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mmc: sd: fix the maximum au_size for SD3.0

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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>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Jaehoon Chung 2013-07-18 13:34:41 +09:00 committed by Chris Ball
parent 7fca96758e
commit 77776fd0a4
1 changed files with 5 additions and 2 deletions
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7
drivers/mmc/core/sd.c
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@ -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 +239,15 @@ static int mmc_read_ssr(struct mmc_card *card)
for (i = 0; i < 16; i++)
ssr[i] = be32_to_cpu(ssr[i]);
/* SD3.0 increases max AU size to 64MB (0xF) from 4MB (0x9) */
max_au = card->scr.sda_spec3 ? 0xF : 0x9;
/*
* 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);