[alsa-devel] [PATCH V2 1/1] drm/i915/audio: apply SKL codec wake up patch to BXT

[Jani Nikula]

On Thu, 19 Nov 2015, Daniel Vetter <daniel at ffwll.ch> wrote:
> On Thu, Nov 19, 2015 at 10:44:48PM +0800, han.lu at intel.com wrote:
>> From: "Lu, Han" <han.lu at intel.com>
>> 
>> For SKL we added a commit 632f3ab95fe2 ("drm/i915/audio: add codec wakeup
>> override enabled/disable callback"), in order to enable codec wakeup
>> override signal, to allow re-enumeration of the controller on SKL after
>> resume from low power state.
>> In SKL, HDMI/DP codec and PCH HD Audio Controller are in different power
>> wells, so it's necessary to reset display audio codecs when power well on,
>> otherwise display audio codecs will disappear when resume from low power
>> state.
>> Reset steps when power on:
>>     enable codec wakeup -> azx_init_chip() -> disable codec wakeup
>> Since the power well design did not change from SKL to BXT, we need to
>> apply the workaround to BXT also.
>> 
>> v2: add explanation
>> 
>> Signed-off-by: Lu, Han <han.lu at intel.com>
>> 
>> diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
>> index 63d4706..8310bf3 100644
>> --- a/drivers/gpu/drm/i915/intel_audio.c
>> +++ b/drivers/gpu/drm/i915/intel_audio.c
>> @@ -591,7 +591,8 @@ static void i915_audio_component_codec_wake_override(struct device *dev,
>>  	struct drm_i915_private *dev_priv = dev_to_i915(dev);
>>  	u32 tmp;
>>  
>> -	if (!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv))
>> +	if (!IS_SKYLAKE(dev_priv) && !IS_BROXTON(dev_priv) &&
>> +			!IS_KABYLAKE(dev_priv))
>
> if (INTEL_INFO(dev)->gen < 9)
> 	return;
>
> for future-proofing? At least make it an IS_GEN9 check instead of
> listening all of them in a long list.

http://mid.gmane.org/87a8qacq5w.fsf@intel.com ...

> -Daniel
>
>>  		return;
>>  
>>  	/*
>> -- 
>> 2.5.0
>> 

-- 
Jani Nikula, Intel Open Source Technology Center