drm/i915: add TRANSCODER_EDP

Before Haswell we used to have the CPU pipes and the PCH transcoders.
We had the same amount of pipes and transcoders, and there was a 1:1
mapping between them. After Haswell what we used to call CPU pipe was
split into CPU pipe and CPU transcoder. So now we have 3 CPU pipes (A,
B and C), 4 CPU transcoders (A, B, C and EDP) and 1 PCH transcoder
(only used for VGA).

For all the outputs except for EDP we have an 1:1 mapping on the CPU
pipes and CPU transcoders, so if you're using CPU pipe A you have to
use CPU transcoder A. When have an eDP output you have to use
transcoder EDP and you can attach this CPU transcoder to any of the 3
CPU pipes. When using VGA you need to select a pair of matching CPU
pipes/transcoders (A/A, B/B, C/C) and you also need to enable/use the
PCH transcoder.

For now we're just creating the cpu_transcoder definitions and setting
cpu_transcoder to TRANSCODER_EDP on DDI eDP code, but none of the
registers was ported to use transcoder instead of pipe. The goal is to
keep the code backwards-compatible since on all cases except when
using eDP we must have pipe == cpu_transcoder.

V2: Comment the haswell_crtc_off chunk, suggested by Damien Lespiau
and Daniel Vetter.

We currently need the haswell_crtc_off chunk because TRANSCODER_EDP
can be used by any CRTC, so when you stop using it you have to stop
saying you're using it, otherwise you may have at some point 2 CRTCs
claiming they're using TRANSCODER_EDP (a disabled CRTC and an enabled
one), then the HW state readout code will get completely confused.

In other words:

Imagine the following case:
  xrandr --output eDP1 --auto --crtc 0
  xrandr --output eDP1 --off
  xrandr --output eDP1 --auto --crtc 2

After the last command you could get a "pipe A assertion failure
(expected off, current on)" because CRTC 0 still claims it's using
TRANSCODER_EDP, so the HW state readout function will read it
(through PIPECONF) and expect it to be off, when it's actually on
because it's being used by CRTC 2.

So when we make "intel_crtc->cpu_transcoder = intel_crtc->pipe" we
make sure we're pointing to our own original CRTC which is certainly
not used by any other CRTC.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 987af6f5e0c68988c37c5757fdbae533f69c921e..2fcf284869df3af3dac605c9f383e0e3a4614e76 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -58,6 +58,14 @@ enum pipe {
 };
 #define pipe_name(p) ((p) + 'A')
 
+enum transcoder {
+       TRANSCODER_A = 0,
+       TRANSCODER_B,
+       TRANSCODER_C,
+       TRANSCODER_EDP = 0xF,
+};
+#define transcoder_name(t) ((t) + 'A')
+
 enum plane {
        PLANE_A = 0,
        PLANE_B,

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index c7c4b96c66501c3f90c9fdea2bee2257e7d64792..598f83a298cf22349d11907f0e9fe7990efd86f3 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -26,6 +26,7 @@
 #define _I915_REG_H_
 
 #define _PIPE(pipe, a, b) ((a) + (pipe)*((b)-(a)))
+#define _TRANSCODER(tran, a, b) ((a) + (tran)*((b)-(a)))
 
 #define _PORT(port, a, b) ((a) + (port)*((b)-(a)))
 

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 1f02486e444cb1129616c020d71e6b07026e3f44..74e7625b19dc41744b6b3a2083a4fc43fcce1ca0 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -937,6 +937,15 @@ intel_vlv_find_best_pll(const intel_limit_t *limit, struct drm_crtc *crtc,
        return true;
 }
 
+enum transcoder intel_pipe_to_cpu_transcoder(struct drm_i915_private *dev_priv,
+                                            enum pipe pipe)
+{
+       struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
+       struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+
+       return intel_crtc->cpu_transcoder;
+}
+
 static void ironlake_wait_for_vblank(struct drm_device *dev, int pipe)
 {
        struct drm_i915_private *dev_priv = dev->dev_private;
@@ -3482,6 +3491,12 @@ static void ironlake_crtc_off(struct drm_crtc *crtc)
 
 static void haswell_crtc_off(struct drm_crtc *crtc)
 {
+       struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+
+       /* Stop saying we're using TRANSCODER_EDP because some other CRTC might
+        * start using it. */
+       intel_crtc->cpu_transcoder = intel_crtc->pipe;
+
        intel_ddi_put_crtc_pll(crtc);
 }
 
@@ -5358,6 +5373,11 @@ static int haswell_crtc_mode_set(struct drm_crtc *crtc,
                num_connectors++;
        }
 
+       if (is_cpu_edp)
+               intel_crtc->cpu_transcoder = TRANSCODER_EDP;
+       else
+               intel_crtc->cpu_transcoder = pipe;
+
        /* We are not sure yet this won't happen. */
        WARN(!HAS_PCH_LPT(dev), "Unexpected PCH type %d\n",
             INTEL_PCH_TYPE(dev));
@@ -7894,6 +7914,7 @@ static void intel_crtc_init(struct drm_device *dev, int pipe)
        /* Swap pipes & planes for FBC on pre-965 */
        intel_crtc->pipe = pipe;
        intel_crtc->plane = pipe;
+       intel_crtc->cpu_transcoder = pipe;
        if (IS_MOBILE(dev) && IS_GEN3(dev)) {
                DRM_DEBUG_KMS("swapping pipes & planes for FBC\n");
                intel_crtc->plane = !pipe;

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 4c7ae4f3ae3b1bf43f0c15febbd7b4e718e3081b..90e706c846a4685b93d4d6fa9e32163ccb512faf 100644 (file)
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -195,6 +195,7 @@ struct intel_crtc {
        struct drm_crtc base;
        enum pipe pipe;
        enum plane plane;
+       enum transcoder cpu_transcoder;
        u8 lut_r[256], lut_g[256], lut_b[256];
        /*
         * Whether the crtc and the connected output pipeline is active. Implies
@@ -505,6 +506,9 @@ extern struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
                                                    struct drm_crtc *crtc);
 int intel_get_pipe_from_crtc_id(struct drm_device *dev, void *data,
                                struct drm_file *file_priv);
+extern enum transcoder
+intel_pipe_to_cpu_transcoder(struct drm_i915_private *dev_priv,
+                            enum pipe pipe);
 extern void intel_wait_for_vblank(struct drm_device *dev, int pipe);
 extern void intel_wait_for_pipe_off(struct drm_device *dev, int pipe);