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ASoC: imx-rpmsg: Force codec power on in low power audio mode 

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>
Link: https://lore.kernel.org/r/20231121052512.20235-2-chancel.liu@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Chancel Liu 2023-11-21 13:25:12 +08:00 committed by Mark Brown
parent 27c69d7da1
commit 5d9f746ca6
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 59 additions and 2 deletions
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61
sound/soc/fsl/imx-rpmsg.c
View File

@ -2,9 +2,8 @@
// Copyright 2017-2020 NXP
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_reserved_mem.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/of_gpio.h>
#include <linux/slab.h>
@ -21,8 +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),
@ -39,6 +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;
@ -138,6 +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;