 18:23:34 +0000 (18:23 +0000)]
drm: run the hpd irq event code directly

All drivers already have a work item to run the hpd code, so we don't
need to launch a new one in the helper code. Dave Airlie mentioned
that the cancel+re-queue might paper over DP related hpd ping-pongs,
hence why this is split out.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm: handle HPD and polled connectors separately
Daniel Vetter [Tue, 23 Oct 2012 18:23:33 +0000 (18:23 +0000)]
drm: handle HPD and polled connectors separately

Instead of reusing the polling code for hpd handling, split them up.
This has a few consequences:
- Don't touch HPD capable connectors in the poll loop.
- Only touch HPD capable connectors in drm_helper_hpd_irq_event.
- We could run the HPD handling directly (because all callers already
  use their own work item), but for easier bisect that happens in it's
  own patch.

The ultimate goal is that drivers grow some smarts about which
connectors have received a hotplug event and only call the detect code
of that connector. But that's a second step.

v2: s/hdp/hpd/, noticed by Adam Jackson. I can't type.

v3: Split out the work item removal as requested by Dave Airlie. This
results in a temporary mode_config.hpd_irq_work item to keep things
the same.

v4: In the hpd_irq_event handler don't bail out if other bits than HPD
are set. This is useful where e.g. hpd is unreliably, but mostly
works. Drivers can then set both HPD and POLL flags, and users get the
best of both worlds: Quick hotplug feedback if the hpd works, but
still reliable detection with the polling. The poll loop already works
the same, and doesn't bail if HPD is set.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm: extract drm_kms_helper_hotplug_event
Daniel Vetter [Tue, 23 Oct 2012 18:23:32 +0000 (18:23 +0000)]
drm: extract drm_kms_helper_hotplug_event

Useful if drivers want to be slightly more clever about hotplug
handling.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm: add drm_send_vblank_event() helper (v5)
Rob Clark [Tue, 16 Oct 2012 22:48:40 +0000 (22:48 +0000)]
drm: add drm_send_vblank_event() helper (v5)

A helper that drivers can use to send vblank event after a pageflip.
If the driver doesn't support proper vblank irq based time/seqn then
just pass -1 for the pipe # to get do_gettimestamp() behavior (since
there are a lot of drivers that don't use drm_vblank_count_and_time())

Also an internal send_vblank_event() helper for the various other code
paths within drm_irq that also need to send vblank events.

v1: original
v2: add back 'vblwait->reply.sequence = seq' which should not have
    been deleted
v3: add WARN_ON() in case lock is not held and comments
v4: use WARN_ON_SMP() instead to fix issue with !SMP && !DEBUG_SPINLOCK
    as pointed out by Marcin Slusarz
v5: update docbook

Signed-off-by: Rob Clark <rob@ti.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm: tegra: Add HDMI support
Thierry Reding [Thu, 15 Nov 2012 21:28:23 +0000 (21:28 +0000)]
drm: tegra: Add HDMI support

This commit adds support for the HDMI output on the Tegra20 SoC. Only
one such output is available, but it can be driven by either of the two
display controllers.

A lot of work on this patch has been contributed by NVIDIA's Mark Zhang
<markz@nvidia.com> and many other people at NVIDIA were very helpful in
getting the HDMI support and surrounding infrastructure to work.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Tested-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Mark Zhang <markz@nvidia.com>
Reviewed-by: Mark Zhang <markz@nvidia.com>
Tested-by: Mark Zhang <markz@nvidia.com>
Tested-and-acked-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm: Add NVIDIA Tegra20 support
Thierry Reding [Thu, 15 Nov 2012 21:28:22 +0000 (21:28 +0000)]
drm: Add NVIDIA Tegra20 support

This commit adds a KMS driver for the Tegra20 SoC. This includes basic
support for host1x and the two display controllers found on the Tegra20
SoC. Each display controller can drive a separate RGB/LVDS output.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Tested-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Mark Zhang <markz@nvidia.com>
Reviewed-by: Mark Zhang <markz@nvidia.com>
Tested-by: Mark Zhang <markz@nvidia.com>
Tested-and-acked-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/udl: Add missing static storage class specifiers in udl_connector.c
Sachin Kamat [Mon, 19 Nov 2012 05:27:43 +0000 (05:27 +0000)]
drm/udl: Add missing static storage class specifiers in udl_connector.c

Fixes the following sparse warnings:
drivers/gpu/drm/udl/udl_connector.c:80:20: warning:
symbol 'udl_best_single_encoder' was not declared. Should it be static?
drivers/gpu/drm/udl/udl_connector.c:93:5: warning:
symbol 'udl_connector_set_property' was not declared. Should it be static?
drivers/gpu/drm/udl/udl_connector.c:106:35: warning:
symbol 'udl_connector_helper_funcs' was not declared. Should it be static?
drivers/gpu/drm/udl/udl_connector.c:112:28: warning:
symbol 'udl_connector_funcs' was not declared. Should it be static?

