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authorLibin Yang <libin.yang@intel.com>2016-11-11 16:46:28 +0800
committerJani Nikula <jani.nikula@intel.com>2016-11-24 16:42:42 +0200
commit60abfbb86a8d51576f90c5adcbb4f547a2952782 (patch)
treed9d581fe21bc11221ee151a51c67b4a0bc7abdf1 /drivers/gpu/drm/i915/intel_audio.c
parent41736a8e3331a67445b271e73be39536c498659e (diff)
downloadlinux-60abfbb86a8d51576f90c5adcbb4f547a2952782.tar.bz2
drm/i915/audio: fix hdmi audio noise issue
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: 6014ac122ed0 ("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
Diffstat (limited to 'drivers/gpu/drm/i915/intel_audio.c')
-rw-r--r--drivers/gpu/drm/i915/intel_audio.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
index 1c509f7410f5..49f10538d4aa 100644
--- a/drivers/gpu/drm/i915/intel_audio.c
+++ b/drivers/gpu/drm/i915/intel_audio.c
@@ -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);
}