From: Alex Deucher Date: Fri, 13 Sep 2013 14:55:10 +0000 (-0400) Subject: drm/radeon/dpm/rs780: don't enable sclk scaling if not required X-Git-Tag: v3.12-rc2~3^2~8^2~5 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e40210cca98068835acd5a4fe760bf96b3a1aa48;p=profile%2Fivi%2Fkernel-x86-ivi.git drm/radeon/dpm/rs780: don't enable sclk scaling if not required 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 Cc: stable@vger.kernel.org Reviewed-by: Christian König --- diff --git a/drivers/gpu/drm/radeon/rs780_dpm.c b/drivers/gpu/drm/radeon/rs780_dpm.c index 31487ce..eb336bf 100644 --- 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); }