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From: Brent Lu <brent.lu@intel.com>
To: alsa-devel@alsa-project.org
Cc: cezary.rojewski@intel.com, pierre-louis.bossart@linux.intel.com,
	liam.r.girdwood@linux.intel.com, yang.jie@linux.intel.com,
	broonie@kernel.org, perex@perex.cz, tiwai@suse.com,
	brent.lu@intel.com, kuninori.morimoto.gx@renesas.com,
	tglx@linutronix.de, linux-kernel@vger.kernel.org
Subject: [PATCH] ASoC: bdw-rt5677: channel constraint support
Date: Fri,  6 Sep 2019 09:24:18 +0800	[thread overview]
Message-ID: <1567733058-9561-1-git-send-email-brent.lu@intel.com> (raw)

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>
---
 sound/soc/intel/boards/bdw-rt5677.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/sound/soc/intel/boards/bdw-rt5677.c b/sound/soc/intel/boards/bdw-rt5677.c
index 4a4d335..a312b55 100644
--- a/sound/soc/intel/boards/bdw-rt5677.c
+++ b/sound/soc/intel/boards/bdw-rt5677.c
@@ -22,6 +22,8 @@
 
 #include "../../codecs/rt5677.h"
 
+#define DUAL_CHANNEL 2
+
 struct bdw_rt5677_priv {
 	struct gpio_desc *gpio_hp_en;
 	struct snd_soc_component *component;
@@ -245,6 +247,36 @@ static int bdw_rt5677_init(struct snd_soc_pcm_runtime *rtd)
 	return 0;
 }
 
+static const unsigned int channels[] = {
+	DUAL_CHANNEL,
+};
+
+static const struct snd_pcm_hw_constraint_list constraints_channels = {
+	.count = ARRAY_SIZE(channels),
+	.list = channels,
+	.mask = 0,
+};
+
+static int bdw_fe_startup(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	/*
+	 * On this platform for PCM device we support,
+	 * stereo
+	 */
+
+	runtime->hw.channels_max = DUAL_CHANNEL;
+	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
+					   &constraints_channels);
+
+	return 0;
+}
+
+static const struct snd_soc_ops bdw_rt5677_fe_ops = {
+	.startup = bdw_fe_startup,
+};
+
 /* broadwell digital audio interface glue - connects codec <--> CPU */
 SND_SOC_DAILINK_DEF(dummy,
 	DAILINK_COMP_ARRAY(COMP_DUMMY()));
@@ -273,6 +305,7 @@ static struct snd_soc_dai_link bdw_rt5677_dais[] = {
 		},
 		.dpcm_capture = 1,
 		.dpcm_playback = 1,
+		.ops = &bdw_rt5677_fe_ops,
 		SND_SOC_DAILINK_REG(fe, dummy, platform),
 	},
 
-- 
2.7.4


             reply	other threads:[~2019-09-06  1:27 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-06  1:24 Brent Lu [this message]
2019-09-06 14:20 ` [alsa-devel] " Pierre-Louis Bossart
2019-09-09  6:34   ` Lu, Brent
2019-09-09 17:53     ` Pierre-Louis Bossart
2019-09-10  8:28       ` Lu, Brent
2019-09-10 14:12         ` Pierre-Louis Bossart
2019-09-12  6:00           ` Lu, Brent
2019-09-12 13:06             ` Pierre-Louis Bossart
2019-09-27 12:34               ` Lu, Brent

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