[PATCH 1/2] mmc: core: fix the decision of mmc card-type

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Current implementation decides the card type exclusively. Even though
eMMC device can support both HS200 and DDR mode, card type will be
set only for HS200. If the host doesn't support HS200 but has DDR
capability, then DDR mode can't be selected.

Signed-off-by: Seungwon Jeon <tgih.jun@xxxxxxxxxxx>
---
 drivers/mmc/core/mmc.c   |   85 +++++++++++++++++++--------------------------
 include/linux/mmc/card.h |    4 ++
 include/linux/mmc/mmc.h  |   60 --------------------------------
 3 files changed, 40 insertions(+), 109 deletions(-)

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 54df5ad..ebb9522 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -235,6 +235,40 @@ static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
 	return err;
 }
 
+static void mmc_select_card_type(struct mmc_card *card)
+{
+	struct mmc_host *host = card->host;
+	u8 card_type = card->ext_csd.raw_card_type & EXT_CSD_CARD_TYPE_MASK;
+	unsigned int caps = host->caps, caps2 = host->caps2;
+	unsigned int hs_max_dtr = 0;
+
+	if (card_type & EXT_CSD_CARD_TYPE_26)
+		hs_max_dtr = MMC_HIGH_26_MAX_DTR;
+
+	if (caps & MMC_CAP_MMC_HIGHSPEED &&
+			card_type & EXT_CSD_CARD_TYPE_52)
+		hs_max_dtr = MMC_HIGH_52_MAX_DTR;
+
+	if (caps & MMC_CAP_1_8V_DDR &&
+			card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
+		hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
+
+	if (caps & MMC_CAP_1_2V_DDR &&
+			card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
+		hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
+
+	if (caps2 & MMC_CAP2_HS200_1_8V_SDR &&
+			card_type & EXT_CSD_CARD_TYPE_SDR_1_8V)
+		hs_max_dtr = MMC_HS200_MAX_DTR;
+
+	if (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
+			card_type & EXT_CSD_CARD_TYPE_SDR_1_2V)
+		hs_max_dtr = MMC_HS200_MAX_DTR;
+
+	card->ext_csd.hs_max_dtr = hs_max_dtr;
+	card->ext_csd.card_type = card_type;
+}
+
 /*
  * Decode extended CSD.
  */
@@ -284,56 +318,9 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 		if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 			mmc_card_set_blockaddr(card);
 	}
+
 	card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
-	switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
-	case EXT_CSD_CARD_TYPE_SDR_ALL:
-	case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_1_8V:
-	case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_1_2V:
-	case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_52:
-		card->ext_csd.hs_max_dtr = 200000000;
-		card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_200;
-		break;
-	case EXT_CSD_CARD_TYPE_SDR_1_2V_ALL:
-	case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_1_8V:
-	case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_1_2V:
-	case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_52:
-		card->ext_csd.hs_max_dtr = 200000000;
-		card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_1_2V;
-		break;
-	case EXT_CSD_CARD_TYPE_SDR_1_8V_ALL:
-	case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_1_8V:
-	case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_1_2V:
-	case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_52:
-		card->ext_csd.hs_max_dtr = 200000000;
-		card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_1_8V;
-		break;
-	case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
-	     EXT_CSD_CARD_TYPE_26:
-		card->ext_csd.hs_max_dtr = 52000000;
-		card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
-		break;
-	case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
-	     EXT_CSD_CARD_TYPE_26:
-		card->ext_csd.hs_max_dtr = 52000000;
-		card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
-		break;
-	case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
-	     EXT_CSD_CARD_TYPE_26:
-		card->ext_csd.hs_max_dtr = 52000000;
-		card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
-		break;
-	case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
-		card->ext_csd.hs_max_dtr = 52000000;
-		break;
-	case EXT_CSD_CARD_TYPE_26:
-		card->ext_csd.hs_max_dtr = 26000000;
-		break;
-	default:
-		/* MMC v4 spec says this cannot happen */
-		pr_warning("%s: card is mmc v4 but doesn't "
-			"support any high-speed modes.\n",
-			mmc_hostname(card->host));
-	}
+	mmc_select_card_type(card);
 
 	card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
 	card->ext_csd.raw_erase_timeout_mult =
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 629b823..d76513b 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -58,6 +58,10 @@ struct mmc_ext_csd {
 	unsigned int		generic_cmd6_time;	/* Units: 10ms */
 	unsigned int            power_off_longtime;     /* Units: ms */
 	unsigned int		hs_max_dtr;
+#define MMC_HIGH_26_MAX_DTR	26000000
+#define MMC_HIGH_52_MAX_DTR	52000000
+#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 */
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index b822a2c..d425cab 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -354,66 +354,6 @@ struct _mmc_csd {
 #define EXT_CSD_CARD_TYPE_SDR_1_2V	(1<<5)	/* Card can run at 200MHz */
 						/* SDR mode @1.2V I/O */
 
