From 174eb8e8cb1ec97904ddeaae54366a03789162ef Mon Sep 17 00:00:00 2001 From: Heikki Lindholm Date: Fri, 23 Nov 2007 18:59:18 -0300 Subject: [PATCH] V4L/DVB (6666): saa7134-alsa: fix period handling The period handling in saa7134-alsa is broken in two ways. First, the minimum number of periods of two does not work, because the dma is setup two periods ahead in the irq handler. Fix the minimum to four periods. Second, the code assumes that the number of periods is divisible by two, which isn't always the case on ALSA. Fix by adding a constraint. Signed-off-by: Heikki Lindholm Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/saa7134/saa7134-alsa.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/media/video/saa7134/saa7134-alsa.c b/drivers/media/video/saa7134/saa7134-alsa.c index b9c5cf7dc849..ece177de72a5 100644 --- a/drivers/media/video/saa7134/saa7134-alsa.c +++ b/drivers/media/video/saa7134/saa7134-alsa.c @@ -457,7 +457,7 @@ static struct snd_pcm_hardware snd_card_saa7134_capture = .buffer_bytes_max = (256*1024), .period_bytes_min = 64, .period_bytes_max = (256*1024), - .periods_min = 2, + .periods_min = 4, .periods_max = 1024, }; @@ -491,7 +491,7 @@ static int snd_card_saa7134_hw_params(struct snd_pcm_substream * substream, snd_assert(period_size >= 0x100 && period_size <= 0x10000, return -EINVAL); - snd_assert(periods >= 2, return -EINVAL); + snd_assert(periods >= 4, return -EINVAL); snd_assert(period_size * periods <= 1024 * 1024, return -EINVAL); dev = saa7134->dev; @@ -647,7 +647,14 @@ static int snd_card_saa7134_capture_open(struct snd_pcm_substream * substream) saa7134_tvaudio_setmute(dev); } - if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0) + err = snd_pcm_hw_constraint_integer(runtime, + SNDRV_PCM_HW_PARAM_PERIODS); + if (err < 0) + return err; + + err = snd_pcm_hw_constraint_step(runtime, 0, + SNDRV_PCM_HW_PARAM_PERIODS, 2); + if (err < 0) return err; return 0; -- GitLab