[Intel-gfx] [PATCH] drm: i915: Fix audio issue on BXT

Mullah, Abid A abid.a.mullah at intel.com
Mon Mar 5 06:43:30 UTC 2018 

Did u check the fix on bxt and if u didnt see any issue then u can go ahead. I will update bspec tomorrow 

Sent from my iPhone

> On Mar 4, 2018, at 10:09 PM, Singh, Gaurav K <gaurav.k.singh at intel.com> wrote:
> 
> 
> 
>> On 2/27/2018 11:00 PM, Runyan, Arthur J wrote:
>> Ok, please update the workaround page to show all the impacted projects
>> https://gfxspecs.intel.com/Predator/Home/Index/21829
> Hi,
> 
> Should we wait for Bspec to get updated or we can go ahead with the merge. Please advise.
> 
> With regards,
> Gaurav
>> 
>> 
>>> -----Original Message-----
>>> From: Mullah, Abid A
>>> Sent: Tuesday, 27 February, 2018 8:52 AM
>>> To: Runyan, Arthur J <arthur.j.runyan at intel.com>; Pandiyan, Dhinakaran
>>> <dhinakaran.pandiyan at intel.com>; Singh, Gaurav K
>>> <gaurav.k.singh at intel.com>; Neelagandan, Harigaran
>>> <harigaran.neelagandan at intel.com>
>>> Cc: intel-gfx at lists.freedesktop.org; Vivi, Rodrigo <rodrigo.vivi at intel.com>;
>>> Nikula, Jani <jani.nikula at intel.com>
>>> Subject: RE: [Intel-gfx] [PATCH] drm: i915: Fix audio issue on BXT
>>> 
>>> Yes. It will be needed for BXT also.
>>> 
>>> -----Original Message-----
>>> From: Runyan, Arthur J
>>> Sent: Tuesday, February 27, 2018 8:49 AM
>>> To: Pandiyan, Dhinakaran <dhinakaran.pandiyan at intel.com>; Singh, Gaurav
>>> K <gaurav.k.singh at intel.com>; Mullah, Abid A <abid.a.mullah at intel.com>;
>>> Neelagandan, Harigaran <harigaran.neelagandan at intel.com>
>>> Cc: intel-gfx at lists.freedesktop.org; Vivi, Rodrigo <rodrigo.vivi at intel.com>;
>>> Nikula, Jani <jani.nikula at intel.com>
>>> Subject: RE: [Intel-gfx] [PATCH] drm: i915: Fix audio issue on BXT
>>> 
>>> Abid or Hari, please check.  There was a workaround to set
>>> AUD_CHICKENBIT_REG bit 15 (Codec Wake overwrite to DACFEUNIT) on SKL
>>> and KBL.  Does it apply to BXT also?
>>> 
>>>> -----Original Message-----
>>>> From: Pandiyan, Dhinakaran
>>>> Sent: Monday, 26 February, 2018 6:04 PM
>>>> To: Runyan, Arthur J <arthur.j.runyan at intel.com>; Singh, Gaurav K
>>>> <gaurav.k.singh at intel.com>
>>>> Cc: intel-gfx at lists.freedesktop.org; Vivi, Rodrigo
>>>> <rodrigo.vivi at intel.com>; Nikula, Jani <jani.nikula at intel.com>
>>>> Subject: RE: [Intel-gfx] [PATCH] drm: i915: Fix audio issue on BXT
>>>> 
>>>> 
>>>>> -----Original Message-----
>>>>> From: Runyan, Arthur J
>>>>> Sent: Tuesday, January 9, 2018 11:55 AM
>>>>> To: Pandiyan, Dhinakaran <dhinakaran.pandiyan at intel.com>; Singh,
>>>> Gaurav K
>>>>> <gaurav.k.singh at intel.com>
>>>>> Cc: intel-gfx at lists.freedesktop.org; Vivi, Rodrigo
>>>>> <rodrigo.vivi at intel.com>
>>>>> Subject: RE: [Intel-gfx] [PATCH] drm: i915: Fix audio issue on BXT
>>>>> 
>>>>> Sorry, I've been out.  I'm checking on this.
>>>> 
>>>> Hi Art,
>>>> 
>>>> Is AUD_CHICKENBIT_REG:15 needed for BXT to fix code enumeration
>>> issues?
>>>> -DK
>>>> 
>>>>> -----Original Message-----
>>>>> From: Pandiyan, Dhinakaran
>>>>> Sent: Thursday, 4 January, 2018 2:00 PM
>>>>> To: Singh, Gaurav K <gaurav.k.singh at intel.com>
>>>>> Cc: intel-gfx at lists.freedesktop.org; Vivi, Rodrigo
>>>>> <rodrigo.vivi at intel.com>; subransu.s.prusty at intel.com; Runyan,
>>>>> Arthur J
>>>> <arthur.j.runyan at intel.com>
>>>>> Subject: Re: [Intel-gfx] [PATCH] drm: i915: Fix audio issue on BXT
>>>>> 
>>>>> +Art
>>>>> 
>>>>>> On Thu, 2018-01-04 at 22:13 +0530, Singh, Gaurav K wrote:
>>>>>>> On 1/4/2018 2:48 AM, Rodrigo Vivi wrote:
>>>>>>> On Wed, Jan 03, 2018 at 08:31:10PM +0000, Pandiyan, Dhinakaran
