ALSA: hda - Don't reset stream at each prepare callback
Don't reset the stream at each prepare callback but do it only once
after the open.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index ba97795..8b2e416 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -859,13 +859,18 @@
SD_CTL_DMA_START | SD_INT_MASK);
}
-/* stop a stream */
-static void azx_stream_stop(struct azx *chip, struct azx_dev *azx_dev)
+/* stop DMA */
+static void azx_stream_clear(struct azx *chip, struct azx_dev *azx_dev)
{
- /* stop DMA */
azx_sd_writeb(azx_dev, SD_CTL, azx_sd_readb(azx_dev, SD_CTL) &
~(SD_CTL_DMA_START | SD_INT_MASK));
azx_sd_writeb(azx_dev, SD_STS, SD_INT_MASK); /* to be sure */
+}
+
+/* stop a stream */
+static void azx_stream_stop(struct azx *chip, struct azx_dev *azx_dev)
+{
+ azx_stream_clear(chip, azx_dev);
/* disable SIE */
azx_writeb(chip, INTCTL,
azx_readb(chip, INTCTL) & ~(1 << azx_dev->index));
@@ -1126,18 +1131,14 @@
return -EINVAL;
}
-/*
- * set up the SD for streaming
- */
-static int azx_setup_controller(struct azx *chip, struct azx_dev *azx_dev)
+/* reset stream */
+static void azx_stream_reset(struct azx *chip, struct azx_dev *azx_dev)
{
unsigned char val;
int timeout;
- /* make sure the run bit is zero for SD */
- azx_sd_writeb(azx_dev, SD_CTL, azx_sd_readb(azx_dev, SD_CTL) &
- ~SD_CTL_DMA_START);
- /* reset stream */
+ azx_stream_clear(chip, azx_dev);
+
azx_sd_writeb(azx_dev, SD_CTL, azx_sd_readb(azx_dev, SD_CTL) |
SD_CTL_STREAM_RESET);
udelay(3);
@@ -1154,7 +1155,15 @@
while (((val = azx_sd_readb(azx_dev, SD_CTL)) & SD_CTL_STREAM_RESET) &&
--timeout)
;
+}
+/*
+ * set up the SD for streaming
+ */
+static int azx_setup_controller(struct azx *chip, struct azx_dev *azx_dev)
+{
+ /* make sure the run bit is zero for SD */
+ azx_stream_clear(chip, azx_dev);
/* program the stream_tag */
azx_sd_writel(azx_dev, SD_CTL,
(azx_sd_readl(azx_dev, SD_CTL) & ~SD_CTL_STREAM_TAG_MASK)|
@@ -1399,6 +1408,8 @@
runtime->private_data = azx_dev;
snd_pcm_set_sync(substream);
mutex_unlock(&chip->open_mutex);
+
+ azx_stream_reset(chip, azx_dev);
return 0;
}