Hi Girish,
On Fri, Sep 16 2011, Girish K S wrote:
> This patch adds the support of the HS200 bus speed for
> eMMC 4.5 devices.
> The eMMC 4.5 devices have support for 200MHz bus speed.
> The mmc core and host modules have been touched to add support
> for this module.
> It is necessary to know the card type in the sdhci.c file to
> add support for eMMC tuning function. So card.h file is included
> to import the card data structure.
>
> Signed-off-by: Girish K S <girish.shivananja...@linaro.org>
> ---
> drivers/mmc/core/bus.c | 3 +-
> drivers/mmc/core/mmc.c | 116
> ++++++++++++++++++++++++++++++++++++++++++----
> drivers/mmc/host/sdhci.c | 18 ++++++-
> include/linux/mmc/card.h | 3 +
> include/linux/mmc/host.h | 8 +++
> include/linux/mmc/mmc.h | 9 +++-
> 6 files changed, 143 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
> index 393d817..a0aa7ab 100644
> --- a/drivers/mmc/core/bus.c
> +++ b/drivers/mmc/core/bus.c
> @@ -301,10 +301,11 @@ int mmc_add_card(struct mmc_card *card)
> mmc_card_ddr_mode(card) ? "DDR " : "",
> type);
> } else {
> - printk(KERN_INFO "%s: new %s%s%s card at address %04x\n",
> + printk(KERN_INFO "%s: new %s%s%s%s card at address %04x\n",
> mmc_hostname(card->host),
> mmc_sd_card_uhs(card) ? "ultra high speed " :
> (mmc_card_highspeed(card) ? "high speed " : ""),
> + (mmc_card_hs200(card) ? "HS200 " : ""),
> mmc_card_ddr_mode(card) ? "DDR " : "",
> type, card->rca);
> }
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 9cbc113..c50ca42 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -283,6 +283,66 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8
> *ext_csd)
> }
> card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
> switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
> + case EXT_CSD_CARD_TYPE_SDR_200 | EXT_CSD_CARD_TYPE_52 |
> + EXT_CSD_CARD_TYPE_26:
> + card->ext_csd.hs_max_dtr = 200000000;
> + card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_200;
> + break;
> + case EXT_CSD_CARD_TYPE_SDR_200 | EXT_CSD_CARD_TYPE_DDR_1_8V |
> + EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
> + card->ext_csd.hs_max_dtr = 200000000;
> + card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_200;
> + break;
Please try shortening this switch-case by avoiding duplicating sections
that repeat the same action, and having the case fall-through instead.
Thanks,
- Chris.
--
Chris Ball <c...@laptop.org> <http://printf.net/>
One Laptop Per Child
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