On Wed, 8 Apr 2020 at 11:46, Wolfram Sang
<wsa+renesas@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> SDHI (with SCC) has a mechanism to select an optimal TAP even if all
> were considered good during the tuning process. This series implements
> support for it. Before that, some refactoring of 'best TAP selection' is
> done to avoid code duplication and get more understandable code.
>
> This work is based on BSP patches by Masaharu Hayakawa and Takeshi
> Saito. It is built on top of mmc/next. For convenience, a branch is
> here:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/sdhi/new_manual_calib
>
> It has been tested on Renesas Salvator-XS boards (R-Car M3-N and R-Car
> H3 ES2.0). There were no regressions detected. HS400 could be tuned the
> same way, and checksumming large files still works.
>
> And while this series is useful by itself, it is also the last
> prerequisite to implement some 'bad tap avoidance' on top which is what
> we are originally aiming for.
>
> Note about backporting: The super useful iterator
> bitmap_for_each_set_region() is only available since v5.6. If you want
> that before, you need to backport the needed bits of e837dfde15a4
> ("bitmap: genericize percpu bitmap region iterators"), too.
>
> Thank you to Shimoda-san for his valuable input since the RFT version
> of this patchset (see patch 1 for details)!
>
> Kind regards,
>
> Wolfram
>
> Wolfram Sang (3):
> mmc: renesas_sdhi: refactor calculation of best TAP
> mmc: renesas_sdhi: clarify handling of selecting TAPs
> mmc: renesas_sdhi: improve TAP selection if all TAPs are good
>
> drivers/mmc/host/renesas_sdhi.h | 2 +
> drivers/mmc/host/renesas_sdhi_core.c | 64 ++++++++++++++--------------
> 2 files changed, 34 insertions(+), 32 deletions(-)
>
> --
> 2.20.1
>
Applied for next, thanks!
Kind regards
Uffe
