mmc: sdhci: execute tuning when device is not busy

We find tuning timeout because of the secure erase operation lasts too
long, so don't do tuning when device is busy.
Signed-off-by: Yi Sun <yi.y.sun@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci.c

@@ -1366,11 +1366,12 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 		present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
 		/*
 		 * Check if the re-tuning timer has already expired and there
-		 * is no on-going data transfer. If so, we need to execute
-		 * tuning procedure before sending command.
+		 * is no on-going data transfer and DAT0 is not busy. If so,
+		 * we need to execute tuning procedure before sending command.
 		 */
 		if ((host->flags & SDHCI_NEEDS_RETUNING) &&
-		    !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ))) {
+		    !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ)) &&
+		    (present_state & SDHCI_DATA_0_LVL_MASK)) {
 			if (mmc->card) {
 				/* eMMC uses cmd21 but sd and sdio use cmd19 */
 				tuning_opcode =

drivers/mmc/host/sdhci.h

@@ -72,6 +72,7 @@
 #define  SDHCI_WRITE_PROTECT	0x00080000
 #define  SDHCI_DATA_LVL_MASK	0x00F00000
 #define   SDHCI_DATA_LVL_SHIFT	20
+#define   SDHCI_DATA_0_LVL_MASK	0x00100000
 
 #define SDHCI_HOST_CONTROL	0x28
 #define  SDHCI_CTRL_LED		0x01