[PATCH v2 0/2] mmc: block: use single block write in retry

[Bin Liu <b-liu@ti.com>]

Due to errata i2493[0], multi-block write would still fail in retries.

With i2493, the MMC interface has the potential of write failures when
issuing multi-block writes operating in HS200 mode with excessive IO
supply noise.

While the errata provides guidance in hardware design and layout to
minimize the IO supply noise, in theory the write failure cannot be
resolved in hardware. The software solution to ensure the data integrity
is to add minimum 5us delay between block writes. Single-block write is
the practical way to introduce the delay.

This patch set reuses recovery_mode flag, and switches to single-block
write in retry when multi-block write fails. It covers both CQE and
non-CQE cases.

link to v1:
    https://lore.kernel.org/linux-mmc/20260310160408.3976760-1-b-liu@ti.com/T/#u

[0] https://www.ti.com/lit/pdf/sprz582
Signed-off-by: Bin Liu <b-liu@ti.com>

Bin Liu (2):
  block: define new rqf_flags RQF_XFER_SINGLE_BLK
  mmc: block: use single block write in retry

 block/blk-mq-debugfs.c   |  1 +
 drivers/mmc/core/block.c | 12 ++++++++++--
 include/linux/blk-mq.h   |  3 +++
 3 files changed, 14 insertions(+), 2 deletions(-)

-- 
2.34.1