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Bug #11365: Disable the panel fitter unless it's needed for the chosen mode. 

The automatic panel scaling appears to choose bad sampling on some GM965
hardware for 1:1 mapping modes, and there's no real sense in having it on
if we just want 1:1.
This commit is contained in:
Eric Anholt 2007-07-02 14:38:28 -07:00
parent 1e2e301348
commit 3d9ee8b299
1 changed files with 12 additions and 6 deletions
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18
src/i830_lvds.c
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@ -261,17 +261,23 @@ i830_lvds_mode_set(xf86OutputPtr output, DisplayModePtr mode,
I830CrtcPrivatePtr intel_crtc = output->crtc->driver_private;
CARD32 pfit_control;
/* The LVDS pin pair will already have been turned on in the
/* The LVDS pin pair will already have been turned on in
* i830_crtc_mode_set since it has a large impact on the DPLL settings.
*/
/* Enable automatic panel scaling so that non-native modes fill the
* screen. Should be enabled before the pipe is enabled, according to
/* Enable automatic panel scaling for non-native modes so that they fill
* the screen. Should be enabled before the pipe is enabled, according to
* register description and PRM.
*/
pfit_control = (PFIT_ENABLE |
VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
VERT_INTERP_BILINEAR | HORIZ_INTERP_BILINEAR);
if (mode->HDisplay != adjusted_mode->HDisplay ||
mode->VDisplay != adjusted_mode->VDisplay)
{
pfit_control = PFIT_ENABLE |
VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
VERT_INTERP_BILINEAR | HORIZ_INTERP_BILINEAR;
} else {
pfit_control = 0;
}
if (!IS_I965G(pI830)) {
if (dev_priv->panel_wants_dither)