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/drm_stub: Remove unnecessary null check before kfree.
Sachin Kamat [Mon, 19 Nov 2012 09:44:59 +0000 (09:44 +0000)]
drm/drm_stub: Remove unnecessary null check before kfree.

kfree on a null argument is a no-op.
Silences the following smatch warning:
drivers/gpu/drm/drm_stub.c:496 drm_put_dev() info:
redundant null check on dev->devname calling kfree()

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/fb_helper: Fix potential NULL pointer dereference
Sachin Kamat [Mon, 19 Nov 2012 09:44:58 +0000 (09:44 +0000)]
drm/fb_helper: Fix potential NULL pointer dereference

kcalloc returns NULL on failure. Hence check for the return value
and exit on error to avoid NULL pointer dereference.

Fixes the following smatch errors:
drivers/gpu/drm/drm_fb_helper.c:1271 drm_setup_crtcs() error:
potential null dereference 'modes'.  (kcalloc returns null)
drivers/gpu/drm/drm_fb_helper.c:1272 drm_setup_crtcs() error:
potential null dereference 'crtcs'.  (kcalloc returns null)

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/crtc: Fix potential NULL pointer dereference
Sachin Kamat [Mon, 19 Nov 2012 09:44:57 +0000 (09:44 +0000)]
drm/crtc: Fix potential NULL pointer dereference

drm_property_create_blob() could return NULL in which case NULL pointer
dereference error (on connector->edid_blob_ptr) is possible. Return if
connector->edid_blob_ptr is NULL.

Fixes the following smatch error:
drivers/gpu/drm/drm_crtc.c:3186 drm_mode_connector_update_edid_property()
error: potential null dereference 'connector->edid_blob_ptr'.
(drm_property_create_blob returns null)

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/crtc: Remove redundant NULL check before kfree
Sachin Kamat [Mon, 19 Nov 2012 09:44:56 +0000 (09:44 +0000)]
drm/crtc: Remove redundant NULL check before kfree

kfree() on a NULL input is a no-op. Hence remove the check.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm: Reject addfb2 with undefined flag bits set
Ville Syrjälä [Thu, 8 Nov 2012 09:09:42 +0000 (09:09 +0000)]
drm: Reject addfb2 with undefined flag bits set

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm: fix documentation for drm_crtc_set_mode()
Alex Deucher [Fri, 9 Nov 2012 17:26:32 +0000 (17:26 +0000)]
drm: fix documentation for drm_crtc_set_mode()

x and y parameters are offsets, not width/height

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm: get cea video id code for a given display mode
Stephane Marchesin [Fri, 9 Nov 2012 16:21:05 +0000 (16:21 +0000)]
drm: get cea video id code for a given display mode

This patch adds support for getting CEA Video ID Code for a given
display mode after matching with edid_cea_modes list. Its index in
the list added with one, gives the desired code.

This exported function will be used by hdmi drivers for composing
AVI info frame data.

Signed-off-by: Stephane Marchesin <marcheu@chromium.org>
Signed-off-by: Rahul Sharma <rahul.sharma@samsung.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/drm_fb_helper: Remove unnecessary braces
Sachin Kamat [Thu, 15 Nov 2012 03:43:30 +0000 (03:43 +0000)]
drm/drm_fb_helper: Remove unnecessary braces

Remove unnecessary braces to silence the following type of
checkpatch warnings:
WARNING: braces {} are not necessary for single statement blocks
WARNING: braces {} are not necessary for any arm of this statement

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/fb_helper: Convert printk to pr_* and dev_*
Sachin Kamat [Thu, 15 Nov 2012 03:43:29 +0000 (03:43 +0000)]
drm/fb_helper: Convert printk to pr_* and dev_*

Converted printks to pr_* and dev_* to silence checkpatch warnings.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/fb_helper: Fix checkpatch errors
Sachin Kamat [Thu, 15 Nov 2012 03:43:28 +0000 (03:43 +0000)]
drm/fb_helper: Fix checkpatch errors

Fixes the following checkpatch errors:
ERROR: trailing statements should be on next line
98: FILE: gpu/drm/drm_fb_helper.c:98:
case DRM_FORCE_OFF: s = "OFF"; break;
ERROR: trailing statements should be on next line
99: FILE: gpu/drm/drm_fb_helper.c:99:
case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break;
ERROR: trailing statements should be on next line
101: FILE: gpu/drm/drm_fb_helper.c:101:
case DRM_FORCE_ON: s = "ON"; break;

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm: fix returning -EINVAL on setmaster if another master is active
David Herrmann [Thu, 15 Nov 2012 13:04:37 +0000 (13:04 +0000)]
drm: fix returning -EINVAL on setmaster if another master is active

We link every DRM "file_priv" to a "drm_master" structure. Currently, the
drmSetMaster() call returns 0 when there is _any_ active master associated
with the "drm_master" structure of the calling "file_priv". This means,
that after drmSetMaster() we are not guaranteed to be DRM-Master and might
not be able to perform mode-setting.

