linux-kernel - Re: [PATCH v2 0/2] mtd: nand: wait for tWHR, and fix the setup_data

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Date:   Fri, 29 Sep 2017 14:26:35 +0200
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-mtd@...ts.infradead.org,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        linux-kernel@...r.kernel.org, Marek Vasut <marek.vasut@...il.com>,
        Brian Norris <computersforpeace@...il.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH v2 0/2] mtd: nand: wait for tWHR, and fix the
 setup_data_interface of Denali

On Fri, 29 Sep 2017 19:38:38 +0900
Masahiro Yamada <yamada.masahiro@...ionext.com> wrote:

> 1/2 : add NAND_WAIT_TWHR and nand_whr_delay().
>       You can set this new flag if you want nand_command(_lp)
>       to insert tWHR delay where needed.
> 
> 2/2 : Fix Denali setup_data_interface.
>       Boris' suggestion in v1 was a good reminder that
>       made me realize tCCS was missing in the driver.  Fix it now.
> 
> 
> Changes in v2:
>   - Add nand_whr_delay() helper
>     Wait for tWHR only for drivers that explicitly set NAND_WAIT_TWHR flag
>   - newly added
> 
> Masahiro Yamada (2):
>   mtd: nand: wait for tWHR after NAND_CMD_STATUS / NAND_CMD_READID

Hm, I thought you were introducing this to then use it in the denali
driver. Sorry, but I don't want to apply something that nobody needs.
If someone ever complains about a missing delay I'll point him to your
patch, but until then I'll keep the core unchanged.

>   mtd: nand: denali: fix setup_data_interface to meet tCCS delay

This one is valid. I'll queue it to nand/next soon.

Thanks,

Boris

> 
>  drivers/mtd/nand/denali.c    | 10 ++++++++--
>  drivers/mtd/nand/nand_base.c | 21 +++++++++++++++++++--
>  include/linux/mtd/rawnand.h  | 13 ++++++++-----
>  3 files changed, 35 insertions(+), 9 deletions(-)
>