On Thu, 19 Nov 2015, Daniel Vetter <daniel@xxxxxxxx> wrote:
> On Thu, Nov 19, 2015 at 10:44:48PM +0800, han.lu@xxxxxxxxx wrote:
>> From: "Lu, Han" <han.lu@xxxxxxxxx>
>>
>> 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@xxxxxxxxx>
>>
>> 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@xxxxxxxxx ...
> -Daniel
>
>> return;
>>
>> /*
>> --
>> 2.5.0
>>
--
Jani Nikula, Intel Open Source Technology Center
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