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mmc: sdhci-xenon: Add Xenon SDHCI specific system-level PM support 

Add Xenon specific system-level suspend and resume support.
Especially during resume, re-configure Xenon specific registers
since registers setting will be lost in suspend if Xenon is power off.

Signed-off-by: Hu Ziji <huziji@marvell.com>
Signed-off-by: Zhoujie Wu <zjwu@marvell.com>
Tested-by: Jisheng Zhang <jszhang@marvell.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Hu Ziji 2017-07-12 15:16:19 -07:00 committed by Ulf Hansson
parent 03de19212e
commit a0fd95b30e
1 changed files with 41 additions and 1 deletions
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42
drivers/mmc/host/sdhci-xenon.c
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@ -518,6 +518,46 @@ static int xenon_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int xenon_suspend(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
int ret;
ret = sdhci_suspend_host(host);
if (ret)
return ret;
clk_disable_unprepare(pltfm_host->clk);
return ret;
}
static int xenon_resume(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
int ret;
ret = clk_prepare_enable(pltfm_host->clk);
if (ret)
return ret;
/*
* If SoCs power off the entire Xenon, registers setting will
* be lost.
* Re-configure Xenon specific register to enable current SDHC
*/
ret = xenon_sdhc_prepare(host);
if (ret)
return ret;
return sdhci_resume_host(host);
}
#endif
static SIMPLE_DEV_PM_OPS(xenon_pmops, xenon_suspend, xenon_resume);
static const struct of_device_id sdhci_xenon_dt_ids[] = {
{ .compatible = "marvell,armada-ap806-sdhci",},
{ .compatible = "marvell,armada-cp110-sdhci",},
@ -530,7 +570,7 @@ static struct platform_driver sdhci_xenon_driver = {
.driver = {
.name = "xenon-sdhci",
.of_match_table = sdhci_xenon_dt_ids,
.pm = &sdhci_pltfm_pmops,
.pm = &xenon_pmops,
},
.probe = xenon_probe,
.remove = xenon_remove,