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Message-Id: <1588007614-25061-4-git-send-email-brent.lu@intel.com>
Date: Tue, 28 Apr 2020 01:13:34 +0800
From: Brent Lu <brent.lu@...el.com>
To: alsa-devel@...a-project.org
Cc: Cezary Rojewski <cezary.rojewski@...el.com>,
Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
Jie Yang <yang.jie@...ux.intel.com>,
Mark Brown <broonie@...nel.org>,
Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.com>, Ben Zhang <benzh@...omium.org>,
Mac Chiang <mac.chiang@...el.com>,
Guennadi Liakhovetski <guennadi.liakhovetski@...ux.intel.com>,
Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
Brent Lu <brent.lu@...el.com>, linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/3] ASoC: broadwell: add channel constraint
BDW boards using this machine driver supports only stereo capture and
playback. Implement a constraint to enforce it.
Signed-off-by: Brent Lu <brent.lu@...el.com>
---
sound/soc/intel/boards/broadwell.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/sound/soc/intel/boards/broadwell.c b/sound/soc/intel/boards/broadwell.c
index f9a8336..07b2cfd 100644
--- a/sound/soc/intel/boards/broadwell.c
+++ b/sound/soc/intel/boards/broadwell.c
@@ -143,6 +143,31 @@ static int broadwell_rtd_init(struct snd_soc_pcm_runtime *rtd)
}
#endif
+static const unsigned int channels[] = {
+ 2,
+};
+
+static const struct snd_pcm_hw_constraint_list constraints_channels = {
+ .count = ARRAY_SIZE(channels),
+ .list = channels,
+ .mask = 0,
+};
+
+static int broadwell_fe_startup(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ /* Board supports stereo configuration only */
+ runtime->hw.channels_max = 2;
+ return snd_pcm_hw_constraint_list(runtime, 0,
+ SNDRV_PCM_HW_PARAM_CHANNELS,
+ &constraints_channels);
+}
+
+static const struct snd_soc_ops broadwell_fe_ops = {
+ .startup = broadwell_fe_startup,
+};
+
SND_SOC_DAILINK_DEF(system,
DAILINK_COMP_ARRAY(COMP_CPU("System Pin")));
@@ -180,6 +205,7 @@ static struct snd_soc_dai_link broadwell_rt286_dais[] = {
.init = broadwell_rtd_init,
#endif
.trigger = {SND_SOC_DPCM_TRIGGER_POST, SND_SOC_DPCM_TRIGGER_POST},
+ .ops = &broadwell_fe_ops,
.dpcm_playback = 1,
.dpcm_capture = 1,
SND_SOC_DAILINK_REG(system, dummy, platform),
--
2.7.4
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