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

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Date:   Wed, 12 Jun 2019 15:01:29 -0500
From:   Li Yang <leoyang.li@....com>
To:     Shawn Guo <shawnguo@...nel.org>, madalin.bucur@....com,
        Rob Herring <robh+dt@...nel.org>, aisheng.dong@....com
Cc:     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 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.

I see Rob added a new API driver_deferred_probe_check_state() last
year.  Probably we should update the imx-i2c driver to use the new API
for optional dependencies to avoid this kind of situation completely?

Regards,
Leo