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

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Thanks for the confirmation, Mika :). then this change is fine
not sure if it is still relevant but you can add rb if possible

Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@xxxxxxxxx>

On 4/14/2015 12:36 PM, Mika Kahola wrote:
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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