Re: sdhci-esdhc-imx : cannot read eMMC

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On Wed, Sep 3, 2014 at 4:25 PM, Jean-Michel Hautbois
<jhautbois@xxxxxxxxx> wrote:
> 2014-09-03 10:15 GMT+02:00 Dong Aisheng <dongas86@xxxxxxxxx>:
>> Hi JM,
>
> Hi Dong,
>
>> On Tue, Sep 2, 2014 at 11:10 PM, Jean-Michel Hautbois
>> <jhautbois@xxxxxxxxx> wrote:
>>> 2014-09-02 11:20 GMT+02:00 Jean-Michel Hautbois
>>> <jean-michel.hautbois@xxxxxxxxxxx>:
>>>> Hi there,
>>>>
>>>> I start a new thread, as I have done lots of test and this will be clearer.
>>>> I have problems reading and writing eMMC on my i.MX6 board with 3.17-rc3.
>>>> Sometimes I don't have read errors explicitly in dmesg, but fdisk has
>>>> no effects.
>>>> I activated MMC debug in my config file, and here is an extract of
>>>> mmc0 register dump and all mmc1 part.
>>>> On Freescale kernel, I confirm it works well with the same board and
>>>> sample, I can write a partition on mmc1.
>>>
>>
>> My iMX6Q SabreSD board seems ok.
>> What board did you use?
>> What reading/writing problems did you meet?
>> I did not see errors in your log.
>> Can you paste the error log?
>
> This is a custom board.
> You are right, activating debug seems to make the problem disappear...
> I have CRC errors and my CMD signal is quite bad when this is happening.
> I asked an HW engineer to look at this.
>
> I also double checked the pads, and added the
> MX6QDL_PAD_NANDF_ALE__SD4_RESET pad, but the reset signal is always
> down when doing this, when it should go down then up...
>

The sdhci-esdhc-imx driver does not implement hw_reset support via
eMMC reset pin.

Regards
Dong Aisheng

> Thanks,
> JM
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