From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_edid.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 1988865..76b10da 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -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,
--
1.8.1.5
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