linux-kernel - Re: [PATCH 11/11] mmc: core: Add support for Power Off Notification for SD cards

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Message-ID: <CACRpkdbvZarQYREKk8g7NFc6wUveMTDdPVxC7+2ny6p=L63UFA@mail.gmail.com>
Date:   Thu, 6 May 2021 15:07:12 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     linux-mmc <linux-mmc@...r.kernel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Avri Altman <avri.altman@....com>,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        linux-block <linux-block@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 11/11] mmc: core: Add support for Power Off Notification
 for SD cards

On Tue, May 4, 2021 at 6:12 PM Ulf Hansson <ulf.hansson@...aro.org> wrote:

> Rather than only deselecting the SD card via a CMD7, before we cut power to
> it at system suspend, at runtime suspend or at shutdown, let's add support
> for a graceful power off sequence via enabling the SD Power Off
> Notification feature.
>
> Note that, the Power Off Notification feature was added in the SD spec
> v4.x, which is several years ago. However, it's still a bit unclear how
> often the SD card vendors decides to implement support for it. To validate
> these changes a Sandisk Extreme PRO A2 64GB has been used, which seems to
> work nicely.
>
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>

Given how these things work in some quarters I would not be
surprised if some SD card vendors tend to start to implement
this when they see that Linux (Android) has started to support
it. So let's encourage them:
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij