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mmc: sdhci-omap: Add Support for Suspend/Resume

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Add power management ops which save and restore the driver context and
facilitate a system suspend and resume.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Link: https://lore.kernel.org/r/20200305151228.24692-1-faiz_abbas@ti.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Faiz Abbas 2020-03-05 20:42:28 +05:30 • committed by Ulf Hansson
parent a5d90dc488
commit ee0f309263
1 changed files with 57 additions and 0 deletions
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57
drivers/mmc/host/sdhci-omap.c
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@ -108,6 +108,11 @@ struct sdhci_omap_host {
struct pinctrl *pinctrl; struct pinctrl *pinctrl;
struct pinctrl_state **pinctrl_state; struct pinctrl_state **pinctrl_state;
bool is_tuning; bool is_tuning;
/* Omap specific context save */
u32 con;
u32 hctl;
u32 sysctl;
u32 capa;
}; };
static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host); static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host);
@ -1235,12 +1240,64 @@ static int sdhci_omap_remove(struct platform_device *pdev)
return 0; return 0;
} }
#ifdef CONFIG_PM_SLEEP
static void sdhci_omap_context_save(struct sdhci_omap_host *omap_host)
{
omap_host->con = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
omap_host->hctl = sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL);
omap_host->capa = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
}
static void sdhci_omap_context_restore(struct sdhci_omap_host *omap_host)
{
sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, omap_host->con);
sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, omap_host->hctl);
sdhci_omap_writel(omap_host, SDHCI_OMAP_CAPA, omap_host->capa);
}
static int __maybe_unused sdhci_omap_suspend(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
sdhci_suspend_host(host);
sdhci_omap_context_save(omap_host);
pinctrl_pm_select_idle_state(dev);
pm_runtime_force_suspend(dev);
return 0;
}
static int __maybe_unused sdhci_omap_resume(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
pm_runtime_force_resume(dev);
pinctrl_pm_select_default_state(dev);
sdhci_omap_context_restore(omap_host);
sdhci_resume_host(host);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(sdhci_omap_dev_pm_ops, sdhci_omap_suspend,
sdhci_omap_resume);
static struct platform_driver sdhci_omap_driver = { static struct platform_driver sdhci_omap_driver = {
.probe = sdhci_omap_probe, .probe = sdhci_omap_probe,
.remove = sdhci_omap_remove, .remove = sdhci_omap_remove,
.driver = { .driver = {
.name = "sdhci-omap", .name = "sdhci-omap",
.pm = &sdhci_omap_dev_pm_ops,
.of_match_table = omap_sdhci_match, .of_match_table = omap_sdhci_match,
}, },
}; };