mmc: core: Record card drive strength

In preparation for adding drive strength support
for eMMC, add drive_strength to struct mmc_card
to record the card drive strength for UHS-I modes
and HS200 / HS400. For eMMC this will be needed
when switching between HS200 and HS400.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/core/sd.c

@@ -389,6 +389,8 @@ static int sd_select_driver_type(struct mmc_card *card, u8 *status)
 	int card_drv_type, drive_strength, drv_type;
 	int err;
 
+	card->drive_strength = 0;
+
 	card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
 
 	drive_strength = mmc_select_drive_strength(card,
@@ -404,6 +406,7 @@ static int sd_select_driver_type(struct mmc_card *card, u8 *status)
 				mmc_hostname(card->host));
 			return 0;
 		}
+		card->drive_strength = drive_strength;
 	}
 
 	if (drv_type)

drivers/mmc/core/sdio.c

@@ -406,6 +406,8 @@ static void sdio_select_driver_type(struct mmc_card *card)
 	unsigned char card_strength;
 	int err;
 
+	card->drive_strength = 0;
+
 	card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
 
 	drive_strength = mmc_select_drive_strength(card,
@@ -427,6 +429,7 @@ static void sdio_select_driver_type(struct mmc_card *card)
 				       card_strength, NULL);
 		if (err)
 			return;
+		card->drive_strength = drive_strength;
 	}
 
 	if (drv_type)

include/linux/mmc/card.h

@@ -305,6 +305,7 @@ struct mmc_card {
 
 	unsigned int		sd_bus_speed;	/* Bus Speed Mode set for the card */
 	unsigned int		mmc_avail_type;	/* supported device type by both host and card */
+	unsigned int		drive_strength;	/* for UHS-I, HS200 or HS400 */
 
 	struct dentry		*debugfs_root;
 	struct mmc_part	part[MMC_NUM_PHY_PARTITION]; /* physical partitions */