ENGR00278646-1 mmc: sdhci: add hooks for platform specific tuning

The tuning of some platforms may not follow the standard host control
spec v3.0, e.g. Freescale uSDHC on i.MX6Q/DL.
Add a hook here to allow execute platform specific tuning instead of
standard host controller tuning.

Signed-off-by: Dong Aisheng <b29396@freescale.com>

2 files changed, 9 insertions, 0 deletions

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index ce8db607a85b..adc73b5e97de 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1859,6 +1859,14 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
                 return 0;
         }
 
+        if (host->ops->platform_execute_tuning) {
+                spin_unlock(&host->lock);
+                enable_irq(host->irq);
+                err = host->ops->platform_execute_tuning(host, opcode);
+                sdhci_runtime_pm_put(host);
+                return err;
+        }
+
         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
 
         /*
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 379e09d9f3c1..851c2fba3eb1 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -288,6 +288,7 @@ struct sdhci_ops {
         unsigned int    (*get_ro)(struct sdhci_host *host);
         void    (*platform_reset_enter)(struct sdhci_host *host, u8 mask);
         void    (*platform_reset_exit)(struct sdhci_host *host, u8 mask);
+        int     (*platform_execute_tuning)(struct sdhci_host *host, u32 opcode);
         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);