A way to reproduce this is by starting weston with the DRM backend from
within an X-console (eg., xterm). Because the xserver's "drm_master" is
currently active, weston is assigned to the same master but is inactive
because its VT is inactive and the xserver is still active. But when
"fake-activating" weston, it calls drmSetMaster(). With current behavior
this returns "0/success" and weston thinks that it is DRM-Master, even
though it is not (as the xserver is still DRM-Master).
Expected behavior would be drmSetMaster() to return -EINVAL, because the
xserver is still DRM-Master. This patch changes exactly that.

The only way this bogus behavior would be useful is for clients to check
whether their associated "drm_master" is currently the active DRM-Master.
But this logic fails if no DRM-Master is currently active at all. Because
then the client itself would become DRM-Master (if it is root) and this
makes this whole thing useles.

Also note that the second "if-condition":
  file_priv->minor->master != file_priv->master
is always true and can be skipped.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agoMerge branch 'for-airlied' of git://people.freedesktop.org/~danvet/drm-intel into...
Dave Airlie [Mon, 19 Nov 2012 23:22:35 +0000 (09:22 +1000)]
Merge branch 'for-airlied' of git://people.freedesktop.org/~danvet/drm-intel into drm-next

Daniel writes:
Highlights of this -next round:
- ivb fdi B/C fixes
- hsw sprite/plane offset fixes from Damien
- unified dp/hdmi encoder for hsw, finally external dp support on hsw
  (Paulo)
- kill-agp and some other prep work in the gtt code from Ben
- some fb handling fixes from Ville
- massive pile of patches to align hsw VGA with the spec and make it
  actually work (Paulo)
- pile of workarounds from Jesse, mostly for vlv, but also some other
  related platforms
- start of a dev_priv reorg, that thing grew out of bounds and chaotic
- small bits&pieces all over the place, down to better error handling for
  load-detect on gen2 (Chris, Jani, Mika, Zhenyu, ...)

On top of the previous pile (just copypasta):
- tons of hsw dp prep patches form Paulo
- round scheduled work items and timers to nearest second (Chris)
- some hw workarounds (Jesse&Damien)
- vlv dp support and related fixups (Vijay et al.)
- basic haswell dp support, not yet wired up for external ports (Paulo)
- edp support (Paulo)
- tons of refactorings to prepare for the above (Paulo)
- panel rework, unifiying code between lvds and edp panels (Jani)
- panel fitter scaling modes (Jani + Yuly Novikov)
- panel power improvements, should now work without the BIOS setting it up
- extracting some dp helpers from radeon/i915 and move them to
  drm_dp_helper.c
- randome pile of workarounds (Damien, Ben, ...)
- some cleanups for the register restore code for suspend/resume
- secure batchbuffer support, should enable tear-free blits on gen6+
  Chris)
- random smaller fixlets and cleanups.

* 'for-airlied' of git://people.freedesktop.org/~danvet/drm-intel: (231 commits)
  drm/i915: Restore physical HWS_PGA after resume
  drm/i915: Report amount of usable graphics memory in MiB
  drm/i915/i2c: Track users of GMBUS force-bit
  drm/i915: Allocate the proper size for contexts.
  drm/i915: Update load-detect failure paths for modeset-rework
  drm/i915: Clear unused fields of mode for framebuffer creation
  drm/i915: Always calculate 8xx WM values based on a 32-bpp framebuffer
  drm/i915: Fix sparse warnings in from AGP kill code
  drm/i915: Missed lock change with rps lock
  drm/i915: Move the remaining gtt code
  drm/i915: flush system agent TLBs on SNB
  drm/i915: Kill off now unused gen6+ AGP code
  drm/i915: Calculate correct stolen size for GEN7+
  drm/i915: Stop using AGP layer for GEN6+
  drm/i915: drop the double-OP_STOREDW usage in blt_ring_flush
  drm/i915: don't rewrite the GTT on resume v4
  drm/i915: protect RPS/RC6 related accesses (including PCU) with a new mutex
  drm/i915: put ring frequency and turbo setup into a work queue v5
  drm/i915: don't block resume on fb console resume v2
  drm/i915: extract l3_parity substruct from dev_priv
  ...

