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drm/radeon: Fix "slow" audio over DP on DCE8+

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DP audio is derived from the dfs clock.

Signed-off-by: Slava Grigorev <slava.grigorev@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Slava Grigorev
2015-12-17 11:09:58 -05:00
committed by Alex Deucher
parent ee1782c3f2
commit ac4a9350ab
4 changed files with 29 additions and 0 deletions
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16
drivers/gpu/drm/radeon/dce6_afmt.c
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@@ -301,6 +301,22 @@ void dce6_dp_audio_set_dto(struct radeon_device *rdev,
* is the numerator, DCCG_AUDIO_DTOx_MODULE is the denominator
*/
if (ASIC_IS_DCE8(rdev)) {
unsigned int div = (RREG32(DENTIST_DISPCLK_CNTL) &
DENTIST_DPREFCLK_WDIVIDER_MASK) >>
DENTIST_DPREFCLK_WDIVIDER_SHIFT;
if (div < 128 && div >= 96)
div -= 64;
else if (div >= 64)
div = div / 2 - 16;
else if (div >= 8)
div /= 4;
else
div = 0;
if (div)
clock = rdev->clock.gpupll_outputfreq * 10 / div;
WREG32(DCE8_DCCG_AUDIO_DTO1_PHASE, 24000);
WREG32(DCE8_DCCG_AUDIO_DTO1_MODULE, clock);
} else {