This is a note to let you know that I've just added the patch titled
drm/amdgpu: Fix hdmi deep color support.
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-amdgpu-fix-hdmi-deep-color-support.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 9d746ab68163d642dae13756b2b3145b2e38cb65 Mon Sep 17 00:00:00 2001
From: Mario Kleiner <mario.kleiner.de@xxxxxxxxx>
Date: Tue, 24 May 2016 18:12:43 +0200
Subject: drm/amdgpu: Fix hdmi deep color support.
From: Mario Kleiner <mario.kleiner.de@xxxxxxxxx>
commit 9d746ab68163d642dae13756b2b3145b2e38cb65 upstream.
When porting the hdmi deep color detection code from
radeon-kms to amdgpu-kms apparently some kind of
copy and paste error happened, attaching an else
branch to the wrong if statement.
The result is that hdmi deep color mode is always
disabled, regardless of gpu and display capabilities and
user wishes, as the code mistakenly thinks that the display
doesn't provide the required max_tmds_clock limit and falls
back to 8 bpc.
This patch fixes deep color support, as tested on a
R9 380 Tonga Pro + suitable display, and should be
backported to all kernels with amdgpu-kms support.
Signed-off-by: Mario Kleiner <mario.kleiner.de@xxxxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
@@ -194,12 +194,12 @@ int amdgpu_connector_get_monitor_bpc(str
bpc = 8;
DRM_DEBUG("%s: HDMI deep color 10 bpc exceeds max tmds clock. Using %d bpc.\n",
connector->name, bpc);
- } else if (bpc > 8) {
- /* max_tmds_clock missing, but hdmi spec mandates it for deep color. */
- DRM_DEBUG("%s: Required max tmds clock for HDMI deep color missing. Using 8 bpc.\n",
- connector->name);
- bpc = 8;
}
+ } else if (bpc > 8) {
+ /* max_tmds_clock missing, but hdmi spec mandates it for deep color. */
+ DRM_DEBUG("%s: Required max tmds clock for HDMI deep color missing. Using 8 bpc.\n",
+ connector->name);
+ bpc = 8;
}
}
Patches currently in stable-queue which might be from mario.kleiner.de@xxxxxxxxx are
queue-4.4/drm-amdgpu-fix-hdmi-deep-color-support.patch
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