mmc: Add generic tuning flag

Set generic mmc->tuning flag when performing tuning to indicate
this condition to drivers. Drivers may use this to bypass various
checks during tuning.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c
index 3284568..304bd5e 100644
--- a/drivers/mmc/mmc-uclass.c
+++ b/drivers/mmc/mmc-uclass.c
@@ -124,7 +124,13 @@
 
 int mmc_execute_tuning(struct mmc *mmc, uint opcode)
 {
-	return dm_mmc_execute_tuning(mmc->dev, opcode);
+	int ret;
+
+	mmc->tuning = true;
+	ret = dm_mmc_execute_tuning(mmc->dev, opcode);
+	mmc->tuning = false;
+
+	return ret;
 }
 #endif
 
diff --git a/include/mmc.h b/include/mmc.h
index a4584f8..4b8327f 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -736,6 +736,7 @@
 				  * accessing the boot partitions
 				  */
 	u32 quirks;
+	bool tuning:1;
 	bool hs400_tuning:1;
 
 	enum bus_mode user_speed_mode; /* input speed mode from user */