diff mbox series

[v4,2/2] ASoC: imx-rpmsg: Force codec power on in low power audio mode

Message ID 20231023020718.1276000-2-chancel.liu@nxp.com (mailing list archive)
State Handled Elsewhere
Headers show
Series [v4,1/2] ASoC: dt-bindings: sound-card-common: List sound widgets ignoring system suspend | expand

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Commit Message

Chancel Liu Oct. 23, 2023, 2:07 a.m. UTC 
Low power audio mode requires binding codec still power on while Acore
enters into suspend so Mcore can continue playback music.

ASoC machine driver acquires DAPM endpoints through reading
"ignore-suspend-widgets" property from DT and then forces the path
between these endpoints ignoring suspend.

If the rpmsg sound card is in low power audio mode, the suspend/resume
callback of binding codec is overridden to disable the suspend/resume.

Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
---
 sound/soc/fsl/imx-rpmsg.c | 58 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

Comments

Mark Brown Nov. 20, 2023, 10:07 p.m. UTC | #1 
On Mon, Oct 23, 2023 at 10:07:18AM +0800, Chancel Liu wrote:
> Low power audio mode requires binding codec still power on while Acore
> enters into suspend so Mcore can continue playback music.
> 
> ASoC machine driver acquires DAPM endpoints through reading
> "ignore-suspend-widgets" property from DT and then forces the path
> between these endpoints ignoring suspend.

This breaks an x86 allmodconfig build:

/build/stage/linux/sound/soc/fsl/imx-rpmsg.c: In function ‘imx_rpmsg_late_probe’
:
/build/stage/linux/sound/soc/fsl/imx-rpmsg.c:60:46: error: implicit declaration 
of function ‘of_find_device_by_node’; did you mean ‘of_find_i2c_device_by_node’?
 [-Werror=implicit-function-declaration]
   60 |                                 codec_pdev = of_find_device_by_node(code
c_np);
      |                                              ^~~~~~~~~~~~~~~~~~~~~~
      |                                              of_find_i2c_device_by_node
/build/stage/linux/sound/soc/fsl/imx-rpmsg.c:60:44: error: assignment to ‘struct
 platform_device *’ from ‘int’ makes pointer from integer without a cast [-Werro
r=int-conversion]
   60 |                                 codec_pdev = of_find_device_by_node(codec_np);
      |                                            ^
cc1: all warnings being treated as errors
diff mbox series

Patch

diff --git a/sound/soc/fsl/imx-rpmsg.c b/sound/soc/fsl/imx-rpmsg.c
index a9324712e3fa..e5bd63dab10c 100644
--- a/sound/soc/fsl/imx-rpmsg.c
+++ b/sound/soc/fsl/imx-rpmsg.c
@@ -20,8 +20,11 @@  struct imx_rpmsg {
 	struct snd_soc_dai_link dai;
 	struct snd_soc_card card;
 	unsigned long sysclk;
+	bool lpa;
 };
 
+static struct dev_pm_ops lpa_pm;
+
 static const struct snd_soc_dapm_widget imx_rpmsg_dapm_widgets[] = {
 	SND_SOC_DAPM_HP("Headphone Jack", NULL),
 	SND_SOC_DAPM_SPK("Ext Spk", NULL),
@@ -38,6 +41,58 @@  static int imx_rpmsg_late_probe(struct snd_soc_card *card)
 	struct device *dev = card->dev;
 	int ret;
 
+	if (data->lpa) {
+		struct snd_soc_component *codec_comp;
+		struct device_node *codec_np;
+		struct device_driver *codec_drv;
+		struct device *codec_dev = NULL;
+
+		codec_np = data->dai.codecs->of_node;
+		if (codec_np) {
+			struct platform_device *codec_pdev;
+			struct i2c_client *codec_i2c;
+
+			codec_i2c = of_find_i2c_device_by_node(codec_np);
+			if (codec_i2c)
+				codec_dev = &codec_i2c->dev;
+			if (!codec_dev) {
+				codec_pdev = of_find_device_by_node(codec_np);
+				if (codec_pdev)
+					codec_dev = &codec_pdev->dev;
+			}
+		}
+		if (codec_dev) {
+			codec_comp = snd_soc_lookup_component_nolocked(codec_dev, NULL);
+			if (codec_comp) {
+				int i, num_widgets;
+				const char *widgets;
+				struct snd_soc_dapm_context *dapm;
+
+				num_widgets = of_property_count_strings(data->card.dev->of_node,
+									"ignore-suspend-widgets");
+				for (i = 0; i < num_widgets; i++) {
+					of_property_read_string_index(data->card.dev->of_node,
+								      "ignore-suspend-widgets",
+								      i, &widgets);
+					dapm = snd_soc_component_get_dapm(codec_comp);
+					snd_soc_dapm_ignore_suspend(dapm, widgets);
+				}
+			}
+			codec_drv = codec_dev->driver;
+			if (codec_drv->pm) {
+				memcpy(&lpa_pm, codec_drv->pm, sizeof(lpa_pm));
+				lpa_pm.suspend = NULL;
+				lpa_pm.resume = NULL;
+				lpa_pm.freeze = NULL;
+				lpa_pm.thaw = NULL;
+				lpa_pm.poweroff = NULL;
+				lpa_pm.restore = NULL;
+				codec_drv->pm = &lpa_pm;
+			}
+			put_device(codec_dev);
+		}
+	}
+
 	if (!data->sysclk)
 		return 0;
 
@@ -137,6 +192,9 @@  static int imx_rpmsg_probe(struct platform_device *pdev)
 		goto fail;
 	}
 
+	if (of_property_read_bool(np, "fsl,enable-lpa"))
+		data->lpa = true;
+
 	data->card.dev = &pdev->dev;
 	data->card.owner = THIS_MODULE;
 	data->card.dapm_widgets = imx_rpmsg_dapm_widgets;