diff options
| author | Slava Grigorev <slava.grigorev@amd.com> | 2016-01-26 16:56:25 -0500 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-02-15 15:45:25 -0500 |
| commit | 2652823a09685084d3c1dc0abe17a2fa6596d19a (patch) | |
| tree | ab1847450c24f4aa52f72a08c51700ef5b2fbff5 /drivers | |
| parent | 7fb7275ff91c477cc1a8fbbd9667343f8261998e (diff) | |
| download | lwn-2652823a09685084d3c1dc0abe17a2fa6596d19a.tar.gz lwn-2652823a09685084d3c1dc0abe17a2fa6596d19a.zip | |
drm/radeon: Add a common function for DFS handling
[ Upstream commit a64c9dab1c4d05c87ec8a1cb9b48915816462143 ]
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
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/radeon/dce6_afmt.c | 12 | ||||
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_audio.c | 12 | ||||
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_audio.h | 1 |
3 files changed, 15 insertions, 10 deletions
diff --git a/drivers/gpu/drm/radeon/dce6_afmt.c b/drivers/gpu/drm/radeon/dce6_afmt.c index abd72ee7a24d..848b1ffd5cc4 100644 --- a/drivers/gpu/drm/radeon/dce6_afmt.c +++ b/drivers/gpu/drm/radeon/dce6_afmt.c @@ -285,18 +285,10 @@ 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); diff --git a/drivers/gpu/drm/radeon/radeon_audio.c b/drivers/gpu/drm/radeon/radeon_audio.c index 85e1c234f020..b214663b370d 100644 --- a/drivers/gpu/drm/radeon/radeon_audio.c +++ b/drivers/gpu/drm/radeon/radeon_audio.c @@ -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; +} diff --git a/drivers/gpu/drm/radeon/radeon_audio.h b/drivers/gpu/drm/radeon/radeon_audio.h index 059cc3012062..5c70cceaa4a6 100644 --- a/drivers/gpu/drm/radeon/radeon_audio.h +++ b/drivers/gpu/drm/radeon/radeon_audio.h @@ -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 |