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

Ziyuan xzy.xu at rock-chips.com
Fri Aug 25 08:16:51 UTC 2017

hi Jaehoon,

On 07/28/2017 09:05 PM, Jaehoon Chung wrote:
> Hi Kever,
> On 07/26/2017 08:33 PM, Kever Yang wrote:
>> Hi Jaehoon,
>>      What's the status of this patch set now?
>>      Can we land this patch set or the other patch set from Ziyuan Xu?
>> The performance for  mmc in U-Boot is really bad now, and this patch set has been
>> on list for more than two months now, I'm using the patch set from Ziyuan Xu locally,
>> but really hope the upstream can move forward.
> Apologized for late. Will try to upstream this before releasing v2017.09.
> Really sorry for late, again. Thanks for reminding this.

Anything update?

> Best Regards,
> Jaehoon Chung
>> Thanks,
>> - Kever
>> On 06/29/2017 05:59 PM, Jaehoon Chung wrote:
>>> On 06/16/2017 07:00 PM, Jean-Jacques Hiblot wrote:
>>>> Hi Jaehoon,
>>>> 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..
>>>>> 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.. :)
>>>> I updated the branches for testing in my github repo (https://github.com/jjhiblot/u-boot.git )
>>>> branch testing-hs200-uhs_v2 touches only the MMC core
>>>> branch high_speed_hsmmc_v2 implements the required bit for th HSMMC found on TI boards
>>> Sorry for late..I make the hs200-ufs-testing branch in u-boot-mmc repo.
>>> I will rebase on latest u-boot. and start the testing.
>>> Best Regards,
>>> Jaehoon Chung
>>>> Most of the comments (if not all of them) have been taken in account and the branches have been rebased on top of u-boot master.
>>>> Will you be able to do some testing and let me know if there are other things to change ? Don't hesitate to let me know what boards it breaks (if any), I'll do my best to get my hands on one and help with the debugging.
>>>> Thanks,
>>>> JJ
>>>>> 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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Ziyuan Xu

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