1 files changed, 14 insertions, 9 deletions

diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index 8cb6bcf2c00f..b7733e6be192 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -464,28 +464,33 @@ static int fsl_ssi_trigger(struct snd_pcm_substream *substream, int cmd,
 
         switch (cmd) {
         case SNDRV_PCM_TRIGGER_START:
-        case SNDRV_PCM_TRIGGER_RESUME:
+                clrbits32(&ssi->scr, CCSR_SSI_SCR_SSIEN);
         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
-                        clrbits32(&ssi->scr, CCSR_SSI_SCR_SSIEN);
                         setbits32(&ssi->scr,
                                 CCSR_SSI_SCR_SSIEN | CCSR_SSI_SCR_TE);
                 } else {
-                        clrbits32(&ssi->scr, CCSR_SSI_SCR_SSIEN);
+                        long timeout = jiffies + 10;
+
                         setbits32(&ssi->scr,
                                 CCSR_SSI_SCR_SSIEN | CCSR_SSI_SCR_RE);
 
-                        /*
-                         * I think we need this delay to allow time for the SSI
-                         * to put data into its FIFO.  Without it, ALSA starts
-                         * to complain about overruns.
+                        /* Wait until the SSI has filled its FIFO. Without this
+                         * delay, ALSA complains about overruns.  When the FIFO
+                         * is full, the DMA controller initiates its first
+                         * transfer.  Until then, however, the DMA's DAR
+                         * register is zero, which translates to an
+                         * out-of-bounds pointer.  This makes ALSA think an
+                         * overrun has occurred.
                          */
-                        mdelay(1);
+                        while (!(in_be32(&ssi->sisr) & CCSR_SSI_SISR_RFF0) &&
+                               (jiffies < timeout));
+                        if (!(in_be32(&ssi->sisr) & CCSR_SSI_SISR_RFF0))
+                                return -EIO;
                 }
                 break;
 
         case SNDRV_PCM_TRIGGER_STOP:
-        case SNDRV_PCM_TRIGGER_SUSPEND:
         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                         clrbits32(&ssi->scr, CCSR_SSI_SCR_TE);