linux-kernel - Re: [PATCH 00/11] Initital support for new power/perf features for SD cards

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Date:   Fri, 7 May 2021 09:31:39 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Avri Altman <Avri.Altman@....com>
Cc:     "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/11] Initital support for new power/perf features for SD cards

On Fri, 7 May 2021 at 08:44, Avri Altman <Avri.Altman@....com> wrote:
>
> >
> > In the SD spec v4.x the SD function extension registers were introduced,
> > together with a new set of commands (CMD48/49 and CMD58/59) to read
> > and write
> > to them.
> >
> > Moreover, in v4.x a new standard function for power management features
> > were
> > added, while in v6.x a new standard function for performance
> > enhancements
> > features were added.
> >
> > This series implement the basics to add support for these new features (and
> > includes some additional preparations in patch 1->7), by adding support for
> > reading and parsing these new SD registers. In the final patch we add
> > support
> > for the SD poweroff notification feature, which also add a function to write
> > to
> > these registers.
> >
> > Note that, there are no HW updates need for the host to support
> > reading/parsing
> > of the these new SD registers. This has been tested with a 64GB Sandisk
> > Extreme
> > PRO UHS-I A2 card.
> >
> > Tests and reviews are of course greatly appreciated!
> Echoing an internal discussion about this series:
> "...
> That is very good that there will be a support of the extension registers of SD spec .   It may allow existing and future features to be very easily supported by hosts (like existing power off control and future TCG/RPMB related spec which is currently under definition and is going to use those registers as well..).

Thanks for sharing. I am happy to help!

> ..."
> Therefore for entire series: Acked-by: Avri Altman <avri.altman@....com>

Thanks for reviewing!

Kind regards
Uffe