linux: drm/radeon: use sw CTS/N values for audio on DCE4+

thanks @fritsch

packages/linux/patches/3.11.6/linux-999.03-drm-radeon-use-sw-CTS-N-values-for-audio-on-DCE4.patch

@@ -0,0 +1,32 @@
+From 311ae5e07738b76bf8ec9667840caaad0657ded6 Mon Sep 17 00:00:00 2001
+From: Alex Deucher <alexander.deucher@amd.com>
+Date: Tue, 22 Oct 2013 10:46:59 -0400
+Subject: [PATCH] drm/radeon: use sw CTS/N values for audio on DCE4+
+
+Use the driver calculated CTS and N values rather than
+having hardware generate them.  This allows us to use
+the modeline pixel clock rather than the actual pll clock
+when setting up the dto for audio.  Fixes problems with
+audio playback rate on certain asics if the pll clock
+does not match the pixel clock exactly.
+
+Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
+Cc: stable@vger.kernel.org
+---
+ drivers/gpu/drm/radeon/evergreen_hdmi.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/drivers/gpu/drm/radeon/evergreen_hdmi.c b/drivers/gpu/drm/radeon/evergreen_hdmi.c
+index fe1de85..57fcc4b 100644
+--- a/drivers/gpu/drm/radeon/evergreen_hdmi.c
++++ b/drivers/gpu/drm/radeon/evergreen_hdmi.c
+@@ -291,6 +291,7 @@ void evergreen_hdmi_setmode(struct drm_encoder *encoder, struct drm_display_mode
+ 	/* fglrx clears sth in AFMT_AUDIO_PACKET_CONTROL2 here */
+ 
+ 	WREG32(HDMI_ACR_PACKET_CONTROL + offset,
++	       HDMI_ACR_SOURCE | /* select SW CTS value */
+ 	       HDMI_ACR_AUTO_SEND); /* allow hw to sent ACR packets when required */
+ 
+ 	evergreen_hdmi_update_ACR(encoder, mode->clock);
+-- 
+1.8.3.1