Re: [PATCH 1/4] spi: lantiq: Synchronize interrupt handlers and transfers

[Dilip Kota]

On 5/6/2020 3:40 PM, Dilip Kota wrote:
> On 5/5/2020 7:23 PM, Mark Brown wrote:
> > On Mon, May 04, 2020 at 06:15:47PM +0800, Dilip Kota wrote:
> > > On 4/29/2020 8:13 PM, Mark Brown wrote:
> >
> > > I just tried to get the history of removing workqueue in SPI driver, on
> > > GRX500 (earlier chipset of LGM) the SPI transfers got timedout with
> > > workqueues during regression testing. Once changed to threaded IRQs
> > > transfers are working successfully.
> > That doesn't really explain why though, it just explains what.
> I didnt find more information about it. I will work to reproduce the 
> issue and share the detailed information sooner i get the 
> accessibility of the SoC (because of covid19 doing wfh)

I got the GRX500 setup and reproduced the timeout issue.
[   88.721883] spi-loopback-test spi1.2: SPI transfer timed out
[   88.726488] spi-loopback-test spi1.2: spi-message timed out - 
reruning...
[   88.961786] spi-loopback-test spi1.2: SPI transfer timed out
[   88.966027] spi-loopback-test spi1.2: Failed to execute spi_message: 
-145

Timeout is happening because of not acknowledging or not clearing the 
interrupt status registers. Workqueue is not causing any issue,
I am working on the changes, will submit the patches for review.

Regards,
Dilip

> Regards,
> Dilip