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drm/i915: Check pixel clock in ns2501 mode_valid hook 

The vbt on my Fujitsu-Siemens Lifebook S6010 provides two 800x600 modes,
60Hz and 56Hz. The magic register values we have correspond to the 60Hz
mode, and as I don't know how one would trick the VGA BIOS to set up
the 56Hz mode we can't get the magic values for the orther mode. So
when checking whether a mode is valid also check the pixel clock so that
we filter out the 56Hz variant.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Thomas Richter <richter@rus.uni-stuttgart.de>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-08-15 01:22:04 +03:00 committed by Daniel Vetter
parent d9d9bced0a
commit b07aaf8849
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/i915/dvo_ns2501.c
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@ -521,9 +521,9 @@ static enum drm_mode_status ns2501_mode_valid(struct intel_dvo_device *dvo,
* of the panel in here so we could always accept it
* by disabling the scaler.
*/
if ((mode->hdisplay == 800 && mode->vdisplay == 600) ||
(mode->hdisplay == 640 && mode->vdisplay == 480) ||
(mode->hdisplay == 1024 && mode->vdisplay == 768)) {
if ((mode->hdisplay == 640 && mode->vdisplay == 480 && mode->clock == 25175) ||
(mode->hdisplay == 800 && mode->vdisplay == 600 && mode->clock == 40000) ||
(mode->hdisplay == 1024 && mode->vdisplay == 768 && mode->clock == 65000)) {
return MODE_OK;
} else {
return MODE_ONE_SIZE; /* Is this a reasonable error? */