From: "Jakub Kiciński" <moorray3-5tc4TXWwyLM@public.gmane.org>
To: Markus.Niebel-HVi9AzVXQk5Wk0Htik3J/w@public.gmane.org
Cc: linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: spi-imx: real time operation
Date: Wed, 15 Apr 2015 21:36:52 +0200 [thread overview]
Message-ID: <20150415213652.102dfb2f@north> (raw)
In-Reply-To: <20150415170936.3e506e6c@north>
On Wed, 15 Apr 2015 17:09:36 +0200, Jakub Kicinski wrote:
> Hi Markus!
>
> I've seen your patch from July which added rt parameter to spi-imx [1].
> If I understand the code correctly spi-imx is using bitbang, therefore
> it uses old SPI API, therefore the message pump does not apply to it,
> therefore setting master->rt has no effect.
>
> Is my understanding correct? If so before I convert spi-imx not to use
> bitbang I would like to ask you if you have not already done it? ;)
>
> Without SPI threads running with RT prio I can't even reliably use an
> sc16is7xx UART at 115200...
>
> [1] http://www.spinics.net/lists/arm-kernel/msg348713.html
Ugh.. I missed 2025172e3280 ("spi/bitbang: Use core message pump"),
working with old kernels bit my in the rear end.
Sorry for the noise.
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prev parent reply other threads:[~2015-04-15 19:36 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-15 15:09 spi-imx: real time operation Jakub Kicinski
2015-04-15 19:36 ` Jakub Kiciński [this message]
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