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62 lines
2.3 KiB
Diff
62 lines
2.3 KiB
Diff
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From f4dac01cd9cb5b7a33fb336fbf9065dbd7e38efe Mon Sep 17 00:00:00 2001
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From: Andy Green <andy@openmoko.com>
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Date: Fri, 25 Jul 2008 23:06:15 +0100
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Subject: [PATCH] workaround-s3c24xx-i2s-stop-live-stream-stall-on-resume.patch
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Reported-by: Graeme Gregory <graeme@openmoko.org>
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Basically-solved-by: Graeme Gregory <graeme@openmoko.org>
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Graeme found a while back that on resume, IISCON register in
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s3c2442 does not show LRCK toggling in LRINDEX bit any more,
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causing s3c24xx_snd_lrsync() to timeout and return an error,
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aborting restart of any live stream that was playing at
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suspend.
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I confirmed it was true, meddled around for a bit looking
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for some magic to restart LRCK or at least the reporting of
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it, and in the end worked around it using the method noted
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by Graeme: just ignore LRCK sync if it timed out. The worst
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that could happen would be L and R swap for the duration of
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stream that was suspended into but probably not even that.
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Signed-off-by: Andy Green <andy@openmoko.com>
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---
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sound/soc/s3c24xx/s3c24xx-i2s.c | 15 +++++++++------
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1 files changed, 9 insertions(+), 6 deletions(-)
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diff --git a/sound/soc/s3c24xx/s3c24xx-i2s.c b/sound/soc/s3c24xx/s3c24xx-i2s.c
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index 1ed6afd..fce667c 100644
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--- a/sound/soc/s3c24xx/s3c24xx-i2s.c
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+++ b/sound/soc/s3c24xx/s3c24xx-i2s.c
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@@ -180,7 +180,7 @@ static void s3c24xx_snd_rxctrl(int on)
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static int s3c24xx_snd_lrsync(void)
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{
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u32 iiscon;
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- unsigned long timeout = jiffies + msecs_to_jiffies(5);
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+ int timeout = 5; /* 500us, 125 should be enough at 8kHz */
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DBG("Entered %s\n", __func__);
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@@ -286,11 +286,14 @@ static int s3c24xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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- if (!s3c24xx_snd_is_clkmaster()) {
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- ret = s3c24xx_snd_lrsync();
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- if (ret)
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- goto exit_err;
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- }
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+ if (!s3c24xx_snd_is_clkmaster())
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+ /* we ignore the return code, if it sync'd then fine,
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+ * if it didn't sync, which happens after resume the
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+ * first time when there was a live stream at suspend,
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+ * just let it timeout, the stream picks up OK after
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+ * that and LRCK is evidently working again.
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+ */
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+ s3c24xx_snd_lrsync();
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if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
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s3c24xx_snd_rxctrl(1);
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--
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1.5.6.3
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