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 <stable@xxxxxxxxxxxxxxx> know about it.
>From e345da82bd6bdfa8492f80b3ce4370acfd868d95 Mon Sep 17 00:00:00 2001
From: Mario Kleiner <mario.kleiner.de@xxxxxxxxx>
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 <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;
Patches currently in stable-queue which might be from mario.kleiner.de@xxxxxxxxx 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