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-rw-r--r--sound/arm/pxa2xx-ac97.c39
1 files changed, 22 insertions, 17 deletions
diff --git a/sound/arm/pxa2xx-ac97.c b/sound/arm/pxa2xx-ac97.c
index dda64beb202b..3acbc6023d19 100644
--- a/sound/arm/pxa2xx-ac97.c
+++ b/sound/arm/pxa2xx-ac97.c
@@ -37,39 +37,47 @@ static DECLARE_MUTEX(car_mutex);
static DECLARE_WAIT_QUEUE_HEAD(gsr_wq);
static volatile long gsr_bits;
+/*
+ * Beware PXA27x bugs:
+ *
+ * o Slot 12 read from modem space will hang controller.
+ * o CDONE, SDONE interrupt fails after any slot 12 IO.
+ *
+ * We therefore have an hybrid approach for waiting on SDONE (interrupt or
+ * 1 jiffy timeout if interrupt never comes).
+ */
+
static unsigned short pxa2xx_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
{
unsigned short val = -1;
volatile u32 *reg_addr;
down(&car_mutex);
- if (CAR & CAR_CAIP) {
- printk(KERN_CRIT"%s: CAR_CAIP already set\n", __FUNCTION__);
- goto out;
- }
/* set up primary or secondary codec space */
reg_addr = (ac97->num & 1) ? &SAC_REG_BASE : &PAC_REG_BASE;
reg_addr += (reg >> 1);
/* start read access across the ac97 link */
+ GSR = GSR_CDONE | GSR_SDONE;
gsr_bits = 0;
val = *reg_addr;
if (reg == AC97_GPIO_STATUS)
goto out;
- wait_event_timeout(gsr_wq, gsr_bits & GSR_SDONE, 1);
- if (!gsr_bits & GSR_SDONE) {
+ if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1) <= 0 &&
+ !((GSR | gsr_bits) & GSR_SDONE)) {
printk(KERN_ERR "%s: read error (ac97_reg=%d GSR=%#lx)\n",
- __FUNCTION__, reg, gsr_bits);
+ __FUNCTION__, reg, GSR | gsr_bits);
val = -1;
goto out;
}
/* valid data now */
+ GSR = GSR_CDONE | GSR_SDONE;
gsr_bits = 0;
val = *reg_addr;
/* but we've just started another cycle... */
- wait_event_timeout(gsr_wq, gsr_bits & GSR_SDONE, 1);
+ wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1);
out: up(&car_mutex);
return val;
@@ -81,22 +89,19 @@ static void pxa2xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigne
down(&car_mutex);
- if (CAR & CAR_CAIP) {
- printk(KERN_CRIT "%s: CAR_CAIP already set\n", __FUNCTION__);
- goto out;
- }
-
/* set up primary or secondary codec space */
reg_addr = (ac97->num & 1) ? &SAC_REG_BASE : &PAC_REG_BASE;
reg_addr += (reg >> 1);
+
+ GSR = GSR_CDONE | GSR_SDONE;
gsr_bits = 0;
*reg_addr = val;
- wait_event_timeout(gsr_wq, gsr_bits & GSR_CDONE, 1);
- if (!gsr_bits & GSR_SDONE)
+ if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_CDONE, 1) <= 0 &&
+ !((GSR | gsr_bits) & GSR_CDONE))
printk(KERN_ERR "%s: write error (ac97_reg=%d GSR=%#lx)\n",
- __FUNCTION__, reg, gsr_bits);
+ __FUNCTION__, reg, GSR | gsr_bits);
-out: up(&car_mutex);
+ up(&car_mutex);
}
static void pxa2xx_ac97_reset(struct snd_ac97 *ac97)