linux-kernel - Re: [PATCH 09/11] mmc: core: Read the SD function extension registers for power management

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Message-ID: <CACRpkdb_qqJJ2aXb+bCxzm1yoeAy0qeUitCVByFNKinAa4zGhw@mail.gmail.com>
Date:   Thu, 6 May 2021 15:04:12 +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 09/11] mmc: core: Read the SD function extension registers
 for power management

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

> In SD spec v4.x the SD function extension registers were introduced. A
> specific function register were added to let the card announce support for
> optional features in regards to power management. The features that were
> added are "Power Off Notification", "Power Down Mode" and "Power
> Sustenance".
>
> As a first step, let's read and parse this register for power management
> during the SD card initialization and store the information about the
> supported features in the struct mmc_card. In this way, we prepare for
> subsequent changes to implement the complete support for the new features.
>
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>

Looks to me like it will work just fine.
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij