mmc: sdhci: add eMMC hardware reset support

Add an SDHCI operation for hardware reset and connect it to the
host controller operation.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 0e02cc1..d66a7a1 100644 (file)
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1471,6 +1471,14 @@ static int sdhci_get_ro(struct mmc_host *mmc)
        return 0;
 }
 
+static void sdhci_hw_reset(struct mmc_host *mmc)
+{
+       struct sdhci_host *host = mmc_priv(mmc);
+
+       if (host->ops && host->ops->hw_reset)
+               host->ops->hw_reset(host);
+}
+
 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
 {
        struct sdhci_host *host;
@@ -1805,6 +1813,7 @@ static const struct mmc_host_ops sdhci_ops = {
        .request        = sdhci_request,
        .set_ios        = sdhci_set_ios,
        .get_ro         = sdhci_get_ro,
+       .hw_reset       = sdhci_hw_reset,
        .enable_sdio_irq = sdhci_enable_sdio_irq,
        .start_signal_voltage_switch    = sdhci_start_signal_voltage_switch,
        .execute_tuning                 = sdhci_execute_tuning,

diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 745c42f..7bd919c 100644 (file)
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -273,7 +273,7 @@ struct sdhci_ops {
        void    (*platform_reset_enter)(struct sdhci_host *host, u8 mask);
        void    (*platform_reset_exit)(struct sdhci_host *host, u8 mask);
        int     (*set_uhs_signaling)(struct sdhci_host *host, unsigned int uhs);
-
+       void    (*hw_reset)(struct sdhci_host *host);
 };
 
 #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS