drm/edid: Add a workaround for 1366x768 HD panel
HD panel (1366x768) found most commonly on laptops can't be represented
exactly in CVT/DMT expression, which leads to 1368x768 instead, because
1366 can't be divided by 8.
Add a hack to convert to 1366x768 manually as an exception.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index bad2f11..c6366e9 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1039,6 +1039,19 @@
return modes;
}
+/* fix up 1366x768 mode from 1368x768;
+ * GFT/CVT can't express 1366 width which isn't dividable by 8
+ */
+static void fixup_mode_1366x768(struct drm_display_mode *mode)
+{
+ if (mode->hdisplay == 1368 && mode->vdisplay == 768) {
+ mode->hdisplay = 1366;
+ mode->hsync_start--;
+ mode->hsync_end--;
+ drm_mode_set_name(mode);
+ }
+}
+
static int
drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid,
struct detailed_timing *timing)
@@ -1053,6 +1066,7 @@
if (!newmode)
return modes;
+ fixup_mode_1366x768(newmode);
if (!mode_in_range(newmode, edid, timing)) {
drm_mode_destroy(dev, newmode);
continue;
@@ -1080,6 +1094,7 @@
if (!newmode)
return modes;
+ fixup_mode_1366x768(newmode);
if (!mode_in_range(newmode, edid, timing)) {
drm_mode_destroy(dev, newmode);
continue;