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authorGrant Likely <grant.likely@secretlab.ca>2009-07-02 13:57:25 -0400
committerMark Brown <broonie@opensource.wolfsonmicro.com>2009-07-03 05:41:47 -0400
commit0827d6ba0b76be398a3c4298afd41f4965d2cdcb (patch)
treee0346a66b752b89381103ee50008d532d207262e /sound
parent07573534b0b030226ee5ab560e53aac7e6c0dd84 (diff)
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 efec33a1c5bd..f0a2d4071998 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)
456 return -ENODEV; 456 return -ENODEV;
457 457
458 spin_lock_init(&psc_dma->lock); 458 spin_lock_init(&psc_dma->lock);
459 mutex_init(&psc_dma->mutex);
459 psc_dma->id = be32_to_cpu(*prop); 460 psc_dma->id = be32_to_cpu(*prop);
460 psc_dma->irq = irq; 461 psc_dma->irq = irq;
461 psc_dma->psc_regs = regs; 462 psc_dma->psc_regs = regs;
diff --git a/sound/soc/fsl/mpc5200_dma.h b/sound/soc/fsl/mpc5200_dma.h
index 2000803f06a7..8d396bb9d9fe 100644
--- a/sound/soc/fsl/mpc5200_dma.h
+++ b/sound/soc/fsl/mpc5200_dma.h
@@ -55,6 +55,7 @@ struct psc_dma {
55 unsigned int irq; 55 unsigned int irq;
56 struct device *dev; 56 struct device *dev;
57 spinlock_t lock; 57 spinlock_t lock;
58 struct mutex mutex;
58 u32 sicr; 59 u32 sicr;
59 uint sysclk; 60 uint sysclk;
60 int imr; 61 int imr;
diff --git a/sound/soc/fsl/mpc5200_psc_ac97.c b/sound/soc/fsl/mpc5200_psc_ac97.c
index 9b8503f2d68c..7eb549985d49 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)
34 int status; 34 int status;
35 unsigned int val; 35 unsigned int val;
36 36
37 mutex_lock(&psc_dma->mutex);
38
37 /* Wait for command send status zero = ready */ 39 /* Wait for command send status zero = ready */
38 status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) & 40 status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
39 MPC52xx_PSC_SR_CMDSEND), 100, 0); 41 MPC52xx_PSC_SR_CMDSEND), 100, 0);
40 if (status == 0) { 42 if (status == 0) {
41 pr_err("timeout on ac97 bus (rdy)\n"); 43 pr_err("timeout on ac97 bus (rdy)\n");
44 mutex_unlock(&psc_dma->mutex);
42 return -ENODEV; 45 return -ENODEV;
43 } 46 }
44 47
@@ -54,16 +57,19 @@ static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
54 if (status == 0) { 57 if (status == 0) {
55 pr_err("timeout on ac97 read (val) %x\n", 58 pr_err("timeout on ac97 read (val) %x\n",
56 in_be16(&psc_dma->psc_regs->sr_csr.status)); 59 in_be16(&psc_dma->psc_regs->sr_csr.status));
60 mutex_unlock(&psc_dma->mutex);
57 return -ENODEV; 61 return -ENODEV;
58 } 62 }
59 /* Get the data */ 63 /* Get the data */
60 val = in_be32(&psc_dma->psc_regs->ac97_data); 64 val = in_be32(&psc_dma->psc_regs->ac97_data);
61 if (((val >> 24) & 0x7f) != reg) { 65 if (((val >> 24) & 0x7f) != reg) {
62 pr_err("reg echo error on ac97 read\n"); 66 pr_err("reg echo error on ac97 read\n");
67 mutex_unlock(&psc_dma->mutex);
63 return -ENODEV; 68 return -ENODEV;
64 } 69 }
65 val = (val >> 8) & 0xffff; 70 val = (val >> 8) & 0xffff;
66 71
72 mutex_unlock(&psc_dma->mutex);
67 return (unsigned short) val; 73 return (unsigned short) val;
68} 74}
69 75
@@ -72,16 +78,21 @@ static void psc_ac97_write(struct snd_ac97 *ac97,
72{ 78{
73 int status; 79 int status;
74 80
81 mutex_lock(&psc_dma->mutex);
82
75 /* Wait for command status zero = ready */ 83 /* Wait for command status zero = ready */
76 status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) & 84 status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
77 MPC52xx_PSC_SR_CMDSEND), 100, 0); 85 MPC52xx_PSC_SR_CMDSEND), 100, 0);
78 if (status == 0) { 86 if (status == 0) {
79 pr_err("timeout on ac97 bus (write)\n"); 87 pr_err("timeout on ac97 bus (write)\n");
80 return; 88 goto out;
81 } 89 }
82 /* Write data */ 90 /* Write data */
83 out_be32(&psc_dma->psc_regs->ac97_cmd, 91 out_be32(&psc_dma->psc_regs->ac97_cmd,
84 ((reg & 0x7f) << 24) | (val << 8)); 92 ((reg & 0x7f) << 24) | (val << 8));
93
94 out:
95 mutex_unlock(&psc_dma->mutex);
85} 96}
86 97
87static void psc_ac97_warm_reset(struct snd_ac97 *ac97) 98static void psc_ac97_warm_reset(struct snd_ac97 *ac97)