Re: [PATCH 15/19] drm/i915: HSW cdclk support

Sivakumar Thulasimani
2015-04-14T06:57:26Z

Thanks for the update Mika. The issue will be that audio plays faster or
slower than normal. i.e it will be < 1x or > 1x. can you confirm if
audible sound plays after CD Clock change at 1x speed ?

regards,
Sivakumar
On 4/14/2015 12:06 PM, Mika Kahola wrote:
> I tested this patch with the audio in place. With this setup in my HSW
> machine I can hear the pink noise played back with DP-HDMI cable
> attatched.
>
> speaker-test -c 2 -r 48000 -F S16_LE -t pink --device=plughw:0,7
>
> Cheers,
> Mika
>
> On Tue, 2015-04-07 at 14:06 +0530, Sivakumar Thulasimani wrote:
>> where can i check this (audio driver) ? since there was no need for them
>> to check CD clock value till now i don't think they will be doing it.
>> also this needs to be changed in Display Audio controller, so not sure
>> if audio driver has access to it in the first place. will be good to
>> confirm this before merging as it will break display audio if it is not
>> programmed.
>>
>> if any one has setup this can be confirmed by just switching CD clock
>> after boot and playing an audio file.
>>
>> regards,
>> Sivakumar
>>
>> On 4/7/2015 1:59 PM, Ville Syrjälä wrote:
>>> On Tue, Apr 07, 2015 at 12:33:40PM +0530, Sivakumar Thulasimani wrote:
>>>> sorry if i am missing something, HSW and BDW requires display audio
>>>> controller to be updated with new values once CD clock is modified. how
>>>> is this accomplished here ?
>>> I'm hoping the audio driver will query the cdclk frequency after every
>>> modeset.
>>>
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