linux-kernel - Re: [PATCH v2 RESENT] mmc-utils: Add General command CMD56 read support

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Date:   Fri, 22 Apr 2022 21:41:45 +0200
From:   Bean Huo <huobean@...il.com>
To:     ulf.hansson@...aro.org, adrian.hunter@...el.com,
        jakob.rossler@...ia.com, Avri.Altman@....com
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bean Huo <beanhuo@...ron.com>
Subject: Re: [PATCH v2 RESENT] mmc-utils: Add General command CMD56 read
 support

On Sun, 2022-04-17 at 13:16 +0200, Bean Huo wrote:
> From: Bean Huo <beanhuo@...ron.com>
> 
> We can use GEN_CMD (CMD56) to read a  data block with vendor-specific
> format and meaning, which is very helpful and useful for customers to
> analyze device health. This patch is to add support for this command.
> 
> At the same time, in order to make CMD56 universal, let more users of
> mmc-utils can benefit from this. We will allow the user to enter
> [arg]
> for special commands. Because some eMMC vendors provide an additional
> set of commands beyond the GEN_CMD (CMD56) definition in the JEDEC
> specification. These additional commands are implemented using
> generic
> CMD56 commands, and they return a wealth of useful information about
> the
> state of the NAND device. For these special purposes, the [31:1]stuff
> bits in the CMD56 argument are used. You can refer to  Micron eMMC
> "TN-FC-32: e·MMC Device Health Report" as an example.
> 
> I didn't add data parsing, just print the raw data as it is vendor-
> specific.
> 
> Signed-off-by: Bean Huo <beanhuo@...ron.com>
> Acked-by: Avri Altman <Avri.Altman@....com>
> Tested-by: Rossler Jakob (Nokia - DE/Ulm) <jakob.rossler@...ia.com>
> ---

Hi Ullf,

Would you be willing to merge this patch into your mmc-utils git repo?

Kind regards,
Bean