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drm/radeon/dpm/rs780: fix force_performance state for same sclks 

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@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
hifive-unleashed-5.1
Alex Deucher 2013-09-13 11:04:28 -04:00
parent e40210cca9
commit c2ee29d002
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/radeon/rs780_dpm.c
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@ -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);