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@xxxxxxxxxx>
Reviewed-by: Ravindra Lokhande <rlokhande@xxxxxxxxxx>
Reviewed-by: Mohan Kumar D <mkumard@xxxxxxxxxx>
---
sound/pci/hda/hda_tegra.c | 49 +++++++++++++++++++++++++++++++----------------
1 file changed, 33 insertions(+), 16 deletions(-)
diff --git a/sound/pci/hda/hda_tegra.c b/sound/pci/hda/hda_tegra.c
index f068b1e..a7fd4c6 100644
--- a/sound/pci/hda/hda_tegra.c
+++ b/sound/pci/hda/hda_tegra.c
@@ -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 */
--
2.7.4
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