Hi Romain,
On Fri, Jun 14 2013, Romain Izard wrote:
> The field containing the production date in the CID register only uses
> 4 bits to encode the year, starting from 1997 in the original standard.
> In 2013, the production year field contains 0, and the kernel reports a
> 1997 production date.
>
> The eMMC 4.51 specification adds a new interpretation rule. For all
> devices implementing the 4.41 specification or later, the production
> year field will be interpreted as a value between 2010 and 2025, with
> 0 corresponding to 2013.
>
> Signed-off-by: Romain Izard <romain.izard.pro@xxxxxxxxx>
> ---
> drivers/mmc/core/mmc.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 3a69b94..3914523 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -482,6 +482,10 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
> }
>
> if (card->ext_csd.rev >= 5) {
> + /* Adjust production date as per JEDEC JESD84-B451 */
> + if (card->cid.year < 2010)
> + card->cid.year += 16;
> +
> /* check whether the eMMC card supports BKOPS */
> if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
> card->ext_csd.bkops = 1;
Thanks, pushed to mmc-next for 3.11.
- Chris.
--
Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/>
One Laptop Per Child
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