[PATCH 4.4 101/103] drm/edid: Add 10 bpc quirk for LGD 764 panel in HP zBook 17 G2

From: Greg Kroah-Hartman
Date: Tue May 23 2017 - 17:21:35 EST


4.4-stable review patch. If anyone has any objections, please let me know.

------------------

From: Mario Kleiner <mario.kleiner.de@xxxxxxxxx>

commit e345da82bd6bdfa8492f80b3ce4370acfd868d95 upstream.

The builtin eDP panel in the HP zBook 17 G2 supports 10 bpc,
as advertised by the Laptops product specs and verified via
injecting a fixed edid + photometer measurements, but edid
reports unknown depth, so drivers fall back to 6 bpc.

Add a quirk to get the full 10 bpc.

Signed-off-by: Mario Kleiner <mario.kleiner.de@xxxxxxxxx>
Acked-by: Harry Wentland <harry.wentland@xxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/1492787108-23959-1-git-send-email-mario.kleiner.de@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/gpu/drm/drm_edid.c | 8 ++++++++
1 file changed, 8 insertions(+)

--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -75,6 +75,8 @@
#define EDID_QUIRK_FORCE_12BPC (1 << 9)
/* Force 6bpc */
#define EDID_QUIRK_FORCE_6BPC (1 << 10)
+/* Force 10bpc */
+#define EDID_QUIRK_FORCE_10BPC (1 << 11)

struct detailed_mode_closure {
struct drm_connector *connector;
@@ -117,6 +119,9 @@ static struct edid_quirk {
{ "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 |
EDID_QUIRK_DETAILED_IN_CM },

+ /* LGD panel of HP zBook 17 G2, eDP 10 bpc, but reports unknown bpc */
+ { "LGD", 764, EDID_QUIRK_FORCE_10BPC },
+
/* LG Philips LCD LP154W01-A5 */
{ "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
{ "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
@@ -3834,6 +3839,9 @@ int drm_add_edid_modes(struct drm_connec
if (quirks & EDID_QUIRK_FORCE_8BPC)
connector->display_info.bpc = 8;

+ if (quirks & EDID_QUIRK_FORCE_10BPC)
+ connector->display_info.bpc = 10;
+
if (quirks & EDID_QUIRK_FORCE_12BPC)
connector->display_info.bpc = 12;