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drm/radeon/dpm/rs780: don't enable sclk scaling if not required
author
Alex Deucher
<alexander.deucher@amd.com>
Fri, 13 Sep 2013 14:55:10 +0000
(10:55 -0400)
committer
Alex Deucher
<alexander.deucher@amd.com>
Mon, 16 Sep 2013 00:27:50 +0000
(20:27 -0400)
If the low and high sclks are the same, there is no need to
enable sclk scaling. This causes display stability issues on
certain boards.
Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=60857
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Reviewed-by: Christian König <christian.koenig@amd.com>
drivers/gpu/drm/radeon/rs780_dpm.c
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diff --git
a/drivers/gpu/drm/radeon/rs780_dpm.c
b/drivers/gpu/drm/radeon/rs780_dpm.c
index
31487ce
..
eb336bf
100644
(file)
--- a/
drivers/gpu/drm/radeon/rs780_dpm.c
+++ b/
drivers/gpu/drm/radeon/rs780_dpm.c
@@
-499,6
+499,9
@@
static void rs780_activate_engine_clk_scaling(struct radeon_device *rdev,
(new_state->sclk_low == old_state->sclk_low))
return;
+ if (new_state->sclk_high == new_state->sclk_low)
+ return;
+
rs780_clk_scaling_enable(rdev, true);
}