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>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index bad2f11aa224..c6366e90041e 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1039,6 +1039,19 @@ drm_dmt_modes_for_range(struct drm_connector *connector, struct edid *edid,
         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 @@ drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid,
                 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 @@ drm_cvt_modes_for_range(struct drm_connector *connector, struct edid *edid,
                 if (!newmode)
                         return modes;
 
+                fixup_mode_1366x768(newmode);
                 if (!mode_in_range(newmode, edid, timing)) {
                         drm_mode_destroy(dev, newmode);
                         continue;