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Commit f0153c3d authored by Adrian Knoth's avatar Adrian Knoth Committed by Takashi Iwai
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ALSA: hdspm - Constrain periods to 2 on older cards 



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: default avatarAdrian Knoth <adi@drcomp.erfurt.thur.de>
Cc: <stable@vger.kernel.org> # 2.6.39+
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 7976eb49

sound/pci/rme9652/hdspm.c

+6 −0
Original line number Diff line number Diff line
@@ -6082,6 +6082,9 @@ static int snd_hdspm_playback_open(struct snd_pcm_substream *substream) 
		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;

	}
@@ -6156,6 +6159,9 @@ static int snd_hdspm_capture_open(struct snd_pcm_substream *substream) 
		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;

	}