Messages in this thread Patch in this message | | | From | lizf@kernel ... | Subject | [PATCH 3.4 035/172] ALSA: hdspm - Constrain periods to 2 on older cards | Date | Tue, 16 Jun 2015 16:34:49 +0800 |
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From: Adrian Knoth <adi@drcomp.erfurt.thur.de>
3.4.108-rc1 review patch. If anyone has any objections, please let me know.
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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@drcomp.erfurt.thur.de> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Zefan Li <lizefan@huawei.com> --- sound/pci/rme9652/hdspm.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c index bc030a2..0627ffe 100644 --- a/sound/pci/rme9652/hdspm.c +++ b/sound/pci/rme9652/hdspm.c @@ -6042,6 +6042,12 @@ 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); + snd_pcm_hw_constraint_minmax(runtime, + SNDRV_PCM_HW_PARAM_PERIODS, + 2, 2); break; } -- 1.9.1
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