Re: [PATCH AUTOSEL 4.9 01/13] spi: spi-cadence: Fix SPI CS gets toggling sporadically

[Sasha Levin]

On Tue, Sep 20, 2022 at 03:48:32PM +0200, Pavel Machek wrote:
> Hi!
>
> > From: Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@xxxxxxxxxx>
> >
> > [ Upstream commit 21b511ddee09a78909035ec47a6a594349fe3296 ]
> >
> > As part of unprepare_transfer_hardware, SPI controller will be disabled
> > which will indirectly deassert the CS line. This will create a problem
> > in some of the devices where message will be transferred with
> > cs_change flag set(CS should not be deasserted).
> > As per SPI controller implementation, if SPI controller is disabled then
> > all output enables are inactive and all pins are set to input mode which
> > means CS will go to default state high(deassert). This leads to an issue
> > when core explicitly ask not to deassert the CS (cs_change = 1). This
> > patch fix the above issue by checking the Slave select status bits from
> > configuration register before disabling the SPI.
>
> My records say this was already submitted to AUTOSEL at "Jun
> 27". There are more patches from that era that were reviewed in
> AUTOSEL but not merged anywhere. Can you investigate?

Yup, there was a batch that never went in, going to queue it up for the
next round of releases.

--
Thanks,
Sasha