3.16.40-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Daniel Glöckner <dg@xxxxxxxxx> commit 0ed50abb2d8fc81570b53af25621dad560cd49b3 upstream. 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> Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx> --- drivers/mmc/card/block.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -2170,7 +2170,8 @@ static struct mmc_blk_data *mmc_blk_allo 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;