> -----Original Message-----
> From: [email protected] [mailto:linux-mmc-
> [email protected]] On Behalf Of Jaehoon Chung
> Sent: Tuesday, February 21, 2012 10:02 AM
> To: linux-mmc
> Cc: Chris Ball; Kyungmin Park; [email protected]
> Subject: [PATCH] mmc: core: fix wrong bit operation for SD card's au_size
>
> In SD spec, AU_SIZE and the value can be selected from 16KB.
> But this code should be selected from 32KB.
> I think right that shift (au + 3) instead of (au + 4).
>
> Signed-off-by: Jaehoon Chung <[email protected]>
> Signed-off-by: Kyungmin Park <[email protected]>
> CC: Hyeonsu Kim <[email protected]>
> ---
> drivers/mmc/core/sd.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index
> 5017f93..85c7b39 100644
> --- a/drivers/mmc/core/sd.c
> +++ b/drivers/mmc/core/sd.c
> @@ -245,7 +245,7 @@ static int mmc_read_ssr(struct mmc_card *card)
> */
> au = UNSTUFF_BITS(ssr, 428 - 384, 4);
> if (au > 0 || au <= 9) {
> - card->ssr.au = 1 << (au + 4);
> + card->ssr.au = 1 << (au + 3);
(au+4) is correct only. Look at the definition of "card->ssr.au"
("include/linux/mmc/card.h"), au is in terms of sectors.
struct sd_ssr {
unsigned int au; /*
In sectors */
Now let's take the example of "AU_SIZE" = 1 then (1 << (au+4)) would be 32.
Now as "card->sss.au" is in term of sectors, 32 sectors means 16KB (assuming
512 byte sector size).
Regards,
Subhash
> es = UNSTUFF_BITS(ssr, 408 - 384, 16);
> et = UNSTUFF_BITS(ssr, 402 - 384, 6);
> eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
> --
> 1.7.4.1
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