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ASoC: samsung: i2s: Add spinlock in place of local_irq_* calls

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It seems this driver hasn't been updated for SMP, as local_irq_save/
local_irq_restore don't provide proper protection of read/modify/write
of the device's registers on such systems. Introduce a spinlock
serializing access to the register region, it will be helpful later
when I2SMOD, I2SPSR registers are made also accessible through the
clk API.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sylwester Nawrocki 2015-01-14 19:42:35 +01:00 committed by Mark Brown
parent 872c26bd80
commit f36705366a
1 changed files with 13 additions and 5 deletions
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18
sound/soc/samsung/i2s.c
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@ -94,6 +94,10 @@ struct i2s_dai {
u32 suspend_i2scon;
u32 suspend_i2spsr;
const struct samsung_i2s_variant_regs *variant_regs;
/* Spinlock protecting access to the device's registers */
spinlock_t spinlock;
spinlock_t *lock;
};
/* Lock for cross i/f checks */
@ -867,10 +871,10 @@ static int i2s_trigger(struct snd_pcm_substream *substream,
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
local_irq_save(flags);
spin_lock_irqsave(i2s->lock, flags);
if (config_setup(i2s)) {
local_irq_restore(flags);
spin_unlock_irqrestore(i2s->lock, flags);
return -EINVAL;
}
@ -879,12 +883,12 @@ static int i2s_trigger(struct snd_pcm_substream *substream,
else
i2s_txctrl(i2s, 1);
local_irq_restore(flags);
spin_unlock_irqrestore(i2s->lock, flags);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
local_irq_save(flags);
spin_lock_irqsave(i2s->lock, flags);
if (capture) {
i2s_rxctrl(i2s, 0);
@ -894,7 +898,7 @@ static int i2s_trigger(struct snd_pcm_substream *substream,
i2s_fifo(i2s, FIC_TXFLUSH);
}
local_irq_restore(flags);
spin_unlock_irqrestore(i2s->lock, flags);
break;
}
@ -1157,6 +1161,9 @@ static int samsung_i2s_probe(struct platform_device *pdev)
return -ENOMEM;
}
spin_lock_init(&pri_dai->spinlock);
pri_dai->lock = &pri_dai->spinlock;
if (!np) {
res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
if (!res) {
@ -1234,6 +1241,7 @@ static int samsung_i2s_probe(struct platform_device *pdev)
return -ENOMEM;
}
sec_dai->lock = &pri_dai->spinlock;
sec_dai->variant_regs = pri_dai->variant_regs;
sec_dai->dma_playback.dma_addr = regs_base + I2STXDS;
sec_dai->dma_playback.ch_name = "tx-sec";