On Tue, 4 May 2021 at 18:12, Ulf Hansson [off-list ref] 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