linux-kernel - Re: [PATCH] arm64: defconfig: Enable FSL

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Date:   Thu, 13 Jun 2019 08:45:10 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Li Yang <leoyang.li@....com>
Cc:     madalin.bucur@....com, Rob Herring <robh+dt@...nel.org>,
        aisheng.dong@....com, Vinod Koul <vkoul@...nel.org>,
        Grant Likely <grant.likely@....com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: defconfig: Enable FSL_EDMA driver

On Wed, Jun 12, 2019 at 03:01:29PM -0500, Li Yang wrote:
> On Thu, May 9, 2019 at 10:15 PM Shawn Guo <shawnguo@...nel.org> wrote:
> >
> > On Mon, Apr 22, 2019 at 01:30:56PM -0500, Li Yang wrote:
> > > Enables the FSL EDMA driver by default.  This also works around an issue
> > > that imx-i2c driver keeps deferring the probe because of the DMA is not
> > > ready.  And currently the DMA engine framework can not correctly tell
> > > if the DMA channels will truly become available later (it will never be
> > > available if the DMA driver is not enabled).
> > >
> > > This will cause indefinite messages like below:
> > > [    3.335829] imx-i2c 2180000.i2c: can't get pinctrl, bus recovery not supported
> > > [    3.344455] ina2xx 0-0040: power monitor ina220 (Rshunt = 1000 uOhm)
> > > [    3.350917] lm90 0-004c: 0-004c supply vcc not found, using dummy regulator
> > > [    3.362089] imx-i2c 2180000.i2c: can't get pinctrl, bus recovery not supported
> > > [    3.370741] ina2xx 0-0040: power monitor ina220 (Rshunt = 1000 uOhm)
> > > [    3.377205] lm90 0-004c: 0-004c supply vcc not found, using dummy regulator
> > > [    3.388455] imx-i2c 2180000.i2c: can't get pinctrl, bus recovery not supported
> > > .....
> > >
> > > Signed-off-by: Li Yang <leoyang.li@....com>
> >
> > Applied, thanks.
> 
> Hi Shawn,
> 
> Is it possible to move this patch to the -fix series so that it can
> reach the mainline earlier?  It is having a boot failure in mainline
> for platforms using this device without this workaround.

Why would I2C device deferring cause boot failure on a platform?  I'm
just trying to understand severity of the problem.

Shawn