[PATCH v4 0/3] mmc: tmio: fix reset operation

["Niklas Söderlund" <niklas.soderlund+renesas@ragnatech.se>]

Hi,

While looking at the Renesas BSP kernel I found patches which improves
the state of the hardware at probe and after runtime resume.

Patch 1/3 make sure the module clock is enabled after resuming before
register are accessed. Patch 2/3 is the real change in this series and
brings in reset of the vendor specific callback when resetting (SCC in
the Renesas case). While 3/3 simply make sure that the IRQ mask for
Renesas boards (Gen2 and later) are in a good shape after probe (and
reset).

In addition to addressing the state after resuming it helped unbreak a
SD card I have which are very problematic on Koelsch. Without this
series inserting the card results in:

sh_mobile_sdhi ee100000.sd: timeout waiting for hardware interrupt (CMD19)
sh_mobile_sdhi ee100000.sd: timeout waiting for hardware interrupt (CMD19)
sh_mobile_sdhi ee100000.sd: timeout waiting for hardware interrupt (CMD19)
sh_mobile_sdhi ee100000.sd: timeout waiting for hardware interrupt (CMD19)
sh_mobile_sdhi ee100000.sd: timeout waiting for hardware interrupt (CMD19)
sh_mobile_sdhi ee100000.sd: timeout waiting for hardware interrupt (CMD19)
sh_mobile_sdhi ee100000.sd: timeout waiting for hardware interrupt (CMD19)
sh_mobile_sdhi ee100000.sd: timeout waiting for hardware interrupt (CMD19)
sh_mobile_sdhi ee100000.sd: timeout waiting for hardware interrupt (CMD19)
sh_mobile_sdhi ee100000.sd: timeout waiting for hardware interrupt (CMD19)
sh_mobile_sdhi ee100000.sd: Tuning procedure failed
mmc0: tuning execution failed: -5
mmc0: error -5 whilst initialising SD card
sh_mobile_sdhi ee100000.sd: timeout waiting for hardware interrupt (CMD19)

While with this series applied (patch 2/3):

sh_mobile_sdhi ee100000.sd: timeout waiting for hardware interrupt (CMD19)
mmc0: new ultra high speed SDR50 SDHC card at address aaaa
mmcblk0: mmc0:aaaa SU04G 3.69 GiB
 mmcblk0: p1 p2

Patch 1/3 was previously part of 2/3 but as it deals with a unrelated
issue it's here broken out to a separate patch. Patch 3/3 have once been
posted outside this series bit after comments from Wolfram it's brought
back as it now deepens on 2/3.

Most changes in this series are based on similar work from Masaharu
Hayakawa but for this version all changes now differ quiet a lot from
his work.  All mails sent to him bounce with a "Undelivered Mail
Returned to Sender" error. I therefor felt the need to claim authorship
as I don't want to post blame of my (potential) mistakes on some else.

Niklas Söderlund (3):
  mmc: tmio: enable module clock before resetting when resuming
  mmc: tmio: fix reset operation
  mmc: renesas_sdhi: add initial setting of interrupt mask register

 drivers/mmc/host/renesas_sdhi_core.c |  4 ++++
 drivers/mmc/host/tmio_mmc.h          |  1 +
 drivers/mmc/host/tmio_mmc_core.c     | 27 +++++++++++++++------------
 3 files changed, 20 insertions(+), 12 deletions(-)

-- 
2.19.1