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ALSA: hdspm - Constrain periods to 2 on older cards

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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@drcomp.erfurt.thur.de>
Cc: <stable@vger.kernel.org> # 2.6.39+
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Adrian Knoth 2015-02-10 11:33:50 +01:00 committed by Takashi Iwai
parent 7976eb49cb
commit f0153c3d94
1 changed files with 6 additions and 0 deletions
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6
sound/pci/rme9652/hdspm.c
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@ -6082,6 +6082,9 @@ static int snd_hdspm_playback_open(struct snd_pcm_substream *substream)
snd_pcm_hw_constraint_minmax(runtime, snd_pcm_hw_constraint_minmax(runtime,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
64, 8192); 64, 8192);
snd_pcm_hw_constraint_minmax(runtime,
SNDRV_PCM_HW_PARAM_PERIODS,
2, 2);
break; break;
} }
@ -6156,6 +6159,9 @@ static int snd_hdspm_capture_open(struct snd_pcm_substream *substream)
snd_pcm_hw_constraint_minmax(runtime, snd_pcm_hw_constraint_minmax(runtime,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
64, 8192); 64, 8192);
snd_pcm_hw_constraint_minmax(runtime,
SNDRV_PCM_HW_PARAM_PERIODS,
2, 2);
break; break;
} }