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drm/radeon/dpm/rs780: don't enable sclk scaling if not required

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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>
This commit is contained in:
Alex Deucher 2013-09-13 10:55:10 -04:00
parent ce7b30e025
commit e40210cca9
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/radeon/rs780_dpm.c
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@ -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);
}