linux-kernel - Re: [PATCH] ARM: tegra: Register host1x node with iommu binding on tegra124

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Message-ID: <1499784841.1520.20.camel@toradex.com>
Date:   Tue, 11 Jul 2017 14:54:04 +0000
From:   Marcel Ziswiler <marcel.ziswiler@...adex.com>
To:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "contact@...lk.fr" <contact@...lk.fr>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
CC:     "jonathanh@...dia.com" <jonathanh@...dia.com>,
        "mperttunen@...dia.com" <mperttunen@...dia.com>,
        "treding@...dia.com" <treding@...dia.com>,
        "swarren@...dia.com" <swarren@...dia.com>
Subject: Re: [PATCH] ARM: tegra: Register host1x node with iommu binding on
 tegra124

On Tue, 2017-07-11 at 11:50 +0300, Paul Kocialkowski wrote:
> On Sun, 2017-07-09 at 19:36 +0300, Paul Kocialkowski wrote:
> > This registers the host1x node with the SMMU (as HC swgroup) to
> > allow
> > the host1x code to attach to it. It avoid failing the probe
> > sequence,
> > which resulted in the tegra drm driver not probing and thus nothing
> > being displayed on-screen.
> 
> Fixes: 404bfb78daf3 ("gpu: host1x: Add IOMMU support")
> 
> > Signed-off-by: Paul Kocialkowski <contact-
> > W9ppeneeCTY@...lic.gmane.org>

Tested-by: Marcel Ziswiler <marcel.ziswiler@...adex.com>
Tested-on: Apalis TK1, Jetson-TK1

> > ---
> >  arch/arm/boot/dts/tegra124.dtsi | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/arch/arm/boot/dts/tegra124.dtsi
> > b/arch/arm/boot/dts/tegra124.dtsi
> > index 187a36c6d0fc..b3b89befffeb 100644
> > --- a/arch/arm/boot/dts/tegra124.dtsi
> > +++ b/arch/arm/boot/dts/tegra124.dtsi
> > @@ -85,6 +85,7 @@
> >  		clocks = <&tegra_car TEGRA124_CLK_HOST1X>;
> >  		resets = <&tegra_car 28>;
> >  		reset-names = "host1x";
> > +		iommus = <&mc TEGRA_SWGROUP_HC>;
> >  
> >  		#address-cells = <2>;
> >  		#size-cells = <2>;

So I take it we still will need this one moving forward, correct?

How about tegra30, I guess the same applies there, isn't it? Should I
send a patch or are you guys doing that?