ASoC: mediatek: Increase periods_min in capture

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In capture, there is chance that hw_ptr reported at IRQ is
a little smaller than period_size due to internal AFE buffer.
In the case of ping-pong buffer:

|xxxxxxxxxxxxxxxxxxxxxxxxxxxx--|-----------------------------|
                            hw_ptr < period_size

This available buffer will not be read since its size is smaller than
avail_min (which is period_size by default), and read thread continues
to sleep. If the next hw_ptr is just a little larger than buffer_size,
overrun occurs. One more period can hold the possible unread buffer.

Signed-off-by: Koro Chen <koro.chen@mediatek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

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Koro Chen 2015-09-14 14:51:17 +08:00 • committed by Mark Brown

parent 6ff33f3902

commit e4fba9b5be

1 changed files with 17 additions and 0 deletions

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sound/soc/mediatek/mtk-afe-pcm.c

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