12 years agodrm/i915: Restore physical HWS_PGA after resume
Chris Wilson [Fri, 16 Nov 2012 11:43:20 +0000 (11:43 +0000)]
drm/i915: Restore physical HWS_PGA after resume

By always setting up the HWS register for both physical and virtual
address variations during render ring we can reduce the number of
different special cases that get set up at varying different times
during module load.

Fixes regression from

commit c630119f43471a8ece356b01dabf07f944f453b3
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed Oct 17 11:32:57 2012 +0200

    drm/i915: don't save/restore HWS_PGA reg for kms

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: Report amount of usable graphics memory in MiB
Chris Wilson [Sun, 11 Nov 2012 09:34:45 +0000 (09:34 +0000)]
drm/i915: Report amount of usable graphics memory in MiB

...rather than kilo-PTE.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
[danvet: Apply s/Usabel/usable/ bikeshed suggested by Ben Widawsky.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915/i2c: Track users of GMBUS force-bit
Chris Wilson [Sat, 10 Nov 2012 15:58:21 +0000 (15:58 +0000)]
drm/i915/i2c: Track users of GMBUS force-bit

This fixes a regression for SDVO from

commit fbfcc4f3a0cf8bbde87646b74241faa8e37426bf
Author: Jani Nikula <jani.nikula@intel.com>
Date:   Mon Oct 22 16:12:18 2012 +0300

    drm/i915/sdvo: restore i2c adapter config on intel_sdvo_init() failures

As SDVOB and SDVOC are multiplexed on the same pin, if a chipset does
not have the second SDVO encoder, it will then remove the force-bit
setting on the common i2c adapter during teardown. All subsequent
attempts of trying to use GMBUS with SDVOB then fail.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
[danvet: fixup inversion in the debug printout, noticed by Jani
Nikulai.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: Allocate the proper size for contexts.
Ben Widawsky [Sat, 10 Nov 2012 18:56:04 +0000 (10:56 -0800)]
drm/i915: Allocate the proper size for contexts.

Whoops. This was fixed previously, but not sure how it got lost. It's
not needed for -fixes or stable because at the moment
drm_i915_file_private is way bigger than i915_hw_context (by 120 bytes
on my 64b build).

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: Update load-detect failure paths for modeset-rework
Chris Wilson [Mon, 5 Nov 2012 22:25:08 +0000 (22:25 +0000)]
drm/i915: Update load-detect failure paths for modeset-rework

After the rework, intel_set_mode() became a little better behaved in
restoring the current mode if we failed to apply the requested modeline.
However, the failure path for load-detect would clobber the existing
state, leading to an oops during BIOS takeover on older machines.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: Clear unused fields of mode for framebuffer creation
Chris Wilson [Mon, 5 Nov 2012 22:25:07 +0000 (22:25 +0000)]
drm/i915: Clear unused fields of mode for framebuffer creation

With the stricter checks introduced in
commit ac911edae5960d7dccd9883f5fa5d25b591520de
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date:   Wed Oct 31 17:50:19 2012 +0200

    drm/i915: Check the framebuffer offset

(and friends), it became especially prudent to make sure that the
additional fields inside the mode were cleared before attempting to
create a framebuffer. In particular, the fb created for load detection
failed to do so and hence failed.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: Always calculate 8xx WM values based on a 32-bpp framebuffer
Chris Wilson [Mon, 22 Oct 2012 11:32:15 +0000 (12:32 +0100)]
drm/i915: Always calculate 8xx WM values based on a 32-bpp framebuffer

The specs for gen2 say that the watermark values "should always be set
assuming a 32bpp display mode, even though the display mode may be 15 or
16 bpp."

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: Fix sparse warnings in from AGP kill code
Ben Widawsky [Tue, 6 Nov 2012 09:50:16 +0000 (09:50 +0000)]
drm/i915: Fix sparse warnings in from AGP kill code

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: Missed lock change with rps lock
Ben Widawsky [Tue, 6 Nov 2012 14:36:36 +0000 (14:36 +0000)]
drm/i915: Missed lock change with rps lock

Fixes a WARN_ON in igt/tests/debugfs_reader

CC: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: Move the remaining gtt code
Ben Widawsky [Sun, 4 Nov 2012 17:21:31 +0000 (09:21 -0800)]
drm/i915: Move the remaining gtt code

It's pretty much all consolidated now that we've killed AGP. We can move
the one outlier, and defines too.

(Kill some unused defines in the process)

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: flush system agent TLBs on SNB
Ben Widawsky [Sun, 4 Nov 2012 17:21:30 +0000 (09:21 -0800)]
drm/i915: flush system agent TLBs on SNB

This allows us to map the PTEs WC. I've not done thorough testing or
performance measurements with this patch, but it should be decent.

