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authorMisael Lopez Cruz <misael.lopez@ti.com>2014-11-12 17:38:05 +0300
committerMark Brown <broonie@kernel.org>2014-11-12 17:55:00 +0300
commita7a3324a602cd7ebabfb7f5990006ec4f3d6449f (patch)
treef77c68c09dec608db66c5e16b9010bd56359d4f4 /Documentation/ioctl/ioctl-number.txt
parent18a4f55756ac945bd89d1fe63dafe36462ecba86 (diff)
downloadlinux-a7a3324a602cd7ebabfb7f5990006ec4f3d6449f.tar.xz
ASoC: davinci-mcasp: Add overrun/underrun event handling
An underrun (playback) event occurs when the serializer transfer data from the XRBUF buffer to the XRSR shift register, but the XRBUF hasn't been filled. Similarly, the overrun (capture) event occurs when data from the XRSR shift register is transferred to the XRBUF but it hasn't been read yet. These events are handled as XRUN events that cause the pcm to stop. The stream has to be explicitly restarted by the userspace which ensures that after stopping/starting McASP the data transfer is aligned with DMA. The other possibility was to internally stop and start McASP without DMA even knowing about it. Signed-off-by: Misael Lopez Cruz <misael.lopez@ti.com> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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