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(stable-branch of Openmoko) git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13613 3c298f89-4303-0410-b956-a3cf2f4a3e73
58 lines
1.7 KiB
Diff
58 lines
1.7 KiB
Diff
From 5d6f04132cb5bd8fa8f1c9c9c3dc337aeae18f4c Mon Sep 17 00:00:00 2001
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From: Werner Almesberger <werner@openmoko.org>
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Date: Sun, 13 Apr 2008 07:25:55 +0100
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Subject: [PATCH] audio-tickless-timeout.patch
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When we resume, we can end up in
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sound/soc/s3c24xx/s3c24xx-i2s.c:s3c24xx_snd_lrsync
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with the timer tick still disabled, and the LR signal never happening.
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Thus, we loop forever.
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The patch below changes the timeout mechanism to use udelay, which
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doesn't need timer ticks.
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Note that this code is in a module, so to get the fix, you have to
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build the modules, and update them.
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The kernel now resumes but does the ugly GSM modem ticking. I'll have
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to find a good place to turn that one off ...
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- Werner
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---------------------------------- cut here -----------------------------------
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- sound/soc/s3c24xx/s3c24xx-i2s.c (s3c24xx_snd_lrsync): in resume, we may
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call s3c24xx_snd_lrsync with timer ticks disabled, thus jiffies never
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change. Use udelay to avoid this problem.
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---
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sound/soc/s3c24xx/s3c24xx-i2s.c | 5 +++--
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1 files changed, 3 insertions(+), 2 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 4d74cc0..43fd25a 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 = 50; /* 5ms */
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DBG("Entered %s\n", __FUNCTION__);
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@@ -189,8 +189,9 @@ static int s3c24xx_snd_lrsync(void)
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if (iiscon & S3C2410_IISCON_LRINDEX)
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break;
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- if (timeout < jiffies)
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+ if (!--timeout)
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return -ETIMEDOUT;
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+ udelay(100);
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}
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return 0;
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--
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1.5.6.5
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