From 66890d53130d90df4572987b2ebcad05595f76c7 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Tue, 4 Sep 2018 17:58:46 +0200 Subject: [PATCH] staging: bcm2835-audio: Add 10ms period constraint It seems that the resolution of vc04 callback is in 10 msec; i.e. the minimal period size is also 10 msec. This patch adds the corresponding hw constraint. Signed-off-by: Takashi Iwai Tested-by: Stefan Wahren Signed-off-by: Greg Kroah-Hartman --- drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c index 9659c25..6d89db6 100644 --- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c +++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c @@ -145,6 +145,11 @@ static int snd_bcm2835_playback_open_generic( SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 16); + /* position update is in 10ms order */ + snd_pcm_hw_constraint_minmax(runtime, + SNDRV_PCM_HW_PARAM_PERIOD_TIME, + 10 * 1000, UINT_MAX); + chip->alsa_stream[idx] = alsa_stream; chip->opened |= (1 << idx); -- 2.7.4