linux-kernel - Re: [PATCH 3.10 16/53] ALSA: hdspm - Constrain periods to 2 on older cards

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Date:	Wed, 04 Mar 2015 11:03:32 +0100
From:	Adrian Knoth <adi@...omp.erfurt.thur.de>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
CC:	stable@...r.kernel.org, Takashi Iwai <tiwai@...e.de>
Subject: Re: [PATCH 3.10 16/53] ALSA: hdspm - Constrain periods to 2 on older
 cards

On 03/04/15 07:06, Greg Kroah-Hartman wrote:

Hi!

> 3.10-stable review patch.  If anyone has any objections, please let me know.

Right here! ;) Since this is my first interaction with the stable
branch, chances are I'm doing it wrong. Just tell me if you need the
patch in a different format (read: clone the stable repo)

For some reasons, the 3.10.x version of the patch isn't correct:


> ------------------
>
> From: Adrian Knoth <adi@...omp.erfurt.thur.de>
>
> commit f0153c3d948c1764f6c920a0675d86fc1d75813e upstream.
>
> RME RayDAT and AIO use a fixed buffer size of 16384 samples. With period
> sizes of 32-4096, this translates to 4-512 periods.
>
> The older RME cards have a variable buffer size but require exactly two
> periods.
>
> This patch enforces nperiods=2 on those cards.
>
> Signed-off-by: Adrian Knoth <adi@...omp.erfurt.thur.de>
> Signed-off-by: Takashi Iwai <tiwai@...e.de>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>
> ---
>   sound/pci/rme9652/hdspm.c |    6 ++++++
>   1 file changed, 6 insertions(+)
>
> --- a/sound/pci/rme9652/hdspm.c
> +++ b/sound/pci/rme9652/hdspm.c
> @@ -5863,6 +5863,12 @@ static int snd_hdspm_capture_open(struct
>   		snd_pcm_hw_constraint_minmax(runtime,
>   					     SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
>   					     64, 8192);
> +		snd_pcm_hw_constraint_minmax(runtime,
> +					     SNDRV_PCM_HW_PARAM_PERIODS,
> +					     2, 2);
> +		snd_pcm_hw_constraint_minmax(runtime,
> +					     SNDRV_PCM_HW_PARAM_PERIODS,
> +					     2, 2);
>   		break;
>   	}

Obviously, it doesn't make sense to do the same thing twice.

Here's how it should look: one of the constraints goes into
snd_hdspm_capture_open(), the other into snd_hdspm_capture_open().


--- 3.10.y/hdspm.c	2015-03-04 10:54:05.120849082 +0100
+++ 3.10.y-new/hdspm.c	2015-03-04 10:56:10.146020714 +0100
@@ -5789,6 +5789,9 @@ static int snd_hdspm_playback_open(struc
  		snd_pcm_hw_constraint_minmax(runtime,
  					     SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
  					     64, 8192);
+		snd_pcm_hw_constraint_minmax(runtime,
+				SNDRV_PCM_HW_PARAM_PERIODS,
+				2, 2);
  		break;
  	}

@@ -5863,6 +5866,9 @@ static int snd_hdspm_capture_open(struct
  		snd_pcm_hw_constraint_minmax(runtime,
  					     SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
  					     64, 8192);
+		snd_pcm_hw_constraint_minmax(runtime,
+				SNDRV_PCM_HW_PARAM_PERIODS,
+				2, 2);
  		break;
  	}


Cheers
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