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Commit 3f7e94e6 authored by Sameer Pujar's avatar Sameer Pujar Committed by Takashi Iwai
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ALSA: hda/tegra: runtime power management support 



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: default avatarSameer Pujar <spujar@nvidia.com>
Reviewed-by: default avatarRavindra Lokhande <rlokhande@nvidia.com>
Reviewed-by: default avatarMohan Kumar D <mkumard@nvidia.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent fd1cc9de

sound/pci/hda/hda_tegra.c

+14 −1
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ 
#include <linux/slab.h>

#include <linux/time.h>

#include <linux/string.h>

#include <linux/pm_runtime.h>



#include <sound/core.h>

#include <sound/initval.h>
@@ -512,6 +513,11 @@ static int hda_tegra_probe(struct platform_device *pdev) 
	card->private_data = chip;



	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);



	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);

	int err;



	pm_runtime_get_sync(hda->dev);

	err = hda_tegra_first_init(chip, pdev);

	if (err < 0)

		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);



 out_free:

	pm_runtime_put(hda->dev);

	return; /* no error return from async probe */

}



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)