linux-kernel - [PATCH 0/4] mmc: core: Read/parse SD function extension registers

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Date:   Wed, 21 Apr 2021 12:31:50 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     linux-mmc@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Cc:     Shawn Lin <shawn.lin@...k-chips.com>,
        Avri Altman <avri.altman@....com>,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/4] mmc: core: Read/parse SD function extension registers

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 doesn't implement the complete support for any of the new
power/perf features, but starts out by reading and parsing the new registers
and stores the information in the struct mmc_card about what features the SD
card supports.

Note that, there are no HW updates need for the host to support reading/parsing
of the these new SD registers.

Tested with a 64GB Sandisk Extreme PRO UHS-I A2 card. Additional tests and
reviews are of course greatly appreciated.

Kind regards
Ulf Hansson

Ulf Hansson (4):
  mmc: core: Parse the SD SCR register for support of CMD48/49 and
    CMD58/59
  mmc: core: Prepare mmc_send_cxd_data() to be used for CMD48 for SD
    cards
  mmc: core: Read the SD function extension registers for power
    management
  mmc: core: Read performance enhancements registers for SD cards

 drivers/mmc/core/mmc_ops.c |  11 +-
 drivers/mmc/core/mmc_ops.h |   2 +
 drivers/mmc/core/sd.c      | 222 ++++++++++++++++++++++++++++++++++++-
 include/linux/mmc/card.h   |  21 ++++
 include/linux/mmc/sd.h     |   3 +
 5 files changed, 252 insertions(+), 7 deletions(-)

-- 
2.25.1