linux-kernel - Re: [PATCH 08/11] ARM: dts: DRA7xx: Add device tree entry for SGX GPU

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Message-ID: <55efd488-c6a0-4dca-baea-1fa93d13dd17@ti.com>
Date: Wed, 17 Jan 2024 09:52:41 -0600
From: Andrew Davis <afd@...com>
To: Tony Lindgren <tony@...mide.com>
CC: Frank Binns <frank.binns@...tec.com>,
        Matt Coster
	<matt.coster@...tec.com>,
        "H . Nikolaus Schaller" <hns@...delico.com>,
        Adam
 Ford <aford173@...il.com>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard
	<mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Rob Herring
	<robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Benoît Cousson
	<bcousson@...libre.com>,
        Nishanth Menon <nm@...com>, Vignesh Raghavendra
	<vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>, Paul Cercueil
	<paul@...pouillou.net>,
        <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-sunxi@...ts.linux.dev>, <linux-omap@...r.kernel.org>,
        <linux-mips@...r.kernel.org>
Subject: Re: [PATCH 08/11] ARM: dts: DRA7xx: Add device tree entry for SGX GPU

On 1/10/24 2:29 AM, Tony Lindgren wrote:
> * Andrew Davis <afd@...com> [240109 17:20]:
>> --- a/arch/arm/boot/dts/ti/omap/dra7.dtsi
>> +++ b/arch/arm/boot/dts/ti/omap/dra7.dtsi
>> @@ -850,12 +850,19 @@ target-module@...00000 {
>>   					<SYSC_IDLE_SMART>;
>>   			ti,sysc-sidle = <SYSC_IDLE_FORCE>,
>>   					<SYSC_IDLE_NO>,
>> -					<SYSC_IDLE_SMART>;
>> +					<SYSC_IDLE_SMART>,
>> +					<SYSC_IDLE_SMART_WKUP>;
> 
> You probably checked this already.. But just in case, can you please
> confirm this is intentional. The documentation lists the smart wakeup
> capability bit as reserved for dra7, maybe the documentation is wrong.
> 

It was an intentional change, although I'm not sure it is correct :)

This is how we had it in our "evil vendor tree" for years (back when it
was hwmod based), so when converting these nodes to use "ti,sysc" I noticed
this bit was set, but as you point out the documentation disagrees.

I'd rather go with what has worked before, but it doesn't seem to
break anything either way, so we could also break this change out into
its own patch if you would prefer.

Andrew

> Regards,
> 
> Tony
>