>>>> wrote:
>>>>>>>> On Thu, 2018-01-04 at 00:48 +0530, Gaurav K Singh wrote:
>>>>>>>>> From: Gaurav Singh <gaurav.k.singh at intel.com>
>>>>>>>>> 
>>>>>>>>> On Apollolake, with stress test warm reboot, audio card was
>>>>>>>>> not getting enumerated after reboot. This was a
>>>>>>>> The problem looks similar to
>>>>>>>> https://lists.freedesktop.org/archives/intel-gfx/2017-October/1
>>>>>>>> 4449
>>>>>>>> 5.html
>>>>>>>> 
>>>>>>>> although the proposed solutions are vastly different. I have
>>>>>>>> Cc'd some more people.
>>>>>>>> 
>>>>>>>>> spurious issue happening on Apollolake. HW codec and HD audio
>>>>>>>>> controller link was going out of sync for which there was a
>>>>>>>>> fix in
>>>>>>>>> i915 driver but was not getting invoked for BXT. Extending
>>>>>>>>> this fix to BXT as well.
>>>>>>>>> 
>>>>>>>>> Tested on apollolake chromebook by stress test warm reboot
>>>>>>>>> with
>>>>>>>>> 2500 iterations.
>>>>>>>>> 
>>>>>>>>> Signed-off-by: Gaurav K Singh <gaurav.k.singh at intel.com>
>>>>>>>>> ---
>>>>>>>>>   drivers/gpu/drm/i915/intel_audio.c | 2 +-
>>>>>>>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>>>>>>> 
>>>>>>>>> diff --git a/drivers/gpu/drm/i915/intel_audio.c
>>>>>>>>> b/drivers/gpu/drm/i915/intel_audio.c
>>>>>>>>> index f1502a0188eb..c71c04e1c3f6 100644
>>>>>>>>> --- a/drivers/gpu/drm/i915/intel_audio.c
>>>>>>>>> +++ b/drivers/gpu/drm/i915/intel_audio.c
>>>>>>>>> @@ -729,7 +729,7 @@ static void
>>>>> i915_audio_component_codec_wake_override(struct device *kdev,
>>>>>>>>>       struct drm_i915_private *dev_priv = kdev_to_i915(kdev);
>>>>>>>>>       u32 tmp;
>>>>>>>>> 
>>>>>>>>> -    if (!IS_GEN9_BC(dev_priv))
>>>>>>>>> +    if (!IS_GEN9_BC(dev_priv) && !IS_BROXTON(dev_priv))
>>>>>>>> IS_GEN9()? GLK might need this too.
>>>>>>> I think this is applicable for all Gen9 platforms.
>>>>>>> if GLK need there is the possibility of CNL also needing it...
>>>>>>> So not sure where to stop.
>>>>>>> 
>>>>>>> Also looking to the original patch that introduced this
>>>>>>> function, commit '632f3ab95fe2 ("drm/i915/audio: add codec
>>>>>>> wakeup override enabled/disable callback")'
>>>>>>> 
>>>>>>> it tells that the reason was:
>>>>>>> "In SKL, HDMI/DP codec and PCH HD Audio Controller are in
>>>>>>> different p$ wells, so it's necessary to reset display audio
>>>>>>> codecs when power we$ otherwise display audio codecs will
>>>>>>> disappear when resume from low p$ state."
>>>>>>> 
>>>>>>> Is this the case here on BXT?
>>>>>> Yes, its the same case with BXT.
>>>>>>> Another interesting thing I noticed on Spec when searching for
>>>>>>> this bit was that this bit is related to an workaround on SKL/KBL/CFL...
>>>>>>> no mention to BXT.
>>>>>>> 
>>>>>>> "This workaround is needed for an HW issue in SKL and KBL in
>>>>>>> which HW codec and HD audio controller link was going out of sync."
>>>>>> Yes, in Bspec it has been mentioned only for SKL and KBL. But
>>>>>> without this fix, sound card was not getting enumerated for BXT.
>>>>> 
>>>>> Art,
>>>>> 
>>>>> Can you please help us here? To summarize, the question is what
>>>>> platforms
>>>> need
>>>>> the AUD_CHICKENBIT_REG:15 bit to be set to avoid code enumeration
>>>> failures?
>>>>> -DK
>>>>> 
>>>>>>> Thanks,
>>>>>>> Rodrigo.
>>>>>>> 
>>>>>>>>>           return;
>>>>>>>>> 
>>>>>>>>>       i915_audio_component_get_power(kdev);
>>>>>>>> _______________________________________________
>>>>>>>> Intel-gfx mailing list
>>>>>>>> Intel-gfx at lists.freedesktop.org
>>>>>>>> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>

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