Revert "drm/i915: Don't set the 8to6 dither flag when not scaling"

This reverts commit 773875bfb6737982903c42d1ee88cf60af80089c.

It is very much needed and the lack of dithering has been reported by
a large list of people with various gen2/3 hardware.

Also, the original patch was complete non-sense since the WARNING
backtraces in the references bugzilla are about
gmch_pfit.lvds_border_bits mismatch, not at all about the dither bit.
That one seems to work.

Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Hans de Bruin <jmdebruin@xmsnet.nl>
Cc: stable@vger.kernel.org
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 23126023aeba..5e5a72fca5fb 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -111,6 +111,13 @@ static void intel_lvds_get_config(struct intel_encoder *encoder,
 
         pipe_config->adjusted_mode.flags |= flags;
 
+        /* gen2/3 store dither state in pfit control, needs to match */
+        if (INTEL_INFO(dev)->gen < 4) {
+                tmp = I915_READ(PFIT_CONTROL);
+
+                pipe_config->gmch_pfit.control |= tmp & PANEL_8TO6_DITHER_ENABLE;
+        }
+
         dotclock = pipe_config->port_clock;
 
         if (HAS_PCH_SPLIT(dev_priv->dev))