tree b4400b419662d459606616a0bf618320c1b47802
parent 88ef4e3f4f616462b78a7838eb3ffc3818d30f67
author Keith Packard <keithp@keithp.com> 1315248801 -0700
committer Keith Packard <keithp@keithp.com> 1316641960 -0700

drm/i915: Enable dither whenever display bpc < frame buffer bpc

We want to enable dithering on any pipe where the frame buffer has
more color resolution than the output device.

The previous code was incorrectly clamping the frame buffer bpc to the
display bpc, effectively disabling dithering all of the time as the
computed frame buffer bpc would never be larger than the display bpc.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reported-by: Oliver Hartkopp <socketcan@hartkopp.net>
Tested-by: Oliver Hartkopp <socketcan@hartkopp.net>