linux-kernel - RE: [PATCH v1 2/2] mmc-utils: Add note for CMDQ_MODE

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Date:   Mon, 15 Nov 2021 09:07:26 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Bean Huo <huobean@...il.com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "beanhuo@...ron.com" <beanhuo@...ron.com>
Subject: RE: [PATCH v1 2/2] mmc-utils: Add note for CMDQ_MODE_EN runtime value

 
> From: Bean Huo <beanhuo@...ron.com>
> 
> Since the Linux kernel commit 70b52f090805 ("mmc: block: Disable CMDQ on
> the ioctl path"), CMDQ in CMDQ_MODE_EN[15] is disabled before reading
> EXT_CSD.
> Therefore, it is more accurate to use sysfs node to check CMDQ_MODE_EN
> value.
> Add a note print to highlight.
> 
> Signed-off-by: Bean Huo <beanhuo@...ron.com>
Acked-by: Avri Altman <avri.altman@....com>

> ---
>  mmc_cmds.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/mmc_cmds.c b/mmc_cmds.c
> index ecbde3937c81..46c5f5faae02 100644
> --- a/mmc_cmds.c
> +++ b/mmc_cmds.c
> @@ -1885,6 +1885,8 @@ int do_read_extcsd(int nargs, char **argv)
>                        (ext_csd[EXT_CSD_CMDQ_DEPTH] & 0x1f) + 1);
>                 printf("Command Enabled [CMDQ_MODE_EN]: 0x%02x\n",
>                        ext_csd[EXT_CSD_CMDQ_MODE_EN]);
> +               printf("Note: CMDQ_MODE_EN may not indicate the runtime
> CMDQ ON or OFF.\n"
> +                      "Please check sysfs node
> + '/sys/devices/.../mmc_host/mmcX/mmcX:XXXX/cmdq_en'\n");
>         }
>  out_free:
>         return ret;
> --
> 2.25.1