[U-Boot] [PATCH v0] mmc: forced sector mode when accessing OCR register

[davide.bonfanti at bticino.it]

It seems to me a bug of the specific mmc like if that it declares byte-mode, but supports only sector mode.

Sincerely I don't know if it is a good idea to accept a workaround like this, but this is the only way I found to have my board working.

Best Regards,
Davide Bonfanti

-----Jae hoon Chung <jh80.chung at gmail.com> ha scritto: -----Per: Davide Bonfanti <davide.bonfanti at bticino.it>
Da: Jae hoon Chung <jh80.chung at gmail.com>
Data: 29/11/2012 16:10
Cc: u-boot at lists.denx.de, afleming at gmail.com, Jaehoon Chung <jh80.chung at samsung.com>
Oggetto: Re: [U-Boot] [PATCH v0] mmc: forced sector mode when accessing OCR register

Hi,

i didn't understand why need to set by force?

Best Regards,
Jaehoon Chung

2012/11/29 Davide Bonfanti <davide.bonfanti at bticino.it>:
> Some eMMC require this setting to work properly.
> Tested on:
>  - Toshiba THGBM2G8D8FBAIB (the one giving the problem)
>  - Toshiba THGBM4G4D1HBAR
>  - Micron MTFC4GMVEA
>  - Hynix H26M64002BNR
>  - SanDisk SDIN5E1-32G
>
>
> Signed-off-by: Davide Bonfanti <davide.bonfanti at bticino.it>
> ---
>  drivers/mmc/mmc.c |    3 ++-
>  include/mmc.h     |    1 +
>  2 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
> index 5ffd8c5..cf66811 100644
> --- a/drivers/mmc/mmc.c
> +++ b/drivers/mmc/mmc.c
> @@ -530,7 +530,8 @@ static int mmc_send_op_cond(struct mmc *mmc)
>    cmd.cmdarg = (mmc_host_is_spi(mmc) ? 0 :
>      (mmc->voltages &
>      (cmd.response[0] & OCR_VOLTAGE_MASK)) |
> -    (cmd.response[0] & OCR_ACCESS_MODE));
> +    (cmd.response[0] & OCR_ACCESS_MODE)) |
> +    OCR_ACCESS_SECTOR_MODE;
>
>    if (mmc->host_caps & MMC_MODE_HC)
>     cmd.cmdarg |= OCR_HCS;
> diff --git a/include/mmc.h b/include/mmc.h
> index a13e2bd..f1314d8 100644
> --- a/include/mmc.h
> +++ b/include/mmc.h
> @@ -108,6 +108,7 @@
>  #define OCR_HCS   0x40000000
>  #define OCR_VOLTAGE_MASK 0x007FFF80
>  #define OCR_ACCESS_MODE  0x60000000
> +#define OCR_ACCESS_SECTOR_MODE  (1 << 30)
>
>  #define SECURE_ERASE  0x80000000
>
> --
> 1.7.9.5
>
>
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