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drm/i915/lvds: Restore dithering on native modes for gen2/3

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A regression introduced in bee17e5 cleared the dithering bit for native
modes on gen2/3.

Bugzilla: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/711568
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2011-02-06 15:50:52 +00:00
parent 71a77e07d0
commit 72389a33b8
1 changed files with 6 additions and 6 deletions
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12
drivers/gpu/drm/i915/intel_lvds.c
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@ -261,12 +261,6 @@ static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
return true;
}
/* Make sure pre-965s set dither correctly */
if (INTEL_INFO(dev)->gen < 4) {
if (dev_priv->lvds_dither)
pfit_control |= PANEL_8TO6_DITHER_ENABLE;
}
/* Native modes don't need fitting */
if (adjusted_mode->hdisplay == mode->hdisplay &&
adjusted_mode->vdisplay == mode->vdisplay)
@ -374,10 +368,16 @@ static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
}
out:
/* If not enabling scaling, be consistent and always use 0. */
if ((pfit_control & PFIT_ENABLE) == 0) {
pfit_control = 0;
pfit_pgm_ratios = 0;
}
/* Make sure pre-965 set dither correctly */
if (INTEL_INFO(dev)->gen < 4 && dev_priv->lvds_dither)
pfit_control |= PANEL_8TO6_DITHER_ENABLE;
if (pfit_control != intel_lvds->pfit_control ||
pfit_pgm_ratios != intel_lvds->pfit_pgm_ratios) {
intel_lvds->pfit_control = pfit_control;