mmc: sdhci: Add platform suspend/resume hooks.

Some platforms require saving/restoring registers across suspend/resume;
this hook allows them to do that inside their driver.

Signed-off-by: Chris Ball <cjb@laptop.org>

2 files changed, 8 insertions, 0 deletions

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 8d66706824a6..1f5888b42b2c 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2379,6 +2379,9 @@ int sdhci_suspend_host(struct sdhci_host *host)
         int ret;
         bool has_tuning_timer;
 
+        if (host->ops->platform_suspend)
+                host->ops->platform_suspend(host);
+
         sdhci_disable_card_detection(host);
 
         /* Disable tuning since we are suspending */
@@ -2429,6 +2432,9 @@ int sdhci_resume_host(struct sdhci_host *host)
         ret = mmc_resume_host(host->mmc);
         sdhci_enable_card_detection(host);
 
+        if (host->ops->platform_resume)
+                host->ops->platform_resume(host);
+
         /* Set the re-tuning expiration flag */
         if ((host->version >= SDHCI_SPEC_300) && host->tuning_count &&
             (host->tuning_mode == SDHCI_TUNING_MODE_1))
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index ad265b96b75b..f761f23d2a28 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -275,6 +275,8 @@ struct sdhci_ops {
         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);
+        void    (*platform_suspend)(struct sdhci_host *host);
+        void    (*platform_resume)(struct sdhci_host *host);
 };
 
 #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS