There is no need to unmask all interrupts at I2S start. This
can cause performance issues in slower platforms.
Unmask only the interrupts for the used channels.
Signed-off-by: Jose Abreu <joabreu@xxxxxxxxxxxx>
---
Changes v2 -> v3:
* Dropped custom platform driver, using now ALSA DMA engine
* Dropped IRQ handler for I2S
* Removed pll_config functions (as suggested by Alexey Brodkin)
No changes v1 -> v2.
sound/soc/dwc/designware_i2s.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
index bff258d..3effcd1 100644
--- a/sound/soc/dwc/designware_i2s.c
+++ b/sound/soc/dwc/designware_i2s.c
@@ -147,17 +147,18 @@ static inline void i2s_clear_irqs(struct dw_i2s_dev *dev, u32 stream)
static void i2s_start(struct dw_i2s_dev *dev,
struct snd_pcm_substream *substream)
{
+ struct i2s_clk_config_data *config = &dev->config;
u32 i, irq;
i2s_write_reg(dev->i2s_base, IER, 1);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
- for (i = 0; i < 4; i++) {
+ for (i = 0; i < (config->chan_nr / 2); i++) {
irq = i2s_read_reg(dev->i2s_base, IMR(i));
i2s_write_reg(dev->i2s_base, IMR(i), irq & ~0x30);
}
i2s_write_reg(dev->i2s_base, ITER, 1);
} else {
- for (i = 0; i < 4; i++) {
+ for (i = 0; i < (config->chan_nr / 2); i++) {
irq = i2s_read_reg(dev->i2s_base, IMR(i));
i2s_write_reg(dev->i2s_base, IMR(i), irq & ~0x03);
}
--
1.9.1
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