linux-kernel - Re: [PATCH v5 10/23] mtd: nand: denali: rework interrupt handling

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Message-ID: <CAK7LNARCVua6zXvCzd+3UugXF-mAOs3GwVXYPis6ndtS1D8ntw@mail.gmail.com>
Date:   Fri, 9 Jun 2017 02:30:12 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:     Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Dinh Nguyen <dinguyen@...nel.org>,
        linux-mtd@...ts.infradead.org,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Chuanxiao Dong <chuanxiao.dong@...el.com>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Brian Norris <computersforpeace@...il.com>,
        Enrico Jorns <ejo@...gutronix.de>,
        David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH v5 10/23] mtd: nand: denali: rework interrupt handling

2017-06-09 2:26 GMT+09:00 Masahiro Yamada <yamada.masahiro@...ionext.com>:

> ->dev_ready() is optional, but we may end up with waiting more than needed.
>
>         case NAND_CMD_RESET:
>                 if (chip->dev_ready)
>                          break;
>                 udelay(chip->chip_delay);
>
>
> chip->chip_delay is probably set large enough, so this is not optimal.

I misunderstood the code.

The following line will be the most of the part of delay.

     nand_wait_status_ready(mtd, 250);


-- 
Best Regards
Masahiro Yamada