Error fsl_esdhc: Internal clock never stabilised.

[Pali Rohár]

On Friday 29 April 2022 13:50:31 Sinan Akman wrote:
> 
>   Hi Pali
> 
> On 2022-04-29 1:35 p.m., Pali Rohár wrote:
> > Hello!
> > 
> > U-Boot prints error "fsl_esdhc: Internal clock never stabilised." on
> > P2020 everytime when trying to access SD card. It happens with every
> > tested SD card. Note that both read and write operation with SD card is
> > working fine, U-Boot just prints that noisy error.
> > 
> > For example:
> > 
> >    SD boot...
> >    No max bus width provided. Assume 8-bit supported.
> >    Second program loader running in sram...
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> > 
> > Or:
> > 
> >    => mmc info
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    fsl_esdhc: Internal clock never stabilised.
> >    Device: FSL_SDHC
> >    Manufacturer ID: 3
> >    OEM: 5344
> >    Name: SA16G
> >    Bus Speed: 50000000
> >    Mode: SD High Speed (50MHz)
> >    Rd Block Len: 512
> >    SD version 3.0
> >    High Capacity: Yes
> >    Capacity: 14.8 GiB
> >    Bus Width: 1-bit
> >    Erase Group Size: 512 Bytes
> > 
> > I tried to bisect this error and I figured out that U-Boot prints this
> > error since beginning when this error message was added into fsl_esdhc
> > driver.
> > 
> > Do you have any idea what is wrong? And how to fix it?
> 
>     AFAIR this is related to the issue that some of the the register
> fields did not exist in p2020 and the patch was added for T series.
> Please take a look at the reference manuals and verify that the
> register that the code checks did not exist in P2020. In this case
> I believe you can simple exclude this check with #ifdef P2020 or
> something to this effect.
> 
>   Thanks
>   Sinan Akman

Thank you very much! I will send a patch shortly.