linux-kernel - Re: [PATCH] arm64: tegra: p2180: Explicitly enable GPU

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Message-ID: <6q4q3xp4pbfgfgfthr52jqdugtanhybibgfvkvvajfahmbey76@zujalrprovv6>
Date: Thu, 8 May 2025 23:07:52 +0200
From: Thierry Reding <thierry.reding@...il.com>
To: webgeek1234@...il.com
Cc: Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Jonathan Hunter <jonathanh@...dia.com>, devicetree@...r.kernel.org, linux-tegra@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: tegra: p2180: Explicitly enable GPU

On Sun, Apr 20, 2025 at 05:25:17PM -0500, Aaron Kling via B4 Relay wrote:
> From: Aaron Kling <webgeek1234@...il.com>
> 
> The gpu node originally was explicitly left disabled as it was expected
> for the bootloader to enable it. However, this is only done in u-boot.
> If u-boot is not in the boot chain, this will never be enabled. Other
> Tegra210 devices already explicitly enable the gpu, so make p2180 match.
> 
> Signed-off-by: Aaron Kling <webgeek1234@...il.com>
> ---
>  arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi | 1 +
>  1 file changed, 1 insertion(+)

This is risky, because the U-Boot code was explicitly added to avoid an
issue during boot. It's probably okay to do this nowadays because all of
the boot stacks deal with this properly and as evidenced by Jetson Nano,
things still seem to work.

It may mean that users of very old L4T releases may have to update, but
they probably should do so anyway, so let's give this a go.

Thierry

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