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

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Message-ID: <20200505112339.GC5377@sirena.org.uk>
Date:   Tue, 5 May 2020 12:23:39 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Dilip Kota <eswara.kota@...ux.intel.com>
Cc:     Daniel Schwierzeck <daniel.schwierzeck@...il.com>, robh@...nel.org,
        linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, hauke@...ke-m.de,
        andriy.shevchenko@...el.com, cheol.yong.kim@...el.com,
        chuanhua.lei@...ux.intel.com, qi-ming.wu@...el.com
Subject: Re: [PATCH 1/4] spi: lantiq: Synchronize interrupt handlers and
 transfers

On Mon, May 04, 2020 at 06:15:47PM +0800, Dilip Kota wrote:
> On 4/29/2020 8:13 PM, Mark Brown wrote:

> > > Workqueue has a higher chances of causing SPI transfers timedout.
> > because...?

> 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.

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