drm/i915: Add references to some workaround we implement

We did not mention the workaround name when implementing those. This
should help us track what we already implement.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_gem_context.c

@@ -333,6 +333,7 @@ mi_set_context(struct intel_ring_buffer *ring,
 	if (ret)
 		return ret;
 
+	/* WaProgramMiArbOnOffAroundMiSetContext:ivb,vlv,hsw */
 	if (IS_GEN7(ring->dev))
 		intel_ring_emit(ring, MI_ARB_ON_OFF | MI_ARB_DISABLE);
 	else

drivers/gpu/drm/i915/intel_ddi.c

@@ -174,6 +174,8 @@ void hsw_fdi_link_train(struct drm_crtc *crtc)
 	 * mode set "sequence for CRT port" document:
 	 * - TP1 to TP2 time with the default value
 	 * - FDI delay to 90h
+	 *
+	 * WaFDIAutoLinkSetTimingOverrride:hsw
 	 */
 	I915_WRITE(_FDI_RXA_MISC, FDI_RX_PWRDN_LANE1_VAL(2) |
 				  FDI_RX_PWRDN_LANE0_VAL(2) |

drivers/gpu/drm/i915/intel_display.c

@@ -4125,8 +4125,8 @@ static int intel_crtc_compute_config(struct drm_crtc *crtc,
 	if (!pipe_config->timings_set)
 		drm_mode_set_crtcinfo(adjusted_mode, 0);
 
-	/* WaPruneModeWithIncorrectHsyncOffset: Cantiga+ cannot handle modes
-	 * with a hsync front porch of 0.
+	/* Cantiga+ cannot handle modes with a hsync front porch of 0.
+	 * WaPruneModeWithIncorrectHsyncOffset:ctg,elk,ilk,snb,ivb,vlv,hsw.
 	 */
 	if ((INTEL_INFO(dev)->gen > 4 || IS_G4X(dev)) &&
 		adjusted_mode->hsync_start == adjusted_mode->hdisplay)

drivers/gpu/drm/i915/intel_pm.c

@@ -4586,6 +4586,7 @@ static void __gen6_gt_force_wake_get(struct drm_i915_private *dev_priv)
 			    FORCEWAKE_ACK_TIMEOUT_MS))
 		DRM_ERROR("Timed out waiting for forcewake to ack request.\n");
 
+	/* WaRsForcewakeWaitTC0:snb */
 	__gen6_gt_wait_for_thread_c0(dev_priv);
 }
 
@@ -4617,6 +4618,7 @@ static void __gen6_gt_force_wake_mt_get(struct drm_i915_private *dev_priv)
 			    FORCEWAKE_ACK_TIMEOUT_MS))
 		DRM_ERROR("Timed out waiting for forcewake to ack request.\n");
 
+	/* WaRsForcewakeWaitTC0:ivb,hsw */
 	__gen6_gt_wait_for_thread_c0(dev_priv);
 }
 
@@ -4720,6 +4722,7 @@ static void vlv_force_wake_get(struct drm_i915_private *dev_priv)
 			    FORCEWAKE_ACK_TIMEOUT_MS))
 		DRM_ERROR("Timed out waiting for media to ack forcewake request.\n");
 
+	/* WaRsForcewakeWaitTC0:vlv */
 	__gen6_gt_wait_for_thread_c0(dev_priv);
 }
 

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -515,6 +515,8 @@ static int init_render_ring(struct intel_ring_buffer *ring)
 	/* We need to disable the AsyncFlip performance optimisations in order
 	 * to use MI_WAIT_FOR_EVENT within the CS. It should already be
 	 * programmed to '1' on all products.
+	 *
+	 * WaDisableAsyncFlipPerfMode:snb,ivb,hsw,vlv
 	 */
 	if (INTEL_INFO(dev)->gen >= 6)
 		I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE));