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drm/edid: Yank a helpful comment about EST modes from xf86EdidModes.c 

I got very confused when I tried to compare the EST modes with the spec.
Bring over a comment from xf86EdidModes.c that actually describes some
of history where these things came from.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
hifive-unleashed-5.1
Ville Syrjälä 2013-10-14 16:44:27 +03:00 committed by Dave Airlie
parent 891a74692f
commit e7bfa5c407
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/drm/drm_edid.c
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@ -458,6 +458,15 @@ static const struct drm_display_mode drm_dmt_modes[] = {
DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
};
/*
* These more or less come from the DMT spec. The 720x400 modes are
* inferred from historical 80x25 practice. The 640x480@67 and 832x624@75
* modes are old-school Mac modes. The EDID spec says the 1152x864@75 mode
* should be 1152x870, again for the Mac, but instead we use the x864 DMT
* mode.
*
* The DMT modes have been fact-checked; the rest are mild guesses.
*/
static const struct drm_display_mode edid_est_modes[] = {
{ DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 40000, 800, 840,
968, 1056, 0, 600, 601, 605, 628, 0,