mmc: identify available device type to select

Device types which are supported by both host and device can be
identified when EXT_CSD is read. There is no need to check host's
capability anymore.
Signed-off-by: NSeungwon Jeon <tgih.jun@samsung.com>
Tested-by: NJaehoon Chung <jh80.chung@samsung.com>
Acked-by: NJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: NChris Ball <chris@printf.net>

drivers/mmc/core/mmc.c

@@ -243,28 +243,46 @@ static void mmc_select_card_type(struct mmc_card *card)
 	u8 card_type = card->ext_csd.raw_card_type & EXT_CSD_CARD_TYPE_MASK;
 	u32 caps = host->caps, caps2 = host->caps2;
 	unsigned int hs_max_dtr = 0;
+	unsigned int avail_type = 0;
 
-	if (card_type & EXT_CSD_CARD_TYPE_26)
+	if (caps & MMC_CAP_MMC_HIGHSPEED &&
+	    card_type & EXT_CSD_CARD_TYPE_HS_26) {
 		hs_max_dtr = MMC_HIGH_26_MAX_DTR;
+		avail_type |= EXT_CSD_CARD_TYPE_HS_26;
+	}
 
 	if (caps & MMC_CAP_MMC_HIGHSPEED &&
-			card_type & EXT_CSD_CARD_TYPE_52)
+	    card_type & EXT_CSD_CARD_TYPE_HS_52) {
 		hs_max_dtr = MMC_HIGH_52_MAX_DTR;
+		avail_type |= EXT_CSD_CARD_TYPE_HS_52;
+	}
 
-	if ((caps & MMC_CAP_1_8V_DDR &&
-			card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) ||
-	    (caps & MMC_CAP_1_2V_DDR &&
-			card_type & EXT_CSD_CARD_TYPE_DDR_1_2V))
+	if (caps & MMC_CAP_1_8V_DDR &&
+	    card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) {
 		hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
+		avail_type |= EXT_CSD_CARD_TYPE_DDR_1_8V;
+	}
+
+	if (caps & MMC_CAP_1_2V_DDR &&
+	    card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
+		hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
+		avail_type |= EXT_CSD_CARD_TYPE_DDR_1_2V;
+	}
 
-	if ((caps2 & MMC_CAP2_HS200_1_8V_SDR &&
-			card_type & EXT_CSD_CARD_TYPE_SDR_1_8V) ||
-	    (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
-			card_type & EXT_CSD_CARD_TYPE_SDR_1_2V))
+	if (caps2 & MMC_CAP2_HS200_1_8V_SDR &&
+	    card_type & EXT_CSD_CARD_TYPE_HS200_1_8V) {
 		hs_max_dtr = MMC_HS200_MAX_DTR;
+		avail_type |= EXT_CSD_CARD_TYPE_HS200_1_8V;
+	}
+
+	if (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
+	    card_type & EXT_CSD_CARD_TYPE_HS200_1_2V) {
+		hs_max_dtr = MMC_HS200_MAX_DTR;
+		avail_type |= EXT_CSD_CARD_TYPE_HS200_1_2V;
+	}
 
 	card->ext_csd.hs_max_dtr = hs_max_dtr;
-	card->ext_csd.card_type = card_type;
+	card->mmc_avail_type = avail_type;
 }
 
 /*
@@ -800,12 +818,10 @@ static int mmc_select_hs200(struct mmc_card *card)
 
 	host = card->host;
 
-	if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V &&
-			host->caps2 & MMC_CAP2_HS200_1_2V_SDR)
+	if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
 		err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
 
-	if (err && card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_8V &&
-			host->caps2 & MMC_CAP2_HS200_1_8V_SDR)
+	if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
 		err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
 
 	/* If fails try again during next card power cycle */
@@ -1064,10 +1080,9 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 	 */
 	if (card->ext_csd.hs_max_dtr != 0) {
 		err = 0;
-		if (card->ext_csd.hs_max_dtr > 52000000 &&
-		    host->caps2 & MMC_CAP2_HS200)
+		if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
 			err = mmc_select_hs200(card);
-		else if	(host->caps & MMC_CAP_MMC_HIGHSPEED)
+		else if	(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
 			err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 					EXT_CSD_HS_TIMING, 1,
 					card->ext_csd.generic_cmd6_time,
@@ -1081,13 +1096,11 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 			       mmc_hostname(card->host));
 			err = 0;
 		} else {
-			if (card->ext_csd.hs_max_dtr > 52000000 &&
-			    host->caps2 & MMC_CAP2_HS200) {
+			if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
 				mmc_set_timing(card->host,
 					       MMC_TIMING_MMC_HS200);
-			} else {
+			else
 				mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
-			}
 		}
 	}
 
@@ -1110,14 +1123,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 	/*
 	 * Indicate DDR mode (if supported).
 	 */
-	if (mmc_card_hs(card)) {
-		if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
-			&& (host->caps & MMC_CAP_1_8V_DDR))
-				ddr = MMC_1_8V_DDR_MODE;
-		else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
-			&& (host->caps & MMC_CAP_1_2V_DDR))
-				ddr = MMC_1_2V_DDR_MODE;
-	}
+	if (mmc_card_hs(card))
+		ddr = card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52;
 
