Hi Al,
On Fri, Nov 30 2012, Al Cooper wrote:
> If "caps2" host capabilities does not indicate support for MMC
> HS200, don't allow clock speeds >52MHz. Currently, for MMC, the
> clock speed is set to the lesser of the max speed the eMMC module
> supports (card->ext_csd.hs_max_dtr) or the max base clock of the
> host controller (host->f_max based on BASE_CLK_FREQ in the host
> CAPS register). This means that a host controller that doesn't
> support HS200 mode but has a base clock of 100MHz and an eMMC module
> that supports HS200 speeds will end up using a 100MHz clock.
>
> Signed-off-by: Al Cooper <alcooperx@xxxxxxxxx>
> ---
> drivers/mmc/core/mmc.c | 2 ++
> 1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 7cc4638..6d669c3 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -1051,6 +1051,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> if (mmc_card_highspeed(card) || mmc_card_hs200(card)) {
> if (max_dtr > card->ext_csd.hs_max_dtr)
> max_dtr = card->ext_csd.hs_max_dtr;
> + if (mmc_card_highspeed(card) && (max_dtr > 52000000))
> + max_dtr = 52000000;
> } else if (max_dtr > card->csd.max_dtr) {
> max_dtr = card->csd.max_dtr;
> }
Thanks, pushed to mmc-next for 3.8.
- Chris.
--
Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/>
One Laptop Per Child
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