Merge branch 'audit.b3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit...

[linux-2.6] / sound / arm / pxa2xx-ac97.c

diff --git a/sound/arm/pxa2xx-ac97.c b/sound/arm/pxa2xx-ac97.c
index dda64beb202b65fccc6241e618c7a6e2f42f0c8c..599aff8290e8d42dcd4a1660bef1e064ddad661b 100644 (file)
--- a/sound/arm/pxa2xx-ac97.c
+++ b/sound/arm/pxa2xx-ac97.c
@@ -25,7 +25,7 @@
 #include <sound/initval.h>
 
 #include <asm/irq.h>
-#include <asm/semaphore.h>
+#include <linux/mutex.h>
 #include <asm/hardware.h>
 #include <asm/arch/pxa-regs.h>
 #include <asm/arch/audio.h>
@@ -33,45 +33,53 @@
 #include "pxa2xx-pcm.h"
 
 
-static DECLARE_MUTEX(car_mutex);
+static DEFINE_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;
-       }
+       mutex_lock(&car_mutex);
 
        /* 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);
+out:   mutex_unlock(&car_mutex);
        return val;
 }
 
@@ -79,24 +87,21 @@ static void pxa2xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigne
 {
        volatile u32 *reg_addr;
 
-       down(&car_mutex);
-
-       if (CAR & CAR_CAIP) {
-               printk(KERN_CRIT "%s: CAR_CAIP already set\n", __FUNCTION__);
-               goto out;
-       }
+       mutex_lock(&car_mutex);
 
        /* 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);
+       mutex_unlock(&car_mutex);
 }
 
 static void pxa2xx_ac97_reset(struct snd_ac97 *ac97)