This is a note to let you know that I've just added the patch titled
drm/radeon/dpm: disable mclk switching on desktop RV770
to the 3.12-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-radeon-dpm-disable-mclk-switching-on-desktop-rv770.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8097d94116d0c17e774ba4c8256e774018dc2a46 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Tue, 7 Jan 2014 13:51:51 -0500
Subject: drm/radeon/dpm: disable mclk switching on desktop RV770
From: Alex Deucher <alexander.deucher@xxxxxxx>
commit 8097d94116d0c17e774ba4c8256e774018dc2a46 upstream.
Mclk switching doesn't seem to work reliably on these
cards. Most RV770 boards specify the same mclk for all
performance levels anyway so in most cases, this has
no affect.
Bug:
https://bugs.freedesktop.org/show_bug.cgi?id=73067
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/radeon/rv770_dpm.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/gpu/drm/radeon/rv770_dpm.c
+++ b/drivers/gpu/drm/radeon/rv770_dpm.c
@@ -2531,6 +2531,12 @@ bool rv770_dpm_vblank_too_short(struct r
(rdev->pdev->subsystem_device == 0x1c42))
switch_limit = 200;
+ /* RV770 */
+ /* mclk switching doesn't seem to work reliably on desktop RV770s */
+ if ((rdev->family == CHIP_RV770) &&
+ !(rdev->flags & RADEON_IS_MOBILITY))
+ switch_limit = 0xffffffff; /* disable mclk switching */
+
if (vblank_time < switch_limit)
return true;
else
Patches currently in stable-queue which might be from alexander.deucher@xxxxxxx are
queue-3.12/drm-radeon-warn-users-when-hw_i2c-is-enabled-v2.patch
queue-3.12/drm-radeon-dpm-disable-mclk-switching-on-desktop-rv770.patch
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