+ stable
On 30 August 2016 at 14:17, Daniel Glöckner <dg@xxxxxxxxx> wrote:
> CMD23 aka SET_BLOCK_COUNT was introduced with MMC v3.1.
> Older versions of the specification allowed to terminate
> multi-block transfers only with CMD12.
>
> The patch fixes the following problem:
>
> mmc0: new MMC card at address 0001
> mmcblk0: mmc0:0001 SDMB-16 15.3 MiB
> mmcblk0: timed out sending SET_BLOCK_COUNT command, card status 0x400900
> ...
> blk_update_request: I/O error, dev mmcblk0, sector 0
> Buffer I/O error on dev mmcblk0, logical block 0, async page read
> mmcblk0: unable to read partition table
>
> Signed-off-by: Daniel Glöckner <dg@xxxxxxxxx>
This was an old problem you found, nice! I should remove the dust from
my old MMC cards and give them a go with this change.
I assume it could be worth to send this to stable as well, so I will
add a stable tag to it.
Applied for next! Thanks and kind regards!
Uffe
> ---
> drivers/mmc/card/block.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
> index 2206d44..0fec40d 100644
> --- a/drivers/mmc/card/block.c
> +++ b/drivers/mmc/card/block.c
> @@ -2303,7 +2303,8 @@ again:
> set_capacity(md->disk, size);
>
> if (mmc_host_cmd23(card->host)) {
> - if (mmc_card_mmc(card) ||
> + if ((mmc_card_mmc(card) &&
> + card->csd.mmca_vsn >= CSD_SPEC_VER_3)||
> (mmc_card_sd(card) &&
> card->scr.cmds & SD_SCR_CMD23_SUPPORT))
> md->flags |= MMC_BLK_CMD23;
> --
> 2.1.2
>
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