Alexander Sverdlin 98e1241c35 ASoC: cirrus: i2s: IRQ-based stream watchdog ... I2S controller on EP93xx seems to have undocumented HW issue. According to "EP93xx User’s Guide", controller can handle underflow and either transmit last sample or zeroes in such case until FIFO is filled again. In reality undeflow conditions seem to confuse internal state machine from time to time and the whole stream gets shifted by one byte (as captured by logic analyser on the I2S outputs). One could only hear noise instead of original stream and this continues until the FIFO is disabled and enabled again. Work this around by watching underflow interrupt and resetting I2S TX channel + fill FIFO with zero samples until DMA catches up again. This is a nasty workaround, but it works. Hence, Kconfig option to disable it in case of problems. Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>		2018-05-11 11:27:33 +09:00
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Kconfig	ASoC: cirrus: i2s: IRQ-based stream watchdog	2018-05-11 11:27:33 +09:00
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
edb93xx.c	ASoC: cirrus: i2s: Fix LRCLK configuration	2018-05-02 05:55:28 +09:00
ep93xx-ac97.c	ASoC: ep93xx-ac97: Fix platform_get_irq's error checking	2017-12-01 13:04:51 +00:00
ep93xx-i2s.c	ASoC: cirrus: i2s: IRQ-based stream watchdog	2018-05-11 11:27:33 +09:00
ep93xx-pcm.c	ASoC: dmaengine_pcm: Make FLAG_NO_RESIDUE internal	2015-04-27 19:26:07 +01:00
ep93xx-pcm.h	ASoC: ep93xx: get rid of ep93xx-pcm-audio struct device	2013-12-18 18:54:00 +00:00
simone.c	ASoC: cirrus: drop owner assignment from platform_drivers	2014-10-20 16:22:05 +02:00
snappercl15.c	ASoC: cirrus: i2s: Fix LRCLK configuration	2018-05-02 05:55:28 +09:00