This is based on a patch from Jesse with the original commit message
> I've only lightly tested this so far, but the corruption seems to be
> gone if I write the GFX_FLSH_CNTL reg after binding an object.  This
> register should control the TLB for the system agent, which is what CPU
> mapped objects will go through.

It has been updated for the new AGP-less code by me, and included with
it is feedback from the original patch.

v2: Updated to reflect paranoia on pte updates/register posting reads.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by [v1]: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: Kill off now unused gen6+ AGP code
Ben Widawsky [Sun, 4 Nov 2012 17:21:29 +0000 (09:21 -0800)]
drm/i915: Kill off now unused gen6+ AGP code

v2: Accidently removed an ILK case in i9xx_setup (Nicely found by Chris)

CC: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by [v1] : Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: Calculate correct stolen size for GEN7+
Ben Widawsky [Sun, 4 Nov 2012 17:21:28 +0000 (09:21 -0800)]
drm/i915: Calculate correct stolen size for GEN7+

This bug existed in the old code, but was easier to fix here in the
rework. Unfortunately gen7 doesn't have a nice way to figure out the
size and we must use a lookup table.

As Jesse pointed out, there is some confusion in the docs about these
definitions. We're picking the one which seems more accurate, but we
really aren't certain.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: Stop using AGP layer for GEN6+
Ben Widawsky [Sun, 4 Nov 2012 17:21:27 +0000 (09:21 -0800)]
drm/i915: Stop using AGP layer for GEN6+

As a quick hack we make the old intel_gtt structure mutable so we can
fool a bunch of the existing code which depends on elements in that data
structure. We can/should try to remove this in a subsequent patch.

This should preserve the old gtt init behavior which upon writing these
patches seems incorrect. The next patch will fix these things.

The one exception is VLV which doesn't have the preserved flush control
write behavior. Since we want to do that for all GEN6+ stuff, we'll
handle that in a later patch. Mainstream VLV support doesn't actually
exist yet anyway.

v2: Update the comment to remove the "voodoo"
Check that the last pte written matches what we readback

v3: actually kill cache_level_to_agp_type since most of the flags will
disappear in an upcoming patch

v4: v3 was actually not what we wanted (Daniel)
Make the ggtt bind assertions better and stricter (Chris)
Fix some uncaught errors at gtt init (Chris)
Some other random stuff that Chris wanted

v5: check for i==0 in gen6_ggtt_bind_object to shut up gcc (Ben)

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by [v4]: Chris Wilson <chris@chris-wilson.co.uk>
[danvet: Make the cache_level -> agp_flags conversion for pre-gen6 a
tad more robust by mapping everything != CACHE_NONE to the cached agp
flag - we have a 1:1 uncached mapping, but different modes of
cacheable (at least on later generations). Suggested by Chris Wilson.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: drop the double-OP_STOREDW usage in blt_ring_flush
Daniel Vetter [Sun, 4 Nov 2012 11:24:47 +0000 (12:24 +0100)]
drm/i915: drop the double-OP_STOREDW usage in blt_ring_flush

This has been introduced in "drm/i915: TLB invalidation with
MI_FLUSH_DW requires a post-sync op".

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Reported-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: don't rewrite the GTT on resume v4
Jesse Barnes [Fri, 2 Nov 2012 18:14:02 +0000 (11:14 -0700)]
drm/i915: don't rewrite the GTT on resume v4

The BIOS shouldn't be touching this memory across suspend/resume, so
just leave it alone.  This saves us ~6ms on resume on my T420 (retested
with write combined PTEs).

v2: change gtt restore default on pre-gen4 (Chris)
    move needs_gtt_restore flag into dev_priv
v3: make sure we restore GTT on resume from hibernate (Daniel)
    use opregion support as the cutoff for restore from resume (Chris)
v4: use a better check for opregion (Chris)

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[danvet: Kill the needs_gtt_restore indirection and check directly for
OpRegion. Also explain in a comment what's going on.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: protect RPS/RC6 related accesses (including PCU) with a new mutex
Jesse Barnes [Fri, 2 Nov 2012 18:14:01 +0000 (11:14 -0700)]
drm/i915: protect RPS/RC6 related accesses (including PCU) with a new mutex

This allows the power related code to run independently of the rest of
the pipeline, extending the resume and init time improvements into
userspace, which would otherwise have been blocked on the struct mutex
if we were doing PCU communication.

v2: Also convert the locking for the rps sysfs interface.

Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> (v1)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: put ring frequency and turbo setup into a work queue v5
Jesse Barnes [Fri, 2 Nov 2012 18:14:00 +0000 (11:14 -0700)]
drm/i915: put ring frequency and turbo setup into a work queue v5

Communicating via the mailbox registers with the PCU can take quite
awhile.  And updating the ring frequency or enabling turbo is not
something that needs to happen synchronously, so take it out of our init
and resume paths to speed things up (~200ms on my T420).

v2: add comment about why we use a work queue (Daniel)
    make sure work queue is idle on suspend (Daniel)
    use a delayed work queue since there's no hurry (Daniel)
v3: make cleanup symmetric and just call cancel work directly (Daniel)
v4: schedule the work using round_jiffies_up to batch work better (Chris)
v5: fix the right schedule_delayed_work call (Chris)

References: https://bugs.freedesktop.org/show_bug.cgi?id=54089

Signed-of-by: Jesse Barnes <jbarnes@virtuougseek.org>
[danvet: bikeshed the placement of the new delayed work, move it to
all the other gen6 power mgmt stuff.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: don't block resume on fb console resume v2
Jesse Barnes [Fri, 2 Nov 2012 18:13:59 +0000 (11:13 -0700)]
drm/i915: don't block resume on fb console resume v2

The console lock can be contended, so rather than prevent other drivers
after us from being held up, queue the console suspend into the global
work queue that can happen anytime.  I've measured this to take around
200ms on my T420.  Combined with the ring freq/turbo change, we should
save almost 1/2 a second on resume.

v2: use console_trylock() to try to resume the console immediately (Chris)

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[danvet: move dev_priv->console_resume_work next to the fbdev
pointer.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: extract l3_parity substruct from dev_priv
Daniel Vetter [Fri, 2 Nov 2012 18:55:07 +0000 (19:55 +0100)]
drm/i915: extract l3_parity substruct from dev_priv

Pretty astonishing how far apart these two members landed ... Especially since
I've already removed almost 200 lines in between.

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: move dri1 dungeon out of dev_priv
Daniel Vetter [Fri, 2 Nov 2012 18:55:05 +0000 (19:55 +0100)]
drm/i915: move dri1 dungeon out of dev_priv

Also, move dev_priv->counter there, it's only used in i915_dma.c

And also move the dri1 dungeon at the end of dev_priv where no one
cares about it.

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: move pwrctx/renderctx to the other ilk power state
Daniel Vetter [Fri, 2 Nov 2012 18:55:04 +0000 (19:55 +0100)]
drm/i915: move pwrctx/renderctx to the other ilk power state

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: move dev_priv->(rps|ips) out of line
Daniel Vetter [Fri, 2 Nov 2012 18:55:03 +0000 (19:55 +0100)]
drm/i915: move dev_priv->(rps|ips) out of line

And give the structs slightly more generic names. I've decided to keep
the short rps/ips prefix, since that's just easier and less churn.

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: move the suspend/resume register file out of dev_priv
Daniel Vetter [Fri, 2 Nov 2012 18:55:02 +0000 (19:55 +0100)]
drm/i915: move the suspend/resume register file out of dev_priv

dev_priv has grown way too big, and grouping memebers into substructs
and moving them out of line helps re-gain some overview.

Unfortunatley I couldn't just call the substruct save and drop the prefix, since
that will make most member names clash with registers #defines. Changes in
i915_drv.h done by hand, everything else changed with
s/\<save\([A-Z]*\)/regfile.save\1/ in vim.

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: add clock gating regs to VLV offset check function
Jesse Barnes [Thu, 25 Oct 2012 19:15:48 +0000 (12:15 -0700)]
drm/i915: add clock gating regs to VLV offset check function

So we can write them properly.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Antti Koskipää <antti.koskipaa@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: PIPE_CONTROL TLB invalidate requires CS stall
Jesse Barnes [Thu, 25 Oct 2012 19:15:47 +0000 (12:15 -0700)]
drm/i915: PIPE_CONTROL TLB invalidate requires CS stall

"If ENABLED, PIPE_CONTROL command will flush the in flight data  written
out by render engine to Global Observation point on flush done. Also
Requires stall bit ([20] of DW1) set."

