[PATCH 4/4] drm/radeon/dpm/rs780: fix force_performance state for same sclks

[Alex Deucher]

If the low and high sclks within a power state are the same,
there no need to enable sclk scaling.  Enabling sclk scaling
can cause display stability issues on some boards.

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/radeon/rs780_dpm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/radeon/rs780_dpm.c b/drivers/gpu/drm/radeon/rs780_dpm.c
index eb336bf..6af8505 100644
--- a/drivers/gpu/drm/radeon/rs780_dpm.c
+++ b/drivers/gpu/drm/radeon/rs780_dpm.c
@@ -1043,8 +1043,10 @@ int rs780_dpm_force_performance_level(struct radeon_device *rdev,
 		if (pi->voltage_control)
 			rs780_force_voltage(rdev, pi->max_voltage);
 
-		WREG32_P(FVTHROT_FBDIV_REG1, 0, ~FORCE_FEEDBACK_DIV);
-		rs780_clk_scaling_enable(rdev, true);
+		if (ps->sclk_high != ps->sclk_low) {
+			WREG32_P(FVTHROT_FBDIV_REG1, 0, ~FORCE_FEEDBACK_DIV);
+			rs780_clk_scaling_enable(rdev, true);
+		}
 
 		if (pi->voltage_control) {
 			rs780_voltage_scaling_enable(rdev, true);
-- 
1.8.3.1