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authorGrant Likely <grant.likely@secretlab.ca>2009-07-02 11:57:25 -0600
committerMark Brown <broonie@opensource.wolfsonmicro.com>2009-07-03 10:41:47 +0100
commit0827d6ba0b76be398a3c4298afd41f4965d2cdcb (patch)
treee0346a66b752b89381103ee50008d532d207262e /sound
parent07573534b0b030226ee5ab560e53aac7e6c0dd84 (diff)
downloadop-kernel-dev-0827d6ba0b76be398a3c4298afd41f4965d2cdcb.zip
op-kernel-dev-0827d6ba0b76be398a3c4298afd41f4965d2cdcb.tar.gz
ASoC: add locking to mpc5200-psc-ac97 driver
AC97 bus register read/write hooks need to provide locking, but the mpc5200-psc-ac97 driver does not. This patch adds a mutex around the register access routines. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Jon Smirl <jonsmirl@gmail.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/fsl/mpc5200_dma.c1
-rw-r--r--sound/soc/fsl/mpc5200_dma.h1
-rw-r--r--sound/soc/fsl/mpc5200_psc_ac97.c13
3 files changed, 14 insertions, 1 deletions
diff --git a/sound/soc/fsl/mpc5200_dma.c b/sound/soc/fsl/mpc5200_dma.c
index efec33a..f0a2d40 100644
--- a/sound/soc/fsl/mpc5200_dma.c
+++ b/sound/soc/fsl/mpc5200_dma.c
@@ -456,6 +456,7 @@ int mpc5200_audio_dma_create(struct of_device *op)
return -ENODEV;
spin_lock_init(&psc_dma->lock);
+ mutex_init(&psc_dma->mutex);
psc_dma->id = be32_to_cpu(*prop);
psc_dma->irq = irq;
psc_dma->psc_regs = regs;
diff --git a/sound/soc/fsl/mpc5200_dma.h b/sound/soc/fsl/mpc5200_dma.h
index 2000803..8d396bb 100644
--- a/sound/soc/fsl/mpc5200_dma.h
+++ b/sound/soc/fsl/mpc5200_dma.h
@@ -55,6 +55,7 @@ struct psc_dma {
unsigned int irq;
struct device *dev;
spinlock_t lock;
+ struct mutex mutex;
u32 sicr;
uint sysclk;
int imr;
diff --git a/sound/soc/fsl/mpc5200_psc_ac97.c b/sound/soc/fsl/mpc5200_psc_ac97.c
index 9b8503f..7eb5499 100644
--- a/sound/soc/fsl/mpc5200_psc_ac97.c
+++ b/sound/soc/fsl/mpc5200_psc_ac97.c
@@ -34,11 +34,14 @@ static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
int status;
unsigned int val;
+ mutex_lock(&psc_dma->mutex);
+
/* Wait for command send status zero = ready */
status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
MPC52xx_PSC_SR_CMDSEND), 100, 0);
if (status == 0) {
pr_err("timeout on ac97 bus (rdy)\n");
+ mutex_unlock(&psc_dma->mutex);
return -ENODEV;
}
@@ -54,16 +57,19 @@ static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
if (status == 0) {
pr_err("timeout on ac97 read (val) %x\n",
in_be16(&psc_dma->psc_regs->sr_csr.status));
+ mutex_unlock(&psc_dma->mutex);
return -ENODEV;
}
/* Get the data */
val = in_be32(&psc_dma->psc_regs->ac97_data);
if (((val >> 24) & 0x7f) != reg) {
pr_err("reg echo error on ac97 read\n");
+ mutex_unlock(&psc_dma->mutex);
return -ENODEV;
}
val = (val >> 8) & 0xffff;
+ mutex_unlock(&psc_dma->mutex);
return (unsigned short) val;
}
@@ -72,16 +78,21 @@ static void psc_ac97_write(struct snd_ac97 *ac97,
{
int status;
+ mutex_lock(&psc_dma->mutex);
+
/* Wait for command status zero = ready */
status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
MPC52xx_PSC_SR_CMDSEND), 100, 0);
if (status == 0) {
pr_err("timeout on ac97 bus (write)\n");
- return;
+ goto out;
}
/* Write data */
out_be32(&psc_dma->psc_regs->ac97_cmd,
((reg & 0x7f) << 24) | (val << 8));
+
+ out:
+ mutex_unlock(&psc_dma->mutex);
}
static void psc_ac97_warm_reset(struct snd_ac97 *ac97)
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