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>

diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
index edd4d91..6012926 100644 (file)
--- a/drivers/mmc/host/sdhci-xenon.c
+++ b/drivers/mmc/host/sdhci-xenon.c
@@ -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,