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

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>

diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c
index c497817..1ec74c2 100644 (file)
--- a/drivers/mmc/host/sdhci-omap.c
+++ b/drivers/mmc/host/sdhci-omap.c
@@ -108,6 +108,11 @@ struct sdhci_omap_host {
        struct pinctrl          *pinctrl;
        struct pinctrl_state    **pinctrl_state;
        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);
@@ -1235,12 +1240,64 @@ static int sdhci_omap_remove(struct platform_device *pdev)
 
        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 = {
        .probe = sdhci_omap_probe,
        .remove = sdhci_omap_remove,
        .driver = {
                   .name = "sdhci-omap",
+                  .pm = &sdhci_omap_dev_pm_ops,
                   .of_match_table = omap_sdhci_match,
                  },
 };