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Commit 52eb0ed3 authored by Ed Blake's avatar Ed Blake Committed by Mark Brown
Browse files

ASoC: img-spdif-in: Add suspend / resume handling 



Implement suspend and resume callbacks to save and restore register
state, to support platforms where the power is disabled during suspend.

In future the driver could be converted to use regmap which would
simplify the suspend and resume code.

Signed-off-by: default avatarEd Blake <ed.blake@sondrel.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent a38ced17

sound/soc/img/img-spdif-in.c

+38 −1
Original line number Diff line number Diff line
@@ -82,6 +82,8 @@ struct img_spdif_in { 
	unsigned int single_freq;

	unsigned int multi_freqs[IMG_SPDIF_IN_NUM_ACLKGEN];

	bool active;

	u32 suspend_clkgen;

	u32 suspend_ctl;



	/* Write-only registers */

	unsigned int aclkgen_regs[IMG_SPDIF_IN_NUM_ACLKGEN];
@@ -785,16 +787,51 @@ static int img_spdif_in_dev_remove(struct platform_device *pdev) 
	return 0;

}



#ifdef CONFIG_PM_SLEEP

static int img_spdif_in_suspend(struct device *dev)

{

	struct img_spdif_in *spdif = dev_get_drvdata(dev);



	spdif->suspend_clkgen = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CLKGEN);

	spdif->suspend_ctl = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CTL);



	clk_disable_unprepare(spdif->clk_sys);



	return 0;

}



static int img_spdif_in_resume(struct device *dev)

{

	struct img_spdif_in *spdif = dev_get_drvdata(dev);

	int i;



	clk_prepare_enable(spdif->clk_sys);



	for (i = 0; i < IMG_SPDIF_IN_NUM_ACLKGEN; i++)

		img_spdif_in_aclkgen_writel(spdif, i);



	img_spdif_in_writel(spdif, spdif->suspend_clkgen, IMG_SPDIF_IN_CLKGEN);

	img_spdif_in_writel(spdif, spdif->suspend_ctl, IMG_SPDIF_IN_CTL);



	return 0;

}

#endif



static const struct of_device_id img_spdif_in_of_match[] = {

	{ .compatible = "img,spdif-in" },

	{}

};

MODULE_DEVICE_TABLE(of, img_spdif_in_of_match);



static const struct dev_pm_ops img_spdif_in_pm_ops = {

	SET_SYSTEM_SLEEP_PM_OPS(img_spdif_in_suspend, img_spdif_in_resume)

};



static struct platform_driver img_spdif_in_driver = {

	.driver = {

		.name = "img-spdif-in",

		.of_match_table = img_spdif_in_of_match

		.of_match_table = img_spdif_in_of_match,

		.pm = &img_spdif_in_pm_ops

	},

	.probe = img_spdif_in_probe,

	.remove = img_spdif_in_dev_remove