From ad18763f46835b768714ac6de6dcf42384a261ca Mon Sep 17 00:00:00 2001
From: Brent Lu <brent.lu@intel.com>
Date: Tue, 28 Apr 2020 01:13:34 +0800
Subject: [PATCH] ASoC: broadwell: add channel constraint
Git-commit: ad18763f46835b768714ac6de6dcf42384a261ca
Patch-mainline: v5.8-rc1
References: jsc#SLE-16518
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@intel.com>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/1588007614-25061-4-git-send-email-brent.lu@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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 f9a8336a0541..07b2cfdadaeb 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),
--
2.16.4