This is a note to let you know that I've just added the patch titled
drm/radeon: Add a common function for DFS handling
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-radeon-add-a-common-function-for-dfs-handling.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a64c9dab1c4d05c87ec8a1cb9b48915816462143 Mon Sep 17 00:00:00 2001
From: Slava Grigorev <slava.grigorev@xxxxxxx>
Date: Tue, 26 Jan 2016 16:56:25 -0500
Subject: drm/radeon: Add a common function for DFS handling
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From: Slava Grigorev <slava.grigorev@xxxxxxx>
commit a64c9dab1c4d05c87ec8a1cb9b48915816462143 upstream.
Move encoding of DFS (digital frequency synthesizer) divider into a
separate function and improve calculation precision.
Signed-off-by: Slava Grigorev <slava.grigorev@xxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/radeon/dce6_afmt.c | 12 ++----------
drivers/gpu/drm/radeon/radeon_audio.c | 12 ++++++++++++
drivers/gpu/drm/radeon/radeon_audio.h | 1 +
3 files changed, 15 insertions(+), 10 deletions(-)
--- a/drivers/gpu/drm/radeon/dce6_afmt.c
+++ b/drivers/gpu/drm/radeon/dce6_afmt.c
@@ -304,18 +304,10 @@ void dce6_dp_audio_set_dto(struct radeon
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);
--- 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_encode
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;
+}
--- 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_dev
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
Patches currently in stable-queue which might be from slava.grigorev@xxxxxxx are
queue-4.4/drm-radeon-fix-dp-audio-support-for-apu-with-dce4.1-display-engine.patch
queue-4.4/drm-radeon-cleaned-up-vco-output-settings-for-dp-audio.patch
queue-4.4/drm-radeon-fix-slow-audio-over-dp-on-dce8.patch
queue-4.4/drm-radeon-add-a-common-function-for-dfs-handling.patch
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