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

Mika Kahola
2015-04-14T07:06:29Z

With pink noise you can't tell if the audio is played faster or slower.

I tested this by playing ITU speech codec test sample

aplay --device=plughw:0,7 male.wav

and audio played back on 1x speed.

Cheers,
Mika

On Tue, 2015-04-14 at 12:27 +0530, Sivakumar Thulasimani wrote:
> 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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> >> Intel-gfx@lists.freedesktop.org
> >> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> >
> >
> >