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 (file)
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -859,13 +859,18 @@ static void azx_stream_start(struct azx *chip, struct azx_dev *azx_dev)
                      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 @@ static int azx_setup_periods(struct azx *chip,
        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 @@ static int azx_setup_controller(struct azx *chip, struct azx_dev *azx_dev)
        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 @@ static int azx_pcm_open(struct snd_pcm_substream *substream)
        runtime->private_data = azx_dev;
        snd_pcm_set_sync(substream);
        mutex_unlock(&chip->open_mutex);
+
+       azx_stream_reset(chip, azx_dev);
        return 0;
 }