[U-Boot] [PATCH 00/22] mmc: Add support for HS200 and UHS modes

[Jaehoon Chung]

Hi Jean,

On 05/13/2017 03:16 AM, Jean-Jacques Hiblot wrote:
> This series brings support for HS200 and UHS modes to the mmc core.
> It has been tested with the hsmmc driver on several platforms (DRA7,
> AM57x, AM437x, beaglebone black). Some modifications are required in
> the host driver to take advantage of this (voltage switching, tuning).
> The changes to the host driver will be posted a another series as this
> one is already long enough. 
> 
> The series starts with a small refactoring of th sd/mmc startup. The first 4 commits
> are mostly moving code around with little or no functionnal change.
> 
> Then the notion of "mode" is introduced. Until now, this information wasn't
> kept in struct mmc. Only the clock and a flag for ddr was kept. Later the mode
> information will be used to select the clock frequency, the ddr flag and the
> tuning procedure. It will be also be check against the host capabilities.
> 
> Then comes the big refactoring job in:
> "mmc: refactor MMC startup to make it easier to support new modes" and
> "mmc: refactor SD startup to make it easier to support new modes"
> Since the number of modes is increasing, it makes sense to try them in a more
> organized way. those commits use a list of supported modes and iterate through
> them to find the best working one. It also allows to switch more easilly from
> one mode to another (switching from HS200 to DDR52 to access boot partitions for example)

Thanks for sending patches. After testing your patches, i will reply.

Best Regards,
Jaehoon Chung

> 
> Then there are a couple of new callback added to:
> - enable/disable Vdd
> - check if the card is busy (used during UHS voltage switching)
> - select the IO voltage
> 
> Then Power cycle is added. Without power cycle, if a UHS card fails to enumerate in
> UHS mode, it can't fall back to high speed mode and card enumeration will fail.
> 
> And finally the last commits add the support for HS200 and UHS.
> I haven't been able to test the UHS SDR104 mode by lack of compatible sdcard.
> 
> With this in place and the required changes in the HSMMC (including DAM), we observe significant
> improvements in the performances on a DRA7 evm:
> eMMC HS200: 130 MB/s
> eMMC DDR52: 80 MB/s
> sd   SDR50: 80 MB/s
> 
> cheers,
> 
> Jean-Jacques
> 
> 
> Jean-Jacques Hiblot (18):
>   mmc: split mmc_startup()
>   mmc: move the MMC startup for version above v4.0 in a separate
>     function
>   mmc: make ext_csd part of struct mmc
>   mmc: add a function to read and test the ext csd (mmc >= 4)
>   mmc: introduces mmc modes.
>   mmc: Add a fonction to dump the mmc capabilities
>   mmc: use mmc modes to select the correct bus speed
>   cmd: mmc: display the mode name and current bus speed in the mmc info
>   mmc: refactor SD startup to make it easier to support new modes
>   mmc: refactor MMC startup to make it easier to support new modes
>   mmc: make mmc_set_ios() return status
>   mmc: add power cyle support in mmc core
>   mmc: add a new mmc parameter to disable mmc clock
>   mmc: Add a execute_tuning() callback to the mmc operations.
>   mmc: add HS200 support in MMC core
>   mmc: Add a new callback function to check if the card is busy
>   mmc: Add support for UHS modes
>   mmc: Change mode when switching to a boot partition
> 
> Kishon Vijay Abraham I (3):
>   mmc: Enable signal voltage to be selected from mmc core
>   mmc: Add a new callback function to enable/disable vdd
>   mmc: disable the mmc clock during power off
> 
> Vignesh R (1):
>   mmc: Retry some MMC cmds on failure
> 
>  cmd/mmc.c                |    3 +-
>  drivers/mmc/fsl_esdhc.c  |    2 +-
>  drivers/mmc/mmc-uclass.c |   42 ++
>  drivers/mmc/mmc.c        | 1220 +++++++++++++++++++++++++++++++++-------------
>  include/mmc.h            |  138 +++++-
>  5 files changed, 1058 insertions(+), 347 deletions(-)
>