[RFC PATCH v2 0/5] mmc: renesas_sdhi: add manual correction

[Wolfram Sang <wsa+renesas@sang-engineering.com>]

Add manual tap correction because the automatic one fails for HS400 on
Gen3.

Changes since RFC v1:

* rebased to mmc/next
* added review tags from Shimoda-san
* fixed "enforce" in one commit message (Thanks Geert!)
* new patch 3/5: I think it makes sense to incorporate this patch from
  the BSP here already because it enhances manual correction. It could
  be argued if it should be merged with 2/5, yet for easier review I
  left it seperate for now
* new patch 5/5: a cleanup I came up with while working on 3/5.

I kept all tap_related variables 'unsigned long' for now. Geert has a
point that some of them could be changed to 'unsigned int'. I'd like to
leave this as a seperate issue, though, once we dealt with the other
HS400 issues. (Yes, more patches coming...)

I did some more testing but with my environment here, I hardly see taps
changing. What I see is that with HS400 RVSERR is regularly set but
SMPCMP is all cleared. So, this series maybe saves some unneeded tuning
for me. But I think the relevant cases are created in a lab, so some
more testing would be much appreciated. We definately want to wait for
Shimoda-san's comments before applying this.

This series depends on mmc/next because of this other series:
[PATCH 0/5] mmc: renesas_sdhi: prepare for recent HS400 updates

A branch is here:
git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/sdhi/new_manual_calib

Kind regards,

   Wolfram


Takeshi Saito (2):
  mmc: renesas_sdhi: Add manual correction
  mmc: renesas_sdhi: only check CMD status for HS400 manual correction

Wolfram Sang (3):
  mmc: renesas_sdhi: remove double clear of automatic correction
  mmc: renesas_sdhi: enforce manual correction for Gen3
  mmc: renesas_sdhi: cleanup SCC defines

 drivers/mmc/host/renesas_sdhi.h      |   1 +
 drivers/mmc/host/renesas_sdhi_core.c | 104 ++++++++++++++++++++++-----
 2 files changed, 86 insertions(+), 19 deletions(-)

-- 
2.20.1