So set the stall bit to ensure proper invalidation.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Antti Koskipää <antti.koskipaa@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: TLB invalidation with MI_FLUSH_DW requires a post-sync op v3
Jesse Barnes [Fri, 26 Oct 2012 16:42:42 +0000 (09:42 -0700)]
drm/i915: TLB invalidation with MI_FLUSH_DW requires a post-sync op v3

So store into the scratch space of the HWS to make sure the invalidate
occurs.

v2: use GTT address space for store, clean up #defines (Chris)
v3: use correct #define in blt ring flush (Chris)

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Antti Koskipää <antti.koskipaa@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
References: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1063252
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: implement WaDisablePSDDualDispatchEnable on IVB & VLV
Jesse Barnes [Thu, 25 Oct 2012 19:15:45 +0000 (12:15 -0700)]
drm/i915: implement WaDisablePSDDualDispatchEnable on IVB & VLV

Workaround for dual port PS dispatch on GT1.

v2: pull in register definition & offset handling
v3: use IVB GT1 macro to get the right regs (Ben)
v4: add for VLV too (Ben)
v5: don't read the reg, it's masked so we'll only enable the one extra bit (Chris)
v6: use a _GT2 suffix for the second reg (Chris)

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Antti Koskipää <antti.koskipaa@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: implement WaDisableVLVClockGating_VBIIssue on VLV
Jesse Barnes [Thu, 25 Oct 2012 19:15:44 +0000 (12:15 -0700)]
drm/i915: implement WaDisableVLVClockGating_VBIIssue on VLV

This allows us to get the right vblank interrupt frequency.

v2: pull in register definition

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Antti Koskipää <antti.koskipaa@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: implement WaForceL3Serialization on VLV and IVB
Jesse Barnes [Thu, 25 Oct 2012 19:15:43 +0000 (12:15 -0700)]
drm/i915: implement WaForceL3Serialization on VLV and IVB

References: https://bugs.freedesktop.org/show_bug.cgi?id=50250
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Antti Koskipää <antti.koskipaa@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: implement WaDisableDopClockGatingisable on VLV and IVB
Jesse Barnes [Thu, 25 Oct 2012 19:15:42 +0000 (12:15 -0700)]
drm/i915: implement WaDisableDopClockGatingisable on VLV and IVB

v2: use correct register
v3: remove extra hunks, pull in register definitions & offset check directly
v4: add GT1 vs GT2 distinction for IVB portion (Ben)

References: https://bugs.freedesktop.org/show_bug.cgi?id=50233
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Antti Koskipää <antti.koskipaa@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: implement WaDisableL3CacheAging on VLV
Jesse Barnes [Thu, 25 Oct 2012 19:15:41 +0000 (12:15 -0700)]
drm/i915: implement WaDisableL3CacheAging on VLV

Needs to be set on every context restore as well, so set it as part of
the initial state so we can save/restore it.  Note this removes the IVB
workaround value from VLV and uses the default value, just adding in the
L3 cache aging disable bit, since the IVB value is wrong for VLV.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Antti Koskipää <antti.koskipaa@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: fix Haswell FDI link disable path
Paulo Zanoni [Thu, 1 Nov 2012 23:05:05 +0000 (21:05 -0200)]
drm/i915: fix Haswell FDI link disable path

This covers the "Disable FDI" section from the CRT mode set sequence.
This disables the FDI receiver and also the FDI pll.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: fix Haswell FDI link training code
Paulo Zanoni [Thu, 1 Nov 2012 23:00:59 +0000 (21:00 -0200)]
drm/i915: fix Haswell FDI link training code

This commit makes hsw_fdi_link_train responsible for implementing
everything described in the "Enable and train FDI" section from the
Hawell CRT mode set sequence documentation. We completely rewrite
hsw_fdi_link_train to match the documentation and we also call it in
the right place.

This patch was initially sent as a series of tiny patches fixing every
little problem of the function, but since there were too many patches
fixing the same function it got a little difficult to get the "big
picture" of how the function would be in the end, so here we amended
all the patches into a single big patch fixing the whole function.

Problems we fixed:

  1 - Train Haswell FDI at the right time.

    We need to train the FDI before enabling the pipes and planes, so
    we're moving the call from lpt_pch_enable to haswell_crtc_enable
    directly.

    We are also removing ironlake_fdi_pll_enable since the PLL
    enablement on Haswell is completely different and is also done
    during the link training steps.

  2 - Use the right FDI_RX_CTL register on Haswell

    There is only one PCH transcoder, so it's always _FDI_RXA_CTL.
    Using "pipe" here is wrong.

  3 - Don't rely on DDI_BUF_CTL previous values

    Just set the bits we want, everything else is zero. Also
    POSTING_READ the register before sleeping.

  4 - Program the FDI RX TUSIZE register on hsw_fdi_link_train

    According to the mode set sequence documentation, this is the
    right place. According to the FDI_RX_TUSIZE register description,
    this is the value we should set.

    Also remove the code that sets this register from the old
    location: lpt_pch_enable.

  5 - Properly program FDI_RX_MISC pwrdn lane values on HSW

  6 - Wait only 35us for the FDI link training

    First we wait 30us for the FDI receiver lane calibration, then we
    wait 5us for the FDI auto training time.

  7 - Remove an useless indentation level on hsw_fdi_link_train

    We already "break" when the link training succeeds.

