drm/i915/lvds: Disable panel-fitter on gen4 for 1:1 scale factors
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 4324a32..5b88e14 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -269,14 +269,13 @@
u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
- pfit_control |= PFIT_ENABLE;
/* 965+ is easy, it does everything in hw */
if (scaled_width > scaled_height)
- pfit_control |= PFIT_SCALING_PILLAR;
+ pfit_control |= PFIT_ENABLE | PFIT_SCALING_PILLAR;
else if (scaled_width < scaled_height)
- pfit_control |= PFIT_SCALING_LETTER;
- else
- pfit_control |= PFIT_SCALING_AUTO;
+ pfit_control |= PFIT_ENABLE | PFIT_SCALING_LETTER;
+ else if (adjusted_mode->hdisplay != mode->hdisplay)
+ pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
} else {
u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
@@ -323,13 +322,17 @@
* Full scaling, even if it changes the aspect ratio.
* Fortunately this is all done for us in hw.
*/
- pfit_control |= PFIT_ENABLE;
- if (INTEL_INFO(dev)->gen >= 4)
- pfit_control |= PFIT_SCALING_AUTO;
- else
- pfit_control |= (VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
- VERT_INTERP_BILINEAR |
- HORIZ_INTERP_BILINEAR);
+ if (mode->vdisplay != adjusted_mode->vdisplay ||
+ mode->hdisplay != adjusted_mode->hdisplay) {
+ pfit_control |= PFIT_ENABLE;
+ if (INTEL_INFO(dev)->gen >= 4)
+ pfit_control |= PFIT_SCALING_AUTO;
+ else
+ pfit_control |= (VERT_AUTO_SCALE |
+ VERT_INTERP_BILINEAR |
+ HORIZ_AUTO_SCALE |
+ HORIZ_INTERP_BILINEAR);
+ }
break;
default: