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[0/4] mmc: core: Read/parse SD function extension registers

Message ID 20210421103154.169410-1-ulf.hansson@linaro.org
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Series mmc: core: Read/parse SD function extension registers | expand

Message

Ulf Hansson April 21, 2021, 10:31 a.m. UTC 
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(-)

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2.25.1