Patch "drm/radeon: Add a common function for DFS handling" has been added to the 4.4-stable tree

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 <[email protected]> know about it.

From: Slava Grigorev <[email protected]>
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 <[email protected]>

commit a64c9dab1c4d05c87ec8a1cb9b48915816462143 upstream.

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

---
 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(-)

@@ -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);

@@ -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;
+}

@@ -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 [email protected] 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