Re: [PATCH v2] ASoC: qcom: Add four speaker support on MI2S secondary

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On 09/06/2021 08:13, Srinivasa Rao Mandadapu wrote:
Add four speaker support on MI2S secondary block
by using I2S SD1 line on gpio52 pin, and add channel map
control support in the lpass-cpu audio driver.

Signed-off-by: Srinivasa Rao Mandadapu <srivasam@xxxxxxxxxxxxxx>
---
Changes Since V1:
	-- removed set_channel_map/get_channel_map implementation as default kcontrols
		added in pcm_new API.
		
  sound/soc/qcom/lpass-cpu.c    | 32 ++++++++++++++++++++++++++++++++
  sound/soc/qcom/lpass-sc7180.c |  1 +
  sound/soc/qcom/lpass.h        |  2 ++
  3 files changed, 35 insertions(+)

diff --git a/sound/soc/qcom/lpass-cpu.c b/sound/soc/qcom/lpass-cpu.c
index c62d2612e8f5..15d69e311b38 100644
--- a/sound/soc/qcom/lpass-cpu.c
+++ b/sound/soc/qcom/lpass-cpu.c
@@ -29,6 +29,14 @@
  #define LPASS_CPU_I2S_SD0_1_2_MASK	GENMASK(2, 0)
  #define LPASS_CPU_I2S_SD0_1_2_3_MASK	GENMASK(3, 0)
+/*
+ * Channel maps for Quad channel playbacks on MI2S Secondary
+ */
+static struct snd_pcm_chmap_elem lpass_quad_chmaps = {
+		.channels = 4,
+		.map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_RL,
+				SNDRV_CHMAP_FR, SNDRV_CHMAP_RR }

AFAIU, You would need an empty entry at the end of this list if not we will endup in a dereferencing memory sitting right next to this array which will lead to random memory corruptions...

Have a look at some of the examples in existing codec drivers.

Other than that patch looks good.

--srini


+};
  static int lpass_cpu_init_i2sctl_bitfields(struct device *dev,
  			struct lpaif_i2sctl *i2sctl, struct regmap *map)
  {
@@ -324,6 +332,25 @@ const struct snd_soc_dai_ops asoc_qcom_lpass_cpu_dai_ops = {
  };
  EXPORT_SYMBOL_GPL(asoc_qcom_lpass_cpu_dai_ops);
+int lpass_cpu_pcm_new(struct snd_soc_pcm_runtime *rtd,
+				struct snd_soc_dai *dai)
+{
+	int ret;
+	struct snd_soc_dai_driver *drv = dai->driver;
+	struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai);
+
+	if (drvdata->mi2s_playback_sd_mode[dai->id] == LPAIF_I2SCTL_MODE_QUAD01) {
+		ret =  snd_pcm_add_chmap_ctls(rtd->pcm, SNDRV_PCM_STREAM_PLAYBACK,
+				&lpass_quad_chmaps, drv->playback.channels_max, 0,
+				NULL);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(lpass_cpu_pcm_new);
+
  int asoc_qcom_lpass_cpu_dai_probe(struct snd_soc_dai *dai)
  {
  	struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai);
@@ -856,6 +883,11 @@ int asoc_qcom_lpass_cpu_platform_probe(struct platform_device *pdev)
  				PTR_ERR(drvdata->mi2s_bit_clk[dai_id]));
  			return PTR_ERR(drvdata->mi2s_bit_clk[dai_id]);
  		}
+		if (drvdata->mi2s_playback_sd_mode[dai_id] ==
+			LPAIF_I2SCTL_MODE_QUAD01) {
+			variant->dai_driver[dai_id].playback.channels_min = 4;
+			variant->dai_driver[dai_id].playback.channels_max = 4;
+		}
  	}
/* Allocation for i2sctl regmap fields */
diff --git a/sound/soc/qcom/lpass-sc7180.c b/sound/soc/qcom/lpass-sc7180.c
index 8c168d3c589e..77a556b27cf0 100644
--- a/sound/soc/qcom/lpass-sc7180.c
+++ b/sound/soc/qcom/lpass-sc7180.c
@@ -58,6 +58,7 @@ static struct snd_soc_dai_driver sc7180_lpass_cpu_dai_driver[] = {
  		},
  		.probe	= &asoc_qcom_lpass_cpu_dai_probe,
  		.ops    = &asoc_qcom_lpass_cpu_dai_ops,
+		.pcm_new = lpass_cpu_pcm_new,
  	}, {
  		.id = LPASS_DP_RX,
  		.name = "Hdmi",
diff --git a/sound/soc/qcom/lpass.h b/sound/soc/qcom/lpass.h
index 83b2e08ade06..623ddccdafff 100644
--- a/sound/soc/qcom/lpass.h
+++ b/sound/soc/qcom/lpass.h
@@ -259,5 +259,7 @@ void asoc_qcom_lpass_cpu_platform_shutdown(struct platform_device *pdev);
  int asoc_qcom_lpass_cpu_platform_probe(struct platform_device *pdev);
  int asoc_qcom_lpass_cpu_dai_probe(struct snd_soc_dai *dai);
  extern const struct snd_soc_dai_ops asoc_qcom_lpass_cpu_dai_ops;
+int lpass_cpu_pcm_new(struct snd_soc_pcm_runtime *rtd,
+				struct snd_soc_dai *dai);
#endif /* __LPASS_H__ */




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