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....@nxp.com>
---
sound/soc/fsl/imx-rpmsg.c | 58 +++++++++++++++++++++++++++++++++++++++
1 file changed, 58 insertions(+)
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;
--
2.25.1
