intel_sst: MRST can only do 16bit recording

Fix bug

	$ arecord -D dsnoop -r 48000 -f S16_LE 1.wav
	ALSA lib pcm_direct.c:980:(snd1_pcm_direct_initialize_slave) unable to install hw params
	ALSA lib pcm_dsnoop.c:604:(snd_pcm_dsnoop_open) unable to initialize slave
	arecord: main:654: audio open error: Interrupted system call

Root cause is, the driver is reporting 32-bit capture capability
that is not supported by the MRST hardware. So the dsnoop plugin
end up requesting 32-bit capture which fails.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/intel_sst/intelmid.c b/drivers/staging/intel_sst/intelmid.c
index 0b9b1b64c9c4c006646757ed0e51691986a51040..cbe09f2bde39dc7403c0758b53440a21ec4869ef 100644 (file)
--- a/drivers/staging/intel_sst/intelmid.c
+++ b/drivers/staging/intel_sst/intelmid.c
@@ -339,8 +339,11 @@ static int snd_intelmad_open(struct snd_pcm_substream *substream,
                /*
                 * MRST firmware currently denies stereo recording requests.
                 */
-               if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+               if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
+                       runtime->hw.formats = (SNDRV_PCM_FMTBIT_S16 |
+                                              SNDRV_PCM_FMTBIT_U16);
                        runtime->hw.channels_max = 1;
+               }
        }
        if (intelmaddata->cpu_id == CPU_CHIP_PENWELL) {
                runtime->hw = snd_intelmad_stream;