[PATCH 0/8] mmc: sdhci-esdhc-imx: add SD3.0 support

[Dong Aisheng]

Hi Ulf,

On Thu, Sep 5, 2013 at 3:42 PM, Ulf Hansson <ulf.hansson at linaro.org> wrote:
> On 4 September 2013 14:54, Dong Aisheng <b29396 at freescale.com> wrote:
>> This patch series add SD3.0 support for i.MX6Q/DL.
>> Since freescale i.MX6Q/DL uSDHC clock tuning progress is a little different from
>> the standard tuning process defined in host controller spec v3.0.
>> So we add a hook to allow execute platform specific tuning instead of
>> standard host controller tuning.
>>
>> The main difference are:
>> 1) not only generate Buffer Read Ready interrupt when tuning is performing.
>> It generates all other DATA interrupts like the normal data command.
>> 2) SDHCI_CTRL_EXEC_TUNING is not automatically cleared by HW,
>> instead it's controlled by SW.
>> 3) SDHCI_CTRL_TUNED_CLK is not automatically set by HW,
>> it's controlled by SW.
>> 4) the clock delay for every tuning is set by SW.
>
> An overall question. Do you have any thoughts around periodic/idle
> re-tuning. It is has nothing directly to do with this patchset, but
> since you implemented the tuning sequence here, maybe you have some
> thoughts around it?
>

It seems sdhci already implements re-tuning mode1 based on timer.
The i.MX6 supports auto-retuning, so we may not use timer
based(periodic) re-tuning.
I plan to add auto-retuning support based on standard host
controller spec into sdhci driver later if no one else does it.

Regards
Dong Aisheng

> Kind regards
> Ulf Hansson
>
>>
>> Tested on i.MX6Q Sabreauto board.
>>
>> The series is based on latest Linus tree.
>>
>> Dong Aisheng (8):
>>   mmc: sdhci: add hooks for platform specific tuning
>>   mmc: sdhci: allow platform access of sdhci_send_command
>>   sdhci: sdhci-esdhc-imx: support real clock on and off for imx6q
>>   sdhci: sdhci-esdhci-imx: add sd3.0 clock tuning support
>>   sdhci: sdhci-esdhc-imx: change pinctrl state according to uhs mode
>>   mmc: sdhci-esdhc: correct pre_div for imx6q
>>   mmc: sdhci-esdhc: set actual_clock in clock setting
>>   ARM: dts: imx6qdl: add uhs pinctrl state for usdhc3
>>
>>  arch/arm/boot/dts/imx6dl.dtsi               |   33 +++
>>  arch/arm/boot/dts/imx6q.dtsi                |   33 +++
>>  arch/arm/boot/dts/imx6qdl-sabreauto.dtsi    |    4 +-
>>  drivers/mmc/host/sdhci-esdhc-imx.c          |  307 ++++++++++++++++++++++++++-
>>  drivers/mmc/host/sdhci-esdhc.h              |   35 +++-
>>  drivers/mmc/host/sdhci.c                    |   12 +-
>>  drivers/mmc/host/sdhci.h                    |    3 +
>>  include/linux/platform_data/mmc-esdhc-imx.h |    4 +
>>  8 files changed, 419 insertions(+), 12 deletions(-)
>>
>>
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