mmc: block: don't use CMD23 with very old MMC cards

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commit 0ed50abb2d 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@emlix.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

This commit is contained in:

Daniel Glöckner 2016-08-30 14:17:30 +02:00 • committed by Ben Hutchings

parent bfd041f0c8

commit 041ec31435

1 changed files with 2 additions and 1 deletions

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drivers/mmc/card/block.c

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