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34 lines
1.1 KiB
Diff
34 lines
1.1 KiB
Diff
From daa78c198ece1ec901ee565c869ee1a60a95061d Mon Sep 17 00:00:00 2001
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From: Takashi Iwai <tiwai@suse.de>
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Date: Tue, 4 Sep 2018 17:58:46 +0200
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Subject: [PATCH 450/806] staging: bcm2835-audio: Add 10ms period constraint
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commit 93c66acaf68b5247c3121a46a71ff6a70fc1d492 upstream.
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It seems that the resolution of vc04 callback is in 10 msec; i.e. the
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minimal period size is also 10 msec.
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This patch adds the corresponding hw constraint.
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Signed-off-by: Takashi Iwai <tiwai@suse.de>
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Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c | 5 +++++
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1 file changed, 5 insertions(+)
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--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
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+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
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@@ -145,6 +145,11 @@ static int snd_bcm2835_playback_open_gen
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SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
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16);
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+ /* position update is in 10ms order */
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+ snd_pcm_hw_constraint_minmax(runtime,
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+ SNDRV_PCM_HW_PARAM_PERIOD_TIME,
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+ 10 * 1000, UINT_MAX);
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+
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chip->alsa_stream[idx] = alsa_stream;
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chip->opened |= (1 << idx);
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