ALSA: AC97: add full duplex support for atmel AT91 and AVR.

This patch add full duplex support on AT91 and AVR.
It was a bug: we needed to check first if there are some chips opened so we
could enable both reception and sending of the data.

Signed-off-by: Sedji Gaouaou <sedji.gaouaou@atmel.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 12 insertions, 4 deletions

diff --git a/sound/atmel/ac97c.c b/sound/atmel/ac97c.c
index 3c0a6f4e3585..428121a7e705 100644
--- a/sound/atmel/ac97c.c
+++ b/sound/atmel/ac97c.c
@@ -339,7 +339,11 @@ static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
         ac97c_writel(chip, OCA, word);
 
         /* configure sample format and size */
-        word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
+        word = ac97c_readl(chip, CAMR);
+        if (chip->opened <= 1)
+                word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
+        else
+                word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
 
         switch (runtime->format) {
         case SNDRV_PCM_FORMAT_S16_LE:
@@ -426,7 +430,11 @@ static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
         ac97c_writel(chip, ICA, word);
 
         /* configure sample format and size */
-        word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
+        word = ac97c_readl(chip, CAMR);
+        if (chip->opened <= 1)
+                word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
+        else
+                word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
 
         switch (runtime->format) {
         case SNDRV_PCM_FORMAT_S16_LE:
@@ -506,7 +514,7 @@ atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
                 } else {
                         ptcr = ATMEL_PDC_TXTEN;
                 }
-                camr |= AC97C_CMR_CENA;
+                camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX;
                 break;
         case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
         case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
@@ -551,7 +559,7 @@ atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
                 } else {
                         ptcr = ATMEL_PDC_RXTEN;
                 }
-                camr |= AC97C_CMR_CENA;
+                camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX;
                 break;
         case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
         case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */