Commit 3ca13bdb authored by Wu Fengguang's avatar Wu Fengguang Committed by Greg Kroah-Hartman
Browse files

intel_sst: MRST can only do mono recording 



Fix bug

	$ arecord -Dplughw -c2
	Recording WAVE 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Stereo
	arecord: set_params:1116: Unable to install hw params:
	ACCESS:  RW_INTERLEAVED
	FORMAT:  U8
	SUBFORMAT:  STD
	SAMPLE_BITS: 8
	FRAME_BITS: 16
	CHANNELS: 2
	[...]

Root cause is, the driver is reporting 2-channel capture capability
that is not supported by the MRST hardware. So the plughw plugin
end up requesting 2-channel capture which fails.

Signed-off-by: default avatarWu Fengguang <fengguang.wu@intel.com>
Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent f2b5ea1f

drivers/staging/intel_sst/intelmid.c

+7 −0
Original line number Diff line number Diff line
@@ -335,6 +335,13 @@ static int snd_intelmad_open(struct snd_pcm_substream *substream, 
	runtime = substream->runtime;

	/* set the runtime hw parameter with local snd_pcm_hardware struct */

	runtime->hw = snd_intelmad_stream;

	if (intelmaddata->cpu_id == CPU_CHIP_LINCROFT) {

		/*

		 * MRST firmware currently denies stereo recording requests.

		 */

		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)

			runtime->hw.channels_max = 1;

	}

	if (intelmaddata->cpu_id == CPU_CHIP_PENWELL) {

		runtime->hw = snd_intelmad_stream;

		runtime->hw.rates = SNDRV_PCM_RATE_48000;