-#define EXT_CSD_CARD_TYPE_SDR_200	(EXT_CSD_CARD_TYPE_SDR_1_8V | \
-					 EXT_CSD_CARD_TYPE_SDR_1_2V)
-
-#define EXT_CSD_CARD_TYPE_SDR_ALL	(EXT_CSD_CARD_TYPE_SDR_200 | \
-					 EXT_CSD_CARD_TYPE_52 | \
-					 EXT_CSD_CARD_TYPE_26)
-
-#define	EXT_CSD_CARD_TYPE_SDR_1_2V_ALL	(EXT_CSD_CARD_TYPE_SDR_1_2V | \
-					 EXT_CSD_CARD_TYPE_52 | \
-					 EXT_CSD_CARD_TYPE_26)
-
-#define	EXT_CSD_CARD_TYPE_SDR_1_8V_ALL	(EXT_CSD_CARD_TYPE_SDR_1_8V | \
-					 EXT_CSD_CARD_TYPE_52 | \
-					 EXT_CSD_CARD_TYPE_26)
-
-#define EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_1_8V	(EXT_CSD_CARD_TYPE_SDR_1_2V | \
-						 EXT_CSD_CARD_TYPE_DDR_1_8V | \
-						 EXT_CSD_CARD_TYPE_52 | \
-						 EXT_CSD_CARD_TYPE_26)
-
-#define EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_1_8V	(EXT_CSD_CARD_TYPE_SDR_1_8V | \
-						 EXT_CSD_CARD_TYPE_DDR_1_8V | \
-						 EXT_CSD_CARD_TYPE_52 | \
-						 EXT_CSD_CARD_TYPE_26)
-
-#define EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_1_2V	(EXT_CSD_CARD_TYPE_SDR_1_2V | \
-						 EXT_CSD_CARD_TYPE_DDR_1_2V | \
-						 EXT_CSD_CARD_TYPE_52 | \
-						 EXT_CSD_CARD_TYPE_26)
-
-#define EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_1_2V	(EXT_CSD_CARD_TYPE_SDR_1_8V | \
-						 EXT_CSD_CARD_TYPE_DDR_1_2V | \
-						 EXT_CSD_CARD_TYPE_52 | \
-						 EXT_CSD_CARD_TYPE_26)
-
-#define EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_52	(EXT_CSD_CARD_TYPE_SDR_1_2V | \
-						 EXT_CSD_CARD_TYPE_DDR_52 | \
-						 EXT_CSD_CARD_TYPE_52 | \
-						 EXT_CSD_CARD_TYPE_26)
-
-#define EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_52	(EXT_CSD_CARD_TYPE_SDR_1_8V | \
-						 EXT_CSD_CARD_TYPE_DDR_52 | \
-						 EXT_CSD_CARD_TYPE_52 | \
-						 EXT_CSD_CARD_TYPE_26)
-
-#define EXT_CSD_CARD_TYPE_SDR_ALL_DDR_1_8V	(EXT_CSD_CARD_TYPE_SDR_200 | \
-						 EXT_CSD_CARD_TYPE_DDR_1_8V | \
-						 EXT_CSD_CARD_TYPE_52 | \
-						 EXT_CSD_CARD_TYPE_26)
-
-#define EXT_CSD_CARD_TYPE_SDR_ALL_DDR_1_2V	(EXT_CSD_CARD_TYPE_SDR_200 | \
-						 EXT_CSD_CARD_TYPE_DDR_1_2V | \
-						 EXT_CSD_CARD_TYPE_52 | \
-						 EXT_CSD_CARD_TYPE_26)
-
-#define EXT_CSD_CARD_TYPE_SDR_ALL_DDR_52	(EXT_CSD_CARD_TYPE_SDR_200 | \
-						 EXT_CSD_CARD_TYPE_DDR_52 | \
-						 EXT_CSD_CARD_TYPE_52 | \
-						 EXT_CSD_CARD_TYPE_26)
-
 #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 */
 #define EXT_CSD_BUS_WIDTH_8	2	/* Card is in 8 bit mode */
-- 
1.7.0.4


--
To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux USB Devel]     [Linux Media]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux