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ALSA: hda/tegra: implement runtime suspend/resume

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This patch moves clock enable/disable from system resume/suspend to
runtime resume/suspend respectively. Along with this hda controller
chip init or stop is also moved. System resume/suspend can invoke
runtime callbacks and do necessary setup.

chip->running can be used to check for probe completion and device
access during runtime_resume or runtime_suspend can be avoided if
probe is not yet finished. This helps to avoid kernel panic during
boot where runtime PM callbacks can happen from system PM.

Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Reviewed-by: Ravindra Lokhande <rlokhande@nvidia.com>
Reviewed-by: Mohan Kumar D <mkumard@nvidia.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Sameer Pujar 2019-01-22 13:03:20 +05:30 committed by Takashi Iwai
parent 091aa42053
commit 707e0759f2
1 changed files with 33 additions and 16 deletions
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49
sound/pci/hda/hda_tegra.c
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@ -233,32 +233,24 @@ static void hda_tegra_disable_clocks(struct hda_tegra *data)
static int hda_tegra_suspend(struct device *dev)
{
struct snd_card *card = dev_get_drvdata(dev);
struct azx *chip = card->private_data;
struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);
struct hdac_bus *bus = azx_bus(chip);
int rc;
rc = pm_runtime_force_suspend(dev);
if (rc < 0)
return rc;
snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
azx_stop_chip(chip);
synchronize_irq(bus->irq);
azx_enter_link_reset(chip);
hda_tegra_disable_clocks(hda);
return 0;
}
static int hda_tegra_resume(struct device *dev)
{
struct snd_card *card = dev_get_drvdata(dev);
struct azx *chip = card->private_data;
struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);
hda_tegra_enable_clocks(hda);
hda_tegra_init(hda);
azx_init_chip(chip, 1);
int rc;
rc = pm_runtime_force_resume(dev);
if (rc < 0)
return rc;
snd_power_change_state(card, SNDRV_CTL_POWER_D0);
return 0;
@ -268,11 +260,36 @@ static int hda_tegra_resume(struct device *dev)
#ifdef CONFIG_PM
static int hda_tegra_runtime_suspend(struct device *dev)
{
struct snd_card *card = dev_get_drvdata(dev);
struct azx *chip = card->private_data;
struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);
struct hdac_bus *bus = azx_bus(chip);
if (chip && chip->running) {
azx_stop_chip(chip);
synchronize_irq(bus->irq);
azx_enter_link_reset(chip);
}
hda_tegra_disable_clocks(hda);
return 0;
}
static int hda_tegra_runtime_resume(struct device *dev)
{
struct snd_card *card = dev_get_drvdata(dev);
struct azx *chip = card->private_data;
struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);
int rc;
rc = hda_tegra_enable_clocks(hda);
if (rc != 0)
return rc;
if (chip && chip->running) {
hda_tegra_init(hda);
azx_init_chip(chip, 1);
}
return 0;
}
#endif /* CONFIG_PM */