diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0451-staging-bcm2835-audio-Add-10ms-period-constraint.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0451-staging-bcm2835-audio-Add-10ms-period-constraint.patch | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0451-staging-bcm2835-audio-Add-10ms-period-constraint.patch b/target/linux/brcm2708/patches-4.19/950-0451-staging-bcm2835-audio-Add-10ms-period-constraint.patch new file mode 100644 index 0000000000..9121f5f986 --- /dev/null +++ b/target/linux/brcm2708/patches-4.19/950-0451-staging-bcm2835-audio-Add-10ms-period-constraint.patch @@ -0,0 +1,33 @@ +From 4f25670ed874ada94086d930e3d9349b359fe089 Mon Sep 17 00:00:00 2001 +From: Takashi Iwai <tiwai@suse.de> +Date: Tue, 4 Sep 2018 17:58:46 +0200 +Subject: [PATCH 451/773] staging: bcm2835-audio: Add 10ms period constraint + +commit 93c66acaf68b5247c3121a46a71ff6a70fc1d492 upstream. + +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 <tiwai@suse.de> +Tested-by: Stefan Wahren <stefan.wahren@i2se.com> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c | 5 +++++ + 1 file changed, 5 insertions(+) + +--- 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_gen + 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); |