[PATCH] mmc: sd: fix the maximum au_size for SD3.0

[Jaehoon Chung <jh80.chung@samsung.com>]

Since SD Physical Layer specification V3.0, AU_SIZE is supported up to 0xf.
So If SD-card is supported v3.0, then max_au should be 0xf.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 drivers/mmc/core/sd.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 176d125..aa5013f 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -215,7 +215,7 @@ static int mmc_decode_scr(struct mmc_card *card)
 static int mmc_read_ssr(struct mmc_card *card)
 {
 	unsigned int au, es, et, eo;
-	int err, i;
+	int err, i, max_au;
 	u32 *ssr;
 
 	if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
@@ -239,12 +239,18 @@ static int mmc_read_ssr(struct mmc_card *card)
 	for (i = 0; i < 16; i++)
 		ssr[i] = be32_to_cpu(ssr[i]);
 
+	/* The value of maximum au_size is supported 0xF since SD3.0 */
+	if (card->scr.sda_spec3)
+		max_au = 0xf;
+	else
+		max_au = 9;
+
 	/*
 	 * UNSTUFF_BITS only works with four u32s so we have to offset the
 	 * bitfield positions accordingly.
 	 */
 	au = UNSTUFF_BITS(ssr, 428 - 384, 4);
-	if (au > 0 && au <= 9) {
+	if (au > 0 && au <= max_au) {
 		card->ssr.au = 1 << (au + 4);
 		es = UNSTUFF_BITS(ssr, 408 - 384, 16);
 		et = UNSTUFF_BITS(ssr, 402 - 384, 6);
-- 
1.7.9.5