Hi,
On Fri, Jun 29 2012, Seungwon Jeon wrote:
> This patch adds packed command feature of eMMC4.5.
> The maximum number for packing read(or write) is offered
> and exception event relevant to packed command which is
> used for error handling is enabled. If host wants to use
> this feature, MMC_CAP2_PACKED_CMD should be set.
>
> Signed-off-by: Seungwon Jeon <tgih.jun@xxxxxxxxxxx>
> Reviewed-by: Maya Erez <merez@xxxxxxxxxxxxxx>
> Reviewed-by: Subhash Jadavani <subhashj@xxxxxxxxxxxxxx>
> Reviewed-by: Namjae Jeon <linkinjeon@xxxxxxxxx>
> ---
> drivers/mmc/core/mmc.c | 25 +++++++++++++++++++++++++
> include/linux/mmc/card.h | 3 +++
> include/linux/mmc/host.h | 4 ++++
> include/linux/mmc/mmc.h | 15 +++++++++++++++
> 4 files changed, 47 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 258b203..bfb271f 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -516,6 +516,11 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
> } else {
> card->ext_csd.data_tag_unit_size = 0;
> }
> +
> + card->ext_csd.max_packed_writes =
> + ext_csd[EXT_CSD_MAX_PACKED_WRITES];
> + card->ext_csd.max_packed_reads =
> + ext_csd[EXT_CSD_MAX_PACKED_READS];
> } else {
> card->ext_csd.data_sector_size = 512;
> }
> @@ -1246,6 +1251,26 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> }
> }
>
> + if ((host->caps2 & MMC_CAP2_PACKED_WR &&
> + card->ext_csd.max_packed_writes > 0) ||
> + (host->caps2 & MMC_CAP2_PACKED_RD &&
> + card->ext_csd.max_packed_reads > 0)) {
> + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> + EXT_CSD_EXP_EVENTS_CTRL,
> + EXT_CSD_PACKED_EVENT_EN,
> + card->ext_csd.generic_cmd6_time);
Sorry, I don't have a copy of the eMMC 4.5 spec -- is PACKED_EVENT_EN
a one-time programmable fuse on the eMMC, like BKOPS_ENABLE was?
Thanks,
- Chris.
--
Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/>
One Laptop Per Child
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