From: Daniel Glöckner Date: Tue, 30 Aug 2016 12:17:30 +0000 (+0200) Subject: mmc: block: don't use CMD23 with very old MMC cards X-Git-Tag: firefly_0821_release~176^2~4^2~22^2~105 X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=bc7e4a29a556f753ed916cdd90f6f860d7d9a5cb;p=firefly-linux-kernel-4.4.55.git mmc: block: don't use CMD23 with very old MMC cards 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 Signed-off-by: Ulf Hansson Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index 64950035613b..f3a19b8ccfcb 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -2279,7 +2279,8 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card, 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;