Re: [PATCH 5/6] spi: loopback-test: add elapsed time check

[Tudor Ambarus <tudor.ambarus@xxxxxxxxxx>]

On 1/18/24 12:42, Mark Brown wrote:
> On Thu, Jan 18, 2024 at 08:30:39AM +0000, Tudor Ambarus wrote:
>> On 1/12/24 18:37, Mark Brown wrote:
> 
>>>> [ 6748.913400] spi-loopback-test spi13.0: elapsed time 532837 ns is
>>>> shorter than minimum estimated time 82240000 ns
> 
>>> That's a *very* substantial error, it makes me suspect that the hardware
>>> might be doing loopback at a stage before it actually clocks the bus and
>>> doing something like just connecting the TX and RX FIFOs.
> 
>> Thanks, Mark! It was a problem on how the clocks were handled, I ended
>> up with a higher frequency than I requested.
> 
> Ouch, hopefully that's only affecting loopback mode and not normal
> operation for everyone.

It was a problem on the clock driver which is not yet upstream. SPI is
fine, in loopback mode at least, that's all I could test for now.