[Intel-gfx] [PATCH 4/5] drm/i915: implement WaDisableSpriteDestColorKey

[Daniel Vetter]

Unfortunately this requires a bit of book-keeping to return the
right values for get_colorkey and to set things up correctly
when re-enabling the plane.

Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/i915/intel_drv.h    |    2 ++
 drivers/gpu/drm/i915/intel_sprite.c |   27 +++++++++++++++++++++++----
 2 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 79f8ed6..e935e75 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -220,6 +220,8 @@ struct intel_plane {
 	struct drm_i915_gem_object *obj;
 	int max_downscale;
 	u32 lut_r[1024], lut_g[1024], lut_b[1024];
+	bool restore_ilk_dest_key; /* for a w/a */
+
 	void (*update_plane)(struct drm_plane *plane,
 			     struct drm_framebuffer *fb,
 			     struct drm_i915_gem_object *obj,
diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index 7644f31..8bcacd5 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -230,6 +230,13 @@ ilk_update_plane(struct drm_plane *plane, struct drm_framebuffer *fb,
 
 	dvscntr = I915_READ(DVSCNTR(pipe));
 
+	WARN_ON(!(dvscntr & DVS_ENABLE) && (dvscntr && DVS_DEST_KEY));
+
+	if (intel_plane->restore_ilk_dest_key) {
+		dvscntr |= DVS_DEST_KEY;
+		intel_plane->restore_ilk_dest_key = false;
+	}
+
 	/* Mask out pixel format bits in case we change it */
 	dvscntr &= ~DVS_PIXFORMAT_MASK;
 	dvscntr &= ~DVS_RGB_ORDER_XBGR;
@@ -311,8 +318,16 @@ ilk_disable_plane(struct drm_plane *plane)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_plane *intel_plane = to_intel_plane(plane);
 	int pipe = intel_plane->pipe;
+	uint32_t tmp;
 
-	I915_WRITE(DVSCNTR(pipe), I915_READ(DVSCNTR(pipe)) & ~DVS_ENABLE);
+	/* WaDisableSpriteDestColorKey: We need to disable the dest key when
+	 * disabling the sprite. */
+	tmp = I915_READ(DVSCNTR(pipe));
+	if (IS_GEN5(dev) &&(tmp & DVS_DEST_KEY))
+		intel_plane->restore_ilk_dest_key = true;
+	tmp &= ~(DVS_ENABLE | DVS_DEST_KEY);
+
+	I915_WRITE(DVSCNTR(pipe), tmp);
 	/* Disable the scaler */
 	I915_WRITE(DVSSCALE(pipe), 0);
 	/* Flush double buffered register updates */
@@ -365,6 +380,7 @@ ilk_update_colorkey(struct drm_plane *plane,
 	int ret = 0;
 
 	intel_plane = to_intel_plane(plane);
+	intel_plane->restore_ilk_dest_key = false;
 
 	I915_WRITE(DVSKEYVAL(intel_plane->pipe), key->min_value);
 	I915_WRITE(DVSKEYMAX(intel_plane->pipe), key->max_value);
@@ -372,9 +388,12 @@ ilk_update_colorkey(struct drm_plane *plane,
 
 	dvscntr = I915_READ(DVSCNTR(intel_plane->pipe));
 	dvscntr &= ~(DVS_SOURCE_KEY | DVS_DEST_KEY);
-	if (key->flags & I915_SET_COLORKEY_DESTINATION)
-		dvscntr |= DVS_DEST_KEY;
-	else if (key->flags & I915_SET_COLORKEY_SOURCE)
+	if (key->flags & I915_SET_COLORKEY_DESTINATION) {
+		if ((dvscntr & DVS_ENABLE) || !IS_GEN5(dev))
+			dvscntr |= DVS_DEST_KEY;
+		else
+			intel_plane->restore_ilk_dest_key = true;
+	} else if (key->flags & I915_SET_COLORKEY_SOURCE)
 		dvscntr |= DVS_SOURCE_KEY;
 	I915_WRITE(DVSCNTR(intel_plane->pipe), dvscntr);
 
-- 
1.7.10.4