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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/radeon_audio.c
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@@ -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;
}