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authorDaniel Glöckner <dg@emlix.com>2016-08-30 14:17:30 +0200
committerUlf Hansson <ulf.hansson@linaro.org>2016-09-26 21:31:17 +0200
commit0ed50abb2d8fc81570b53af25621dad560cd49b3 (patch)
tree40bff3a9b00b7e8f5b5f5d4871e9b4cf00b445cf
parent92add82e0ce0946d7aa6f2ae71cd160d914d2f48 (diff)
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mmc: block: don't use CMD23 with very old MMC cards
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@emlix.com> Cc: <stable@vger.kernel.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
-rw-r--r--drivers/mmc/card/block.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 74c7625ee0db..03670aa5ac8e 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;