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

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Message-ID: <DM6PR04MB65750A91FDC869FD3ABFE27AFC579@DM6PR04MB6575.namprd04.prod.outlook.com>
Date:   Fri, 7 May 2021 06:44:46 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Adrian Hunter <adrian.hunter@...el.com>
CC:     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

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