[RFT,0/3] mmc: tmio: honor busy timeouts properly

Message

Wolfram Sang Nov. 20, 2020, 2:26 p.m. UTC

TMIO has a HW busy timeout detection which was always running but the
driver did not handle it yet in a proper way. This series fixes that.

Patch 1 sets max_busy_timeout, so the MMC core will not use R1B when it
is beyond the maximum HW timeout. Patch 2 adds proper handling of the
timeout interrupt. After ensuring both, we can finally enable the
WAIT_WHILE_BUSY capability to save the polling.

This was tested using my Renesas Salvator-XS (R-Car M3-N) and Lager
(R-Car H2). However, more advanced testing from the BSP team and/or
Shimoda-san would be much appreciated.

The branch is based on mmc/next plus one patch "[PATCH] mmc: tmio: Fix
command error processing". A branch is available here:

git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/sdhi/busy_timeout

Yamada-san: I enabled setting max_busy_timeout for Uniphier as well
because I am quite sure this HW supports it and it will fix timeout
issues with long erase timeouts. I did not enable WAIT_WHILE_BUSY
because this is "only" an improvement and not a fix. I think opt-in
after some testing is good for that case.

I think all patches are 5.11 material to get enough testing. Patch 1
is IMHO stable material, nonetheless. I am open for discussions, of
course.

Looking forward to comments, reviews, tags...

Thanks and happy hacking,

   Wolfram


Masaharu Hayakawa (1):
  mmc: tmio: Add data timeout error detection

Wolfram Sang (2):
  mmc: tmio: set max_busy_timeout
  mmc: renesas_sdhi: enable WAIT_WHILE_BUSY

 drivers/mmc/host/renesas_sdhi_core.c          |  3 ++
 drivers/mmc/host/renesas_sdhi_internal_dmac.c |  4 +--
 drivers/mmc/host/renesas_sdhi_sys_dmac.c      |  7 ++--
 drivers/mmc/host/tmio_mmc.h                   |  8 +++--
 drivers/mmc/host/tmio_mmc_core.c              | 32 +++++++++++++++----
 drivers/mmc/host/uniphier-sd.c                |  1 +
 include/linux/mfd/tmio.h                      |  7 +++-
 7 files changed, 48 insertions(+), 14 deletions(-)