mmc: sdhci-of-dwcmshc: add suspend/resume support

Add dwcmshc specific system-level suspend and resume support.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Link: https://lore.kernel.org/r/20200515141926.52e088fe@xhacker.debian
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
index a9ed0e0..64ac0db 100644 (file)
--- a/drivers/mmc/host/sdhci-of-dwcmshc.c
+++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
@@ -163,6 +163,48 @@ static int dwcmshc_remove(struct platform_device *pdev)
        return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int dwcmshc_suspend(struct device *dev)
+{
+       struct sdhci_host *host = dev_get_drvdata(dev);
+       struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+       struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
+       int ret;
+
+       ret = sdhci_suspend_host(host);
+       if (ret)
+               return ret;
+
+       clk_disable_unprepare(pltfm_host->clk);
+       if (!IS_ERR(priv->bus_clk))
+               clk_disable_unprepare(priv->bus_clk);
+
+       return ret;
+}
+
+static int dwcmshc_resume(struct device *dev)
+{
+       struct sdhci_host *host = dev_get_drvdata(dev);
+       struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+       struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
+       int ret;
+
+       ret = clk_prepare_enable(pltfm_host->clk);
+       if (ret)
+               return ret;
+
+       if (!IS_ERR(priv->bus_clk)) {
+               ret = clk_prepare_enable(priv->bus_clk);
+               if (ret)
+                       return ret;
+       }
+
+       return sdhci_resume_host(host);
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(dwcmshc_pmops, dwcmshc_suspend, dwcmshc_resume);
+
 static const struct of_device_id sdhci_dwcmshc_dt_ids[] = {
        { .compatible = "snps,dwcmshc-sdhci" },
        {}
@@ -173,6 +215,7 @@ static struct platform_driver sdhci_dwcmshc_driver = {
        .driver = {
                .name   = "sdhci-dwcmshc",
                .of_match_table = sdhci_dwcmshc_dt_ids,
+               .pm = &dwcmshc_pmops,
        },
        .probe  = dwcmshc_probe,
        .remove = dwcmshc_remove,