From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jakub =?UTF-8?B?S2ljacWEc2tp?= Subject: Re: spi-imx: real time operation Date: Wed, 15 Apr 2015 21:36:52 +0200 Message-ID: <20150415213652.102dfb2f@north> References: <20150415170936.3e506e6c@north> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Markus.Niebel-HVi9AzVXQk5Wk0Htik3J/w@public.gmane.org Return-path: In-Reply-To: <20150415170936.3e506e6c@north> Sender: linux-spi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: 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. -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html