  8 - Disable FDI_RX_ENABLE, not FDI_RX_PLL_ENABLE

    When we fail the training.

  9 - Change Haswell FDI link training error messages

    We shouldn't call DRM_ERROR when still looping through voltage
    levels since this is expected and not really a failure. So in this
    commit we adjust the error path to only DRM_ERROR when we really
    fail after trying everything.

    While at it, replace DRM_DEBUG_DRIVER with DRM_DEBUG_KMS since
    it's what we use everywhere.

  10 - Try each voltage twice at hsw_fdi_link_train

    Now with Daniel Vetter's suggestion to use "/2" instead of ">>1".

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
[danvet: Applied tiny bikesheds:
- mention in comment that we test each voltage/emphasis level twice
- realing arguments of the only untouched reg write, it spilled over
  the 80 char limit ...]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: remove HAS_eDP as unnecessary and inconsistent indirection
Jani Nikula [Fri, 2 Nov 2012 09:24:03 +0000 (11:24 +0200)]
drm/i915: remove HAS_eDP as unnecessary and inconsistent indirection

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: set the correct number of FDI lanes on Haswell
Paulo Zanoni [Thu, 1 Nov 2012 20:45:04 +0000 (18:45 -0200)]
drm/i915: set the correct number of FDI lanes on Haswell

We had 2 places using X2 and one place using X1.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: kill pch_init_clock_gating indirection
Daniel Vetter [Wed, 31 Oct 2012 21:52:31 +0000 (22:52 +0100)]
drm/i915: kill pch_init_clock_gating indirection

Now that we no longer pretend to have flexibility in matching any
north display block with any pch, we can ditch this.

v2: Fix the embarassing rebase fail that Paulo Zanoni spotted.

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: implement WADP0ClockGatingDisable
Daniel Vetter [Wed, 31 Oct 2012 21:52:30 +0000 (22:52 +0100)]
drm/i915: implement WADP0ClockGatingDisable

Found in Bspec vol4h South Display Engine Registers [CPT, PPT],
section "5.3.1  TRANS_CHICKEN_1—Transcoder Chicken Bits 1"

v2: Make it compile.

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
12 years agodrm/i915: CPT+ pch transcoder workaround
Daniel Vetter [Thu, 1 Nov 2012 08:15:30 +0000 (09:15 +0100)]
drm/i915: CPT+ pch transcoder workaround

We need to set the timing override chicken bit after fdi link training
has completed and before we enable the transcoder. We also have to
clear that bit again after disabling the pch transcoder.

See "Graphics BSpec: vol4g North Display Engine Registers [IVB],
Display Mode Set Sequence" and "Graphics BSpec: vol4h South Display
Engine Registers [CPT, PPT], South Display Engine Transcoder and FDI
Control, Transcoder Debug and DFT, TRANS_CHICKEN_2" bit 31:

"Workaround : Enable the override prior to enabling the transcoder.
Disable the override after disabling the transcoder."

While at it, use the _PIPE macro for the other TRANS_DP register.

v2: Keep the w/a as-is, but kill the original (but wrongly placed)
workaround introduced in

commit 3bcf603f6d5d18bd9d076dc280de71f48add4101
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date:   Wed Jul 27 11:51:40 2011 -0700

    drm/i915: apply timing generator bug workaround on CPT and PPT

and

commit d4270e57efe9e2536798c59e1ed2fd0a1e5cdfcf
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date:   Tue Oct 11 10:43:02 2011 -0700

    drm/i915: export a CPT mode set verification function

Note that this old code has unconditionally set the w/a, which might
explain why fdi link training sometimes silently fails, and especially
why the auto-train did not seem to work properly.

v3: Paulo Zanoni pointed out that this workaround is also required on
the LPT PCH. And Arthur Ranyan confirmed that this workaround is
requierd for all ports on the pch, not just DP: The important part
is that the bit is set whenever the pch transcoder is enabled, and
that it is _not_ set while the fdi link is trained. It is also
important that the pch transcoder is fully disabled, i.e. we have to
wait for bit 30 to clear before clearing the w/a bit.

Hence move to workaround into enable/disable_transcoder, where the pch
transcoder gets enabled/disabled.

v4: Whitespace changes dropped.

v5: Don't run the w/a on IBX, we only need it on CPT/PPT and LPT.

v6:
- resolve conflicts with Paulo's big hsw vga rework
- s/!IBX/CPT since hsw paths are now all separate, and Paulo's patch
  to implement the equivalent w/a for LPT is already merged.

Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Paulo Zanoni <przanoni@gmail.com>
Cc: Arthur Ranyan <arthur.j.runyan@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com> (v5)
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> (v5)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>