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authorJassi <jassi.brar@samsung.com>2009-09-15 19:02:37 +0900
committerMark Brown <broonie@opensource.wolfsonmicro.com>2009-09-15 13:26:14 +0100
commitfa68e0025d4184ba917621a9c977d4243d0a013e (patch)
tree6bab0f8380e5ff4446ffcbadb75039f41565e951 /sound
parent3eef08ba522775360cc59fe0a6b1bca6ecc8da4e (diff)
downloadblackbird-op-linux-fa68e0025d4184ba917621a9c977d4243d0a013e.tar.gz
blackbird-op-linux-fa68e0025d4184ba917621a9c977d4243d0a013e.zip
ASoC: S3C lrsync function made to work with IRQs disabled.
s3c2412_snd_lrsync() maybe reached with IRQs disabled and if LRCLK is dead due to improper initialization of CPU or CODEC, the system gets stuck in the loop because jiffies may never get updated. Implemented counter based wait mechanism for atleast the same timeout period. Signed-off-by: Jassi <jassi.brar@samsung.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/s3c24xx/s3c-i2s-v2.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/sound/soc/s3c24xx/s3c-i2s-v2.c b/sound/soc/s3c24xx/s3c-i2s-v2.c
index aa7af0b8d421..9bc4aa35caab 100644
--- a/sound/soc/s3c24xx/s3c-i2s-v2.c
+++ b/sound/soc/s3c24xx/s3c-i2s-v2.c
@@ -230,6 +230,8 @@ static void s3c2412_snd_rxctrl(struct s3c_i2sv2_info *i2s, int on)
pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
}
+#define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
+
/*
* Wait for the LR signal to allow synchronisation to the L/R clock
* from the codec. May only be needed for slave mode.
@@ -237,19 +239,21 @@ static void s3c2412_snd_rxctrl(struct s3c_i2sv2_info *i2s, int on)
static int s3c2412_snd_lrsync(struct s3c_i2sv2_info *i2s)
{
u32 iiscon;
- unsigned long timeout = jiffies + msecs_to_jiffies(5);
+ unsigned long loops = msecs_to_loops(5);
pr_debug("Entered %s\n", __func__);
- while (1) {
+ while (--loops) {
iiscon = readl(i2s->regs + S3C2412_IISCON);
if (iiscon & S3C2412_IISCON_LRINDEX)
break;
- if (timeout < jiffies) {
- printk(KERN_ERR "%s: timeout\n", __func__);
- return -ETIMEDOUT;
- }
+ cpu_relax();
+ }
+
+ if (!loops) {
+ printk(KERN_ERR "%s: timeout\n", __func__);
+ return -ETIMEDOUT;
}
return 0;
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