linux-kernel - Re: [PATCH] mmc: renesas_sdhi_internal_dmac: Add MMC_CAP

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Date:   Tue, 12 Nov 2019 21:49:52 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Eugeniu Rosca <erosca@...adit-jv.com>
Cc:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Niklas Söderlund <niklas.soderlund@...natech.se>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Simon Horman <horms+renesas@...ge.net.au>,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        Eugeniu Rosca <roscaeugeniu@...il.com>,
        Harish Jenny K N <harish_kandiga@...tor.com>,
        Andrew Gabbasov <andrew_gabbasov@...tor.com>
Subject: Re: [PATCH] mmc: renesas_sdhi_internal_dmac: Add MMC_CAP_ERASE to
 Gen3 SoCs

On Tue, Nov 12, 2019 at 02:48:08PM +0100, Eugeniu Rosca wrote:
> From: Harish Jenny K N <harish_kandiga@...tor.com>
> 
> Enable MMC_CAP_ERASE capability in the driver to allow
> erase/discard/trim requests.
> 
> Suggested-by: Andrew Gabbasov <andrew_gabbasov@...tor.com>
> Signed-off-by: Harish Jenny K N <harish_kandiga@...tor.com>
> [erosca: Forward-port and test on v5.4-rc7 using H3ULCB-KF:
>          "blkdiscard /dev/mmcblk0" passes with this patch applied
>          and complains otherwise:
> 	 "BLKDISCARD ioctl failed: Operation not supported"]
> Signed-off-by: Eugeniu Rosca <erosca@...adit-jv.com>

Looks good to me. Just a generic question, probably more for Ulf:

Why does this CAP_ERASE exist? As I understand, the driver only needs to
set the flag and no further handling is required. Why would a driver not
set this flag and not support erase/trim commands?

Kind regards,

   Wolfram


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