drm/edid: Add quirk for Sony PVM-2541A to get 12 bpc hdmi deep color.

The Sony PVM-2541A OLED high precision color display supports
both 10 bpc and 12 bpc hdmi deep color input, but its edid
does not signal any deep color support.

Add a quirk to force it being treated as a 12 bpc panel.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 3989c185579f..643f830f3413 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -70,6 +70,8 @@
 #define EDID_QUIRK_FORCE_REDUCED_BLANKING       (1 << 7)
 /* Force 8bpc */
 #define EDID_QUIRK_FORCE_8BPC                   (1 << 8)
+/* Force 12bpc */
+#define EDID_QUIRK_FORCE_12BPC                  (1 << 9)
 
 struct detailed_mode_closure {
         struct drm_connector *connector;
@@ -125,6 +127,9 @@ static struct edid_quirk {
         { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 },
         { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 },
 
+        /* Sony PVM-2541A does up to 12 bpc, but only reports max 8 bpc */
+        { "SNY", 0x2541, EDID_QUIRK_FORCE_12BPC },
+
         /* ViewSonic VA2026w */
         { "VSC", 5020, EDID_QUIRK_FORCE_REDUCED_BLANKING },
 
@@ -3660,6 +3665,9 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
         if (quirks & EDID_QUIRK_FORCE_8BPC)
                 connector->display_info.bpc = 8;
 
+        if (quirks & EDID_QUIRK_FORCE_12BPC)
+                connector->display_info.bpc = 12;
+
         return num_modes;
 }
 EXPORT_SYMBOL(drm_add_edid_modes);