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

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Date:   Tue, 11 May 2021 12:56:41 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     linux-mmc <linux-mmc@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.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>,
        Avri Altman <avri.altman@....com>,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        linux-block <linux-block@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/11] Initital support for new power/perf features for SD cards

On Tue, 4 May 2021 at 18:12, Ulf Hansson <ulf.hansson@...aro.org> 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!
>
> Kind regards
> Ulf Hansson
>
> Ulf Hansson (11):
>   mmc: core: Drop open coding when preparing commands with busy
>     signaling
>   mmc: core: Take into account MMC_CAP_NEED_RSP_BUSY for eMMC HPI
>     commands
>   mmc: core: Re-structure some code in __mmc_poll_for_busy()
>   mmc: core: Extend re-use of __mmc_poll_for_busy()
>   mmc: core: Enable eMMC sleep commands to use HW busy polling
>   mmc: core: Prepare mmc_send_cxd_data() to be re-used for additional
>     cmds
>   mmc: core: Drop open coding in mmc_sd_switch()
>   mmc: core: Parse the SD SCR register for support of CMD48/49 and
>     CMD58/59
>   mmc: core: Read the SD function extension registers for power
>     management
>   mmc: core: Read performance enhancements registers for SD cards
>   mmc: core: Add support for Power Off Notification for SD cards
>
>  drivers/mmc/core/core.c    |  22 +--
>  drivers/mmc/core/mmc.c     |  43 ++---
>  drivers/mmc/core/mmc_ops.c | 137 +++++++-------
>  drivers/mmc/core/mmc_ops.h |  10 +-
>  drivers/mmc/core/sd.c      | 371 ++++++++++++++++++++++++++++++++++++-
>  drivers/mmc/core/sd_ops.c  |  38 +---
>  include/linux/mmc/card.h   |  22 +++
>  include/linux/mmc/sd.h     |   4 +
>  8 files changed, 504 insertions(+), 143 deletions(-)

FYI, this series has been applied for next, with some minor
modifications according to review comments. Thanks!

Kind regards
Uffe