Commit e40210cc authored Sep 13, 2013 by Alex Deucher

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 <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Reviewed-by: Christian König <christian.koenig@amd.com>

parent ce7b30e0

drivers/gpu/drm/radeon/rs780_dpm.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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);
		}