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drm: Add the basic check for the detailed timing in EDID

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Sometimes we will get the incorrect display modeline when parsing the detailed
timing in EDID. For example:
   >hsync/vsync width is zero
   >sync is beyond the blank.

So add the basic check for the detailed timing in EDID to avoid the incorrect
display modeline.

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Zhao Yakui 2009-10-14 09:11:25 +08:00 committed by Dave Airlie
parent a77f171843
commit f059d2ad69
1 changed files with 15 additions and 0 deletions
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15
drivers/gpu/drm/drm_edid.c
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@ -626,6 +626,12 @@ static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
return NULL; return NULL;
} }
/* it is incorrect if hsync/vsync width is zero */
if (!hsync_pulse_width || !vsync_pulse_width) {
DRM_DEBUG_KMS("Incorrect Detailed timing. "
"Wrong Hsync/Vsync pulse width\n");
return NULL;
}
mode = drm_mode_create(dev); mode = drm_mode_create(dev);
if (!mode) if (!mode)
return NULL; return NULL;
@ -647,6 +653,15 @@ static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
mode->vsync_end = mode->vsync_start + vsync_pulse_width; mode->vsync_end = mode->vsync_start + vsync_pulse_width;
mode->vtotal = mode->vdisplay + vblank; mode->vtotal = mode->vdisplay + vblank;
/* perform the basic check for the detailed timing */
if (mode->hsync_end > mode->htotal ||
mode->vsync_end > mode->vtotal) {
drm_mode_destroy(dev, mode);
DRM_DEBUG_KMS("Incorrect detailed timing. "
"Sync is beyond the blank.\n");
return NULL;
}
drm_mode_set_name(mode); drm_mode_set_name(mode);
if (pt->misc & DRM_EDID_PT_INTERLACED) if (pt->misc & DRM_EDID_PT_INTERLACED)