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drm/radeon: Add a common function for DFS handling

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Move encoding of DFS (digital frequency synthesizer) divider into a
separate function and improve calculation precision.

Signed-off-by: Slava Grigorev <slava.grigorev@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Slava Grigorev 2016-01-26 16:56:25 -05:00 committed by Alex Deucher
parent c9a392eac1
commit a64c9dab1c
3 changed files with 15 additions and 10 deletions
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12
drivers/gpu/drm/radeon/dce6_afmt.c
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@ -304,18 +304,10 @@ void dce6_dp_audio_set_dto(struct radeon_device *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;
div = radeon_audio_decode_dfs_div(div);
if (div)
clock /= div;
clock = clock * 100 / div;
WREG32(DCE8_DCCG_AUDIO_DTO1_PHASE, 24000);
WREG32(DCE8_DCCG_AUDIO_DTO1_MODULE, clock);

12
drivers/gpu/drm/radeon/radeon_audio.c
View File

@ -775,3 +775,15 @@ void radeon_audio_dpms(struct drm_encoder *encoder, int mode)
if (radeon_encoder->audio && radeon_encoder->audio->dpms)
radeon_encoder->audio->dpms(encoder, mode == DRM_MODE_DPMS_ON);
}
unsigned int radeon_audio_decode_dfs_div(unsigned int div)
{
if (div >= 8 && div < 64)
return (div - 8) * 25 + 200;
else if (div >= 64 && div < 96)
return (div - 64) * 50 + 1600;
else if (div >= 96 && div < 128)
return (div - 96) * 100 + 3200;
else
return 0;
}

1
drivers/gpu/drm/radeon/radeon_audio.h
View File

@ -79,5 +79,6 @@ void radeon_audio_fini(struct radeon_device *rdev);
void radeon_audio_mode_set(struct drm_encoder *encoder,
struct drm_display_mode *mode);
void radeon_audio_dpms(struct drm_encoder *encoder, int mode);
unsigned int radeon_audio_decode_dfs_div(unsigned int div);
#endif