linux-kernel - Re: [RFC PATCH 0/3] gpu: nova-core: add basic timer subdevice implementation

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Message-ID: <d9c7e8ff4b32f06650b2ad4e3b993d217b286aa9.camel@nvidia.com>
Date: Fri, 28 Feb 2025 01:49:30 +0000
From: Timur Tabi <ttabi@...dia.com>
To: Alexandre Courbot <acourbot@...dia.com>, "airlied@...il.com"
	<airlied@...il.com>
CC: "nouveau-bounces@...ts.freedesktop.org"
	<nouveau-bounces@...ts.freedesktop.org>, John Hubbard <jhubbard@...dia.com>,
	"gary@...yguo.net" <gary@...yguo.net>, "rust-for-linux@...r.kernel.org"
	<rust-for-linux@...r.kernel.org>, "dri-devel@...ts.freedesktop.org"
	<dri-devel@...ts.freedesktop.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "boqun.feng@...il.com"
	<boqun.feng@...il.com>, "dakr@...nel.org" <dakr@...nel.org>,
	"nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
	"joel@...lfernandes.org" <joel@...lfernandes.org>, Ben Skeggs
	<bskeggs@...dia.com>
Subject: Re: [RFC PATCH 0/3] gpu: nova-core: add basic timer subdevice
 implementation

On Fri, 2025-02-28 at 07:37 +1000, Dave Airlie wrote:
> I've tried to retrofit checking 0xffffffff to drivers a lot, I'd
> prefer not to. Drivers getting stuck in wait for clear bits for ever.

That's what read_poll_timeout() is for.  I'm surprised Nouveau doesn't use it.