1 files changed, 12 insertions, 3 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index bae38acf44dc..5908cd563400 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3478,8 +3478,11 @@ static bool intel_crtc_mode_fixup(struct drm_crtc *crtc,
                         return false;
         }
 
-        /* All interlaced capable intel hw wants timings in frames. */
-        drm_mode_set_crtcinfo(adjusted_mode, 0);
+        /* All interlaced capable intel hw wants timings in frames. Note though
+         * that intel_lvds_mode_fixup does some funny tricks with the crtc
+         * timings, so we need to be careful not to clobber these.*/
+        if (!(adjusted_mode->private_flags & INTEL_MODE_CRTC_TIMINGS_SET))
+                drm_mode_set_crtcinfo(adjusted_mode, 0);
 
         return true;
 }
@@ -7465,7 +7468,13 @@ static int intel_gen6_queue_flip(struct drm_device *dev,
         OUT_RING(fb->pitches[0] | obj->tiling_mode);
         OUT_RING(obj->gtt_offset);
 
-        pf = I915_READ(PF_CTL(intel_crtc->pipe)) & PF_ENABLE;
+        /* Contrary to the suggestions in the documentation,
+         * "Enable Panel Fitter" does not seem to be required when page
+         * flipping with a non-native mode, and worse causes a normal
+         * modeset to fail.
+         * pf = I915_READ(PF_CTL(intel_crtc->pipe)) & PF_ENABLE;
+         */
+        pf = 0;
         pipesrc = I915_READ(PIPESRC(intel_crtc->pipe)) & 0x0fff0fff;
         OUT_RING(pf | pipesrc);
         ADVANCE_LP_RING();