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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: Ed Blake <ed.blake@sondrel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Ed Blake 2017-10-06 15:53:54 +01:00 committed by Mark Brown
parent a38ced1732
commit 52eb0ed3ec
1 changed files with 38 additions and 1 deletions
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39
sound/soc/img/img-spdif-in.c
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@ -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