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ALSA: hda/tegra: runtime power management support

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This patch enables runtime power management(runtime PM) support for
hda. pm_runtime_enable() and pm_runtime_disable() are added during
device probe and remove respectively. The runtime PM callbacks will
be forbidden if hda controller does not have support for runtime PM.
pm_runtime_get_sync() and pm_runtime_put() are added for hda register
access. The callbacks for above will be added in subsequent patches.

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 13:03:16 +05:30 committed by Takashi Iwai
parent fd1cc9de64
commit 3f7e94e6d6
1 changed files with 14 additions and 1 deletions
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15
sound/pci/hda/hda_tegra.c
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@ -32,6 +32,7 @@
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/time.h> #include <linux/time.h>
#include <linux/string.h> #include <linux/string.h>
#include <linux/pm_runtime.h>
#include <sound/core.h> #include <sound/core.h>
#include <sound/initval.h> #include <sound/initval.h>
@ -512,6 +513,11 @@ static int hda_tegra_probe(struct platform_device *pdev)
card->private_data = chip; card->private_data = chip;
dev_set_drvdata(&pdev->dev, card); dev_set_drvdata(&pdev->dev, card);
pm_runtime_enable(hda->dev);
if (!azx_has_pm_runtime(chip))
pm_runtime_forbid(hda->dev);
schedule_work(&hda->probe_work); schedule_work(&hda->probe_work);
return 0; return 0;
@ -528,6 +534,7 @@ static void hda_tegra_probe_work(struct work_struct *work)
struct platform_device *pdev = to_platform_device(hda->dev); struct platform_device *pdev = to_platform_device(hda->dev);
int err; int err;
pm_runtime_get_sync(hda->dev);
err = hda_tegra_first_init(chip, pdev); err = hda_tegra_first_init(chip, pdev);
if (err < 0) if (err < 0)
goto out_free; goto out_free;
@ -549,12 +556,18 @@ static void hda_tegra_probe_work(struct work_struct *work)
snd_hda_set_power_save(&chip->bus, power_save * 1000); snd_hda_set_power_save(&chip->bus, power_save * 1000);
out_free: out_free:
pm_runtime_put(hda->dev);
return; /* no error return from async probe */ return; /* no error return from async probe */
} }
static int hda_tegra_remove(struct platform_device *pdev) static int hda_tegra_remove(struct platform_device *pdev)
{ {
return snd_card_free(dev_get_drvdata(&pdev->dev)); int ret;
ret = snd_card_free(dev_get_drvdata(&pdev->dev));
pm_runtime_disable(&pdev->dev);
return ret;
} }
static void hda_tegra_shutdown(struct platform_device *pdev) static void hda_tegra_shutdown(struct platform_device *pdev)