linux-kernel - RE: [PATCH 1/1] spi: pxa2xx: add driver enabling message

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Date:   Wed, 10 Apr 2019 08:47:53 +0000
From:   Flavio Suligoi <f.suligoi@...m.it>
To:     Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        "Robert Jarzmik" <robert.jarzmik@...e.fr>,
        Mark Brown <broonie@...nel.org>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/1] spi: pxa2xx: add driver enabling message

> On 4/10/19 11:13 AM, Flavio Suligoi wrote:
> >> [    9.506895] pxa2xx-spi pxa2xx-spi.13: no DMA channels available,
> >> using PIO
> >> [    9.516770] pxa2xx-spi pxa2xx-spi.13: registered master spi2
> >> [    9.518527] pxa2xx-spi pxa2xx-spi.13: PXA2xx SPI master controller
> >> (PIO mode)
> >
> > I have added this message because, using an x86 machine, the message:
> >
> > "pxa2xx-spi pxa2xx-spi.13: registered master spi2"
> >
> > doesn't appear in the kernel messages!
> >
> Yeah, it needs CONFIG_SPI_DEBUG.
> 
> >> Actually this info message doesn't necessarily tell will the driver end
> >> up using DMA for transfers. See pxa2xx_spi_can_dma() and
> >> pxa2xx_spi_transfer_one().
> >>
> >> How about replacing "no DMA channels available, using PIO" and have
> >> instead single info message telling is the DMA available or does the
> >> driver use PIO only?
> >
> > Ok, it's a good idea, to avoid to many similar messages.
> > So I can simply remove the:
> >
> > "no DMA channels available, using PIO"
> >
> > and leave only the new:
> >
> > " pxa2xx-spi pxa2xx-spi.13: PXA2xx SPI master controller (PIO mode)"
> >
> Yes, something like that.
> 
> Now I remember, please also take into account driver is dual role since
> commit ec93cb6f827b ("spi: pxa2xx: Add slave mode support").

Ok, right, I have to consider the slave mode, too.

Thanks Jarkko!

Flavio