ASoC: wm_adsp: Correct handling of compressed streams that restart

Previously support was added to allow streams to be stopped and
started again without the DSP being power cycled and this was done
by clearing the buffer state in trigger start. Another supported
use-case is using the DSP for a trigger event then opening the
compressed stream later to receive the audio, unfortunately clearing
the buffer state in trigger start destroys the data received
from such a trigger. Correct this issue by moving the call to
wm_adsp_buffer_clear to be in trigger stop instead.

Fixes: 61fc060c40e6 ("ASoC: wm_adsp: Support streams which can start/stop with DSP active")
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index b93fdc8d2d6fb76112eabc4fe2a6a302fa86b710..0de36b7eeeb2216113b03c68e6a15105e17c1014 100644 (file)
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -3571,8 +3571,6 @@ int wm_adsp_compr_trigger(struct snd_compr_stream *stream, int cmd)
                if (ret < 0)
                        break;
 
-               wm_adsp_buffer_clear(compr->buf);
-
                /* Trigger the IRQ at one fragment of data */
                ret = wm_adsp_buffer_write(compr->buf,
                                           HOST_BUFFER_FIELD(high_water_mark),
@@ -3584,6 +3582,7 @@ int wm_adsp_compr_trigger(struct snd_compr_stream *stream, int cmd)
                }
                break;
        case SNDRV_PCM_TRIGGER_STOP:
+               wm_adsp_buffer_clear(compr->buf);
                break;
        default:
                ret = -EINVAL;