linux-kernel - Re: [PATCH] arm64: dts: freescale: imx8mq: Disable noc dts node

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Date:   Tue, 23 Nov 2021 17:24:31 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Martin Kepplinger <martink@...teo.de>
Cc:     Abel Vesa <abel.vesa@....com>, Rob Herring <robh@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        linux-arm-kernel@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: freescale: imx8mq: Disable noc dts node

On Tue, Nov 23, 2021 at 09:15:57AM +0000, Martin Kepplinger wrote:
> Am Dienstag, dem 23.11.2021 um 16:58 +0800 schrieb Shawn Guo:
> > On Thu, Nov 11, 2021 at 01:16:09PM +0200, Abel Vesa wrote:
> > > Adding interconnect properties to the consumer nodes creates
> > > a dependency on noc device. The imx-bus devfreq driver is not
> > > usable
> > > without the full interconnect support. The interconnect is not yet
> > > working on i.MX platforms. The devlink created on device_add makes
> > > the lcdif and other nodes that have the interconnect properties
> > > wait for the noc (imx-bus driver) to probe first.
> > > 
> > > To make sure the interconnect consumers (nodes that have
> > > interconnect
> > > properties already added) will still probe, lets disable the noc
> > > node
> > > for now. Once the interconnect on i.MX platforms is fully
> > > functional,
> > > the status of the noc node can be changed.
> > > 
> > > Fixes: ad1abc8a03fdbc05b ("arm64: dts: imx8mq: Add interconnect for
> > > lcdif")
> > 
> > Martin,
> > 
> > Do you have any comment?  So your commit added something untested?
> > 
> > Shawn
> 
> hi Shawn,
> 
> well, for imx8mq the only missing piece is the mxsfb icc bandwidth
> request. I posted a first version a year ago but that didn't make it
> in:
> https://lore.kernel.org/linux-arm-kernel/20201201103757.32165-1-martin.kepplinger@puri.sm/
> 
> So this should create a working state until the real fix in mxsfb is
> there (although I'd revert commit ad1abc8a03fd ("arm64: dts: imx8mq:
> Add interconnect for lcdif") instead).

Besides lcdif, the mipi-csi devices have interconnects property too.  Are
they already working?  If so, it makes more sense to revert ad1abc8a03fd
instead.

Shawn

> I am indeed to blame for this
> and I'm sorry I haven't yet taken the time to work on mxsfb again.
> 
> I can say I plan to do so soon, but without promise that I quickly find
> a solution that'll be merged...
> 
> If you merge this (or revert ad1abc8a03fd), I'll remember to revert
> with said update.