Patch "drm/edid: Add 10 bpc quirk for LGD 764 panel in HP zBook 17 G2" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

drm/edid: Add 10 bpc quirk for LGD 764 panel in HP zBook 17 G2

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:

     drm-edid-add-10-bpc-quirk-for-lgd-764-panel-in-hp-zbook-17-g2.patch

and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Mario Kleiner <[email protected]>
Date: Fri, 21 Apr 2017 17:05:08 +0200
Subject: drm/edid: Add 10 bpc quirk for LGD 764 panel in HP zBook 17 G2

From: Mario Kleiner <[email protected]>

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.

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

@@ -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;
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/drm-amdgpu-avoid-overflows-divide-by-zero-in-latency_watermark-calculations.patch queue-4.4/drm-amdgpu-make-display-watermark-calculations-more-accurate.patch queue-4.4/drm-edid-add-10-bpc-quirk-for-lgd-764-panel-in-hp-zbook-17-g2.patch