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    Subject[PATCH 3.4 035/172] ALSA: hdspm - Constrain periods to 2 on older cards
    Date
    From: Adrian Knoth <adi@drcomp.erfurt.thur.de>

    3.4.108-rc1 review patch. If anyone has any objections, please let me know.

    ------------------


    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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