Re: fsl_espi errors on v5.7.15

[Chris Packham <Chris.Packham@xxxxxxxxxxxxxxxxxxx>]

Hi Again,

On 17/08/20 9:09 am, Chris Packham wrote:

>
> On 14/08/20 6:19 pm, Heiner Kallweit wrote:
>> On 14.08.2020 04:48, Chris Packham wrote:
>>> Hi,
>>>
>>> I'm seeing a problem with accessing spi-nor after upgrading a T2081
>>> based system to linux v5.7.15
>>>
>>> For this board u-boot and the u-boot environment live on spi-nor.
>>>
>>> When I use fw_setenv from userspace I get the following kernel logs
>>>
>>> # fw_setenv foo=1
>>> fsl_espi ffe110000.spi: Transfer done but SPIE_DON isn't set!
>>> fsl_espi ffe110000.spi: Transfer done but SPIE_DON isn't set!
>>> fsl_espi ffe110000.spi: Transfer done but SPIE_DON isn't set!
>>> fsl_espi ffe110000.spi: Transfer done but SPIE_DON isn't set!
>>> fsl_espi ffe110000.spi: Transfer done but SPIE_DON isn't set!
>>> fsl_espi ffe110000.spi: Transfer done but SPIE_DON isn't set!
>>> fsl_espi ffe110000.spi: Transfer done but SPIE_DON isn't set!
>>> fsl_espi ffe110000.spi: Transfer done but SPIE_DON isn't set!
>>> fsl_espi ffe110000.spi: Transfer done but SPIE_DON isn't set!
>>> fsl_espi ffe110000.spi: Transfer done but SPIE_DON isn't set!
>>> fsl_espi ffe110000.spi: Transfer done but SPIE_DON isn't set!
>>> fsl_espi ffe110000.spi: Transfer done but SPIE_DON isn't set!
>>> fsl_espi ffe110000.spi: Transfer done but SPIE_DON isn't set!
>>> fsl_espi ffe110000.spi: Transfer done but SPIE_DON isn't set!
>>> fsl_espi ffe110000.spi: Transfer done but rx/tx fifo's aren't empty!
>>> fsl_espi ffe110000.spi: SPIE_RXCNT = 1, SPIE_TXCNT = 32
>>> fsl_espi ffe110000.spi: Transfer done but rx/tx fifo's aren't empty!
>>> fsl_espi ffe110000.spi: SPIE_RXCNT = 1, SPIE_TXCNT = 32
>>> fsl_espi ffe110000.spi: Transfer done but rx/tx fifo's aren't empty!
>>> fsl_espi ffe110000.spi: SPIE_RXCNT = 1, SPIE_TXCNT = 32
>>> ...
>>>
>> This error reporting doesn't exist yet in 4.4. So you may have an issue
>> under 4.4 too, it's just not reported.
>> Did you verify that under 4.4 fw_setenv actually has an effect?
> Just double checked and yes under 4.4 the setting does get saved.
>>> If I run fw_printenv (before getting it into a bad state) it is able to
>>> display the content of the boards u-boot environment.
>>>
>> This might indicate an issue with spi being locked. I've seen related
>> questions, just use the search engine of your choice and check for
>> fw_setenv and locked.
> I'm running a version of fw_setenv which includes 
> https://gitlab.denx.de/u-boot/u-boot/-/commit/db820159 so it shouldn't 
> be locking things unnecessarily.
>>> If been unsuccessful in producing a setup for bisecting the issue. I do
>>> know the issue doesn't occur on the old 4.4.x based kernel but that's
>>> probably not much help.
>>>
>>> Any pointers on what the issue (and/or solution) might be.

I finally managed to get our board running with a vanilla kernel. With 
corenet64_smp_defconfig I occasionally see

   fsl_espi ffe110000.spi: Transfer done but SPIE_DON isn't set!

other than the message things seem to be working.

With a custom defconfig I see

   fsl_espi ffe110000.spi: Transfer done but SPIE_DON isn't set!
   fsl_espi ffe110000.spi: Transfer done but rx/tx fifo's aren't empty!
   fsl_espi ffe110000.spi: SPIE_RXCNT = 1, SPIE_TXCNT = 32
   ...

and access to the spi-nor does not work until the board is reset.

I'll try and pick apart the differences between the two defconfigs.