On 25/05/2017 09:41, Jaehoon Chung wrote:
Hi,

On 05/24/2017 12:24 AM, Jean-Jacques Hiblot wrote:
Hi,


On 18/05/2017 06:27, Jaehoon Chung wrote:
Hi,

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)

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.
After testing my targets, some boards don't work fine..So i'm checking this 
problem..
Jaehoon,

what kind of issues are you running into and on what platforms ?
So far, besides the items brought-up by the reviews, there are 2 issues that 
are in the pipe for the next version:
  * signal voltage selection is not done for the MMCs only for SDs.
  * I noticed a timing constraint in voltage selection for SDs that can be a 
problem when trying a UHS mode with some SDs (seen only with Sandisk Ultra  
64Gb micro SD class I) :  the voltage must be switched quickly after the cmd 
SWITCH_UHS18V has been sent, making debug messages in that context a problem. 
With this SD I've been able to check that SDR104 is working.
How about making the "testing-hs200-uhs" branch for this? It needs to test 
more..
Jaehoon,

Have you been able to track down the issue you had with your boards ? Next week I can borrow some boards if it can help (at91 and imx6 based), have they been part of your tests ?

Also I set up a repository with the code for testing:
g...@github.com:jjhiblot/u-boot.git testing-hs200-uhs_v2

If you have a omap5 based board (dra7 or am57), you can test with this branch that also includes the host support for high speed modes:
g...@github.com:jjhiblot/u-boot.git high_speed_hsmmc

Regards,

Jean-jacques


****
I guess my target doesn't do the voltage change..i'm doing for ufs driver on 
u-boot in my local..
So i didn't see fully..today i have a free time..So i'm doing full review other 
thing..and about pending patches.

Thanks for waiting me.. :)

Best Regards,
Jaehoon Chung

Jean-Jacques
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(-)






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