ASoC: dwc: Unmask I2S interrupts only for enabled channels

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@synopsys.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
index bff258d7bcea1f380403df5b9380ac7c9aabf835..3effcd1a7df87916dde162e039bc97c27b0596b1 100644 (file)
--- 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);
                }