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[[v4] 4/5] MMC: Block CMD23 support for UHS104/SDXC cards.

Message ID 1303870235-29041-5-git-send-email-andreiw@motorola.com (mailing list archive)
State New, archived
Headers show

Commit Message

Andrei Warkentin April 27, 2011, 2:10 a.m. UTC 
SD cards operating at UHS104 or better support SET_BLOCK_COUNT.

Cc: arindam.nath@amd.com
Cc: cjb@laptop.org
Cc: arnd@arndb.de
Signed-off-by: Andrei Warkentin <andreiw@motorola.com>
---
 drivers/mmc/card/block.c |    9 ++++++---
 drivers/mmc/core/sd.c    |    7 +++++++
 include/linux/mmc/card.h |    4 ++++
 include/linux/mmc/sd.h   |    2 +-
 4 files changed, 18 insertions(+), 4 deletions(-)
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Patch

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index b91bec2..96250cf 100755
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -863,9 +863,12 @@  static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
 	blk_queue_logical_block_size(md->queue.queue, 512);
 	set_capacity(md->disk, size);
 
-	if (mmc_host_cmd23(card->host) &&
-	    mmc_card_mmc(card))
-		md->flags |= MMC_BLK_CMD23;
+	if (mmc_host_cmd23(card->host)) {
+		if (mmc_card_mmc(card) ||
+		    (mmc_card_sd(card) &&
+		     card->scr.cmds & SD_SCR_CMD23_SUPPORT))
+			md->flags |= MMC_BLK_CMD23;
+	}
 
 	if (mmc_card_mmc(card) &&
 	    md->flags & MMC_BLK_CMD23 &&
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 6dac89f..a3d771a 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -195,6 +195,13 @@  static int mmc_decode_scr(struct mmc_card *card)
 	else
 		card->erased_byte = 0x0;
 
+	if (scr->sda_vsn == SCR_SPEC_VER_2) {
+
+		/* Check if Physical Layer Spec v3.0X is supported. */
+		scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
+		if (scr->sda_spec3)
+			scr->cmds = UNSTUFF_BITS(resp, 32, 2);
+	}
 	return 0;
 }
 
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index c758181..e6b2e6f 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -67,9 +67,13 @@  struct mmc_ext_csd {
 
 struct sd_scr {
 	unsigned char		sda_vsn;
+	unsigned char		sda_spec3;
 	unsigned char		bus_widths;
 #define SD_SCR_BUS_WIDTH_1	(1<<0)
 #define SD_SCR_BUS_WIDTH_4	(1<<2)
+	unsigned char		cmds;
+#define SD_SCR_CMD20_SUPPORT   (1<<0)
+#define SD_SCR_CMD23_SUPPORT   (1<<1)
 };
 
 struct sd_ssr {
diff --git a/include/linux/mmc/sd.h b/include/linux/mmc/sd.h
index 3fd85e0..9fe0689 100644
--- a/include/linux/mmc/sd.h
+++ b/include/linux/mmc/sd.h
@@ -59,7 +59,7 @@ 
 
 #define SCR_SPEC_VER_0		0	/* Implements system specification 1.0 - 1.01 */
 #define SCR_SPEC_VER_1		1	/* Implements system specification 1.10 */
-#define SCR_SPEC_VER_2		2	/* Implements system specification 2.00 */
+#define SCR_SPEC_VER_2		2	/* Implements system specification 2.00-3.0X */
 
 /*
  * SD bus widths