drm/i915: We implement WaFbcWaitForVBlankBeforeEnable for ilk and snb

We also wait for that blank on other platforms but the w/a doesn't
apply there. Not an issue at all.

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>

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index bc5aae088550e8b86b8efc53ba9bcbeeb578953c..cae89fe9b84f85d731e80e4cbd2bf7549225ea86 100644 (file)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -404,6 +404,8 @@ static void intel_enable_fbc(struct drm_crtc *crtc, unsigned long interval)
         * following the termination of the page-flipping sequence
         * and indeed performing the enable as a co-routine and not
         * waiting synchronously upon the vblank.
+        *
+        * WaFbcWaitForVBlankBeforeEnable:ilk,snb
         */
        schedule_delayed_work(&work->work, msecs_to_jiffies(50));
 }