renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-22 20:23:57 +08:00
Code

drm/i915/audio: fix hdmi audio noise issue

Browse Source 
Some monitors will have noise or even no sound after
applying the patch 6014ac12.

In patch 6014ac12, it will reset the cts value to 0 for HDMI.
However, we need to disable Enable CTS or M Prog bit. This is
the initial setting after HW reset.

Fixes: 6014ac122e ("drm/i915/audio: set proper N/M in modeset")
Signed-off-by: Libin Yang <libin.yang@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1478853988-139842-1-git-send-email-libin.yang@intel.com
This commit is contained in:
Libin Yang 2016-11-11 16:46:28 +08:00 committed by Jani Nikula
parent 41736a8e33
commit 60abfbb86a
1 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/gpu/drm/i915/intel_audio.c
View File

@ -351,10 +351,13 @@ hsw_hdmi_audio_config_update(struct intel_crtc *intel_crtc, enum port port,
I915_WRITE(HSW_AUD_CFG(pipe), tmp);
/*
* Let's disable "Enable CTS or M Prog bit"
* and let HW calculate the value
*/
tmp = I915_READ(HSW_AUD_M_CTS_ENABLE(pipe));
tmp &= ~AUD_CONFIG_M_MASK;
tmp &= ~AUD_M_CTS_M_PROG_ENABLE;
tmp &= ~AUD_M_CTS_M_VALUE_INDEX;
tmp |= AUD_M_CTS_M_PROG_ENABLE;
I915_WRITE(HSW_AUD_M_CTS_ENABLE(pipe), tmp);
}