linux-kernel - Re: [PATCH] ice1712: fix: lock samplerate when samplerate locking is enabled.

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Message-ID: <s5hmxzoun3x.wl%tiwai@suse.de>
Date:	Fri, 05 Feb 2010 09:02:10 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Sebastien Alaiwan <sebastien.alaiwan@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ice1712: fix: lock samplerate when samplerate locking is enabled.

At Thu, 04 Feb 2010 22:20:11 +0100,
Sebastien Alaiwan wrote:
> 
> Sebastien Alaiwan wrote:
>  Takashi Iwai wrote:
> > At Wed, 03 Feb 2010 21:45:34 +0100,
> > Sebastien Alaiwan wrote:
> >> Hello,
> >>
> >> I found that the sampling rate locking setting of the ice1712 sound driver was
> >> only half-respected : when the driver was locked to, let's say, 44100Hz, and a
> >> usermode app was requesting 48000Hz playback, the request was succesful although
> >> the soundcard would continue to run at 44100Hz.
> >>
> >> Here's a patch that will make those requests to fail.
> > Thanks, the patch looks OK.  But changing runtime->hw.rate_min and
> > rate_max would be cheaper.  It won't involve with kmalloc().
> > In theory, snd_pcm_hw_constraint*() can fail.
> >
> > Could you fix in that way and give your sign-off to merge to the
> > upstream?  (And don't forget to add me to Cc.)
> 
> Thank you for reviewing my patch. Here's an updated version according to your
> advice. You can merge to the upstream if it's okay. Sorry for the double
> mail, here's a signed-off version.
> 
> Signed-off-by: Sebastien Alaiwan <sebastien.alaiwan@...il.com>

Thanks!  Applied now (with minor coding-style fixes).


Takashi

> ------
> diff --git a/sound/pci/ice1712/ice1712.c b/sound/pci/ice1712/ice1712.c
> index c7cff6f..319df17 100644
> --- a/sound/pci/ice1712/ice1712.c
> +++ b/sound/pci/ice1712/ice1712.c
> @@ -1180,6 +1180,11 @@ static int snd_ice1712_playback_pro_open(struct snd_pcm_substream *substream)
>  	snd_pcm_set_sync(substream);
>  	snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
>  	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates);
> +	if (is_pro_rate_locked(ice))
> +	{
> +		runtime->hw.rate_min = PRO_RATE_DEFAULT;
> +		runtime->hw.rate_max = PRO_RATE_DEFAULT;
> +	}
>  
>  	if (ice->spdif.ops.open)
>  		ice->spdif.ops.open(ice, substream);
> @@ -1197,6 +1202,12 @@ static int snd_ice1712_capture_pro_open(struct snd_pcm_substream *substream)
>  	snd_pcm_set_sync(substream);
>  	snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
>  	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates);
> +	if (is_pro_rate_locked(ice))
> +	{
> +		runtime->hw.rate_min = PRO_RATE_DEFAULT;
> +		runtime->hw.rate_max = PRO_RATE_DEFAULT;
> +	}
> +
>  	return 0;
>  }
>  
> 
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