drm/i915: Re-enable GGTT earlier during resume on pre-gen6 platforms

Move the intel_enable_gtt() call to happen before we touch the GTT
during resume. Right now it's done way too late. Before
commit ebb7c78d358b ("agp/intel-gtt: Only register fake agp driver for gen1")
it was actually done earlier on account of also getting called from
the resume hook of the fake agp driver. With the fake agp driver
no longer getting registered we must move the call up.

The symptoms I've seen on my 830 machine include lowmem corruption,
other kinds of memory corruption, and straight up hung machine during
or just after resume. Not really sure what causes the memory corruption,
but so far I've not seen any with this fix.

I think we shouldn't really need to call this during init, but we have
been doing that so I've decided to keep the call. However moving that
call earlier could be prudent as well. Doing it right after the
intel-gtt probe seems appropriate.

Also tested this on 946gz,elk,ilk and all seemed quite happy with
this change.

v2: Reorder init_hw vs. enable_hw functions (Chris)

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: drm-intel-fixes@lists.freedesktop.org
Fixes: ebb7c78d358b ("agp/intel-gtt: Only register fake agp driver for gen1")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1462559755-353-1-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 46ac1da64a0927f8f039147698a01ba7e222d397..4e7ee25b8d3ef4fdd564e943aefce4553120e1de 100644 (file)
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1235,6 +1235,12 @@ static int i915_driver_init_hw(struct drm_i915_private *dev_priv)
        if (ret)
                return ret;
 
+       ret = i915_ggtt_enable_hw(dev);
+       if (ret) {
+               DRM_ERROR("failed to enable GGTT\n");
+               goto out_ggtt;
+       }
+
        /* WARNING: Apparently we must kick fbdev drivers before vgacon,
         * otherwise the vga fbdev driver falls over. */
        ret = i915_kick_out_firmware_fb(dev_priv);

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index a116730c39aacedb0bea149db830e6fd05749d12..a4cae74d86d8f43ba722032fb4a469c5cb7e5a15 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -730,9 +730,14 @@ int i915_suspend_switcheroo(struct drm_device *dev, pm_message_t state)
 static int i915_drm_resume(struct drm_device *dev)
 {
        struct drm_i915_private *dev_priv = dev->dev_private;
+       int ret;
 
        disable_rpm_wakeref_asserts(dev_priv);
 
+       ret = i915_ggtt_enable_hw(dev);
+       if (ret)
+               DRM_ERROR("failed to re-enable GGTT\n");
+
        intel_csr_ucode_resume(dev_priv);
 
        mutex_lock(&dev->struct_mutex);

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index d986a3598827121495892a79b6427337b1ee90ba..d2195c7f78b5a03aa9aa64d502799c3175eff579 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4821,9 +4821,6 @@ i915_gem_init_hw(struct drm_device *dev)
        struct intel_engine_cs *engine;
        int ret;
 
-       if (INTEL_INFO(dev)->gen < 6 && !intel_enable_gtt())
-               return -EIO;
-
        /* Double layer security blanket, see i915_gem_init() */
        intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
 

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 667f0e8596710137792fb45e9a39a53e4844245b..52f950b6adda9eacb09b98a68123da7eafb90f6b 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -3232,6 +3232,14 @@ out_gtt_cleanup:
        return ret;
 }
 
+int i915_ggtt_enable_hw(struct drm_device *dev)
+{
+       if (INTEL_INFO(dev)->gen < 6 && !intel_enable_gtt())
+               return -EIO;
+
+       return 0;
+}
+
 void i915_gem_restore_gtt_mappings(struct drm_device *dev)
 {
        struct drm_i915_private *dev_priv = to_i915(dev);

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index 18af3af18754364fd470c59baca872541f58f31f..35ff958f9de6ae0607bdb3e8d16f1e733a342fe4 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -517,6 +517,7 @@ i915_page_dir_dma_addr(const struct i915_hw_ppgtt *ppgtt, const unsigned n)
 }
 
 int i915_ggtt_init_hw(struct drm_device *dev);
+int i915_ggtt_enable_hw(struct drm_device *dev);
 void i915_gem_init_ggtt(struct drm_device *dev);
 void i915_ggtt_cleanup_hw(struct drm_device *dev);