 	/*
 	 * Indicate HS200 SDR mode (if supported).
@@ -1137,8 +1144,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 		 * 3. set the clock to > 52Mhz <=200MHz and
 		 * 4. execute tuning for HS200
 		 */
-		if ((host->caps2 & MMC_CAP2_HS200) &&
-		    card->host->ops->execute_tuning) {
+		if (card->host->ops->execute_tuning) {
 			mmc_host_clk_hold(card->host);
 			err = card->host->ops->execute_tuning(card->host,
 				MMC_SEND_TUNING_BLOCK_HS200);
@@ -1247,7 +1253,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 			 *
 			 * WARNING: eMMC rules are NOT the same as SD DDR
 			 */
-			if (ddr == MMC_1_2V_DDR_MODE) {
+			if (ddr & EXT_CSD_CARD_TYPE_DDR_1_2V) {
 				err = __mmc_set_signal_voltage(host,
 					MMC_SIGNAL_VOLTAGE_120);
 				if (err)

include/linux/mmc/card.h

@@ -68,7 +68,6 @@ struct mmc_ext_csd {
 #define MMC_HIGH_DDR_MAX_DTR	52000000
 #define MMC_HS200_MAX_DTR	200000000
 	unsigned int		sectors;
-	unsigned int		card_type;
 	unsigned int		hc_erase_size;		/* In sectors */
 	unsigned int		hc_erase_timeout;	/* In milliseconds */
 	unsigned int		sec_trim_mult;	/* Secure trim multiplier  */
@@ -298,6 +297,7 @@ struct mmc_card {
 	struct sdio_func_tuple	*tuples;	/* unknown common tuples */
 
 	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 */
 
 	struct dentry		*debugfs_root;
 	struct mmc_part	part[MMC_NUM_PHY_PARTITION]; /* physical partitions */

include/linux/mmc/host.h

@@ -62,12 +62,6 @@ struct mmc_ios {
 #define MMC_TIMING_MMC_DDR52	8
 #define MMC_TIMING_MMC_HS200	9
 
-#define MMC_SDR_MODE		0
-#define MMC_1_2V_DDR_MODE	1
-#define MMC_1_8V_DDR_MODE	2
-#define MMC_1_2V_SDR_MODE	3
-#define MMC_1_8V_SDR_MODE	4
-
 	unsigned char	signal_voltage;		/* signalling voltage (1.8V or 3.3V) */
 
 #define MMC_SIGNAL_VOLTAGE_330	0

include/linux/mmc/mmc.h

@@ -354,18 +354,22 @@ struct _mmc_csd {
 #define EXT_CSD_CMD_SET_SECURE		(1<<1)
 #define EXT_CSD_CMD_SET_CPSECURE	(1<<2)
 
-#define EXT_CSD_CARD_TYPE_26	(1<<0)	/* Card can run at 26MHz */
-#define EXT_CSD_CARD_TYPE_52	(1<<1)	/* Card can run at 52MHz */
 #define EXT_CSD_CARD_TYPE_MASK	0x3F	/* Mask out reserved bits */
+#define EXT_CSD_CARD_TYPE_HS_26	(1<<0)	/* Card can run at 26MHz */
+#define EXT_CSD_CARD_TYPE_HS_52	(1<<1)	/* Card can run at 52MHz */
+#define EXT_CSD_CARD_TYPE_HS	(EXT_CSD_CARD_TYPE_HS_26 | \
+				 EXT_CSD_CARD_TYPE_HS_52)
 #define EXT_CSD_CARD_TYPE_DDR_1_8V  (1<<2)   /* Card can run at 52MHz */
 					     /* DDR mode @1.8V or 3V I/O */
 #define EXT_CSD_CARD_TYPE_DDR_1_2V  (1<<3)   /* Card can run at 52MHz */
 					     /* DDR mode @1.2V I/O */
 #define EXT_CSD_CARD_TYPE_DDR_52       (EXT_CSD_CARD_TYPE_DDR_1_8V  \
 					| EXT_CSD_CARD_TYPE_DDR_1_2V)
-#define EXT_CSD_CARD_TYPE_SDR_1_8V	(1<<4)	/* Card can run at 200MHz */
-#define EXT_CSD_CARD_TYPE_SDR_1_2V	(1<<5)	/* Card can run at 200MHz */
+#define EXT_CSD_CARD_TYPE_HS200_1_8V	(1<<4)	/* Card can run at 200MHz */
+#define EXT_CSD_CARD_TYPE_HS200_1_2V	(1<<5)	/* Card can run at 200MHz */
 						/* SDR mode @1.2V I/O */
+#define EXT_CSD_CARD_TYPE_HS200		(EXT_CSD_CARD_TYPE_HS200_1_8V | \
+					 EXT_CSD_CARD_TYPE_HS200_1_2V)
 
 #define EXT_CSD_BUS_WIDTH_1	0	/* Card is in 1 bit mode */
 #define EXT_CSD_BUS_WIDTH_4	1	/* Card is in 4 bit mode */