linux-kernel - Re: [Nouveau] [PATCH] drm/nouveau/kms/nv50-: Check plane size for cursors, not fb size

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Message-ID: <e26fac2f5750f4bd606cdbf9def82a3ee31db71c.camel@redhat.com>
Date:   Thu, 18 Mar 2021 18:39:16 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     Ilia Mirkin <imirkin@...m.mit.edu>
Cc:     nouveau <nouveau@...ts.freedesktop.org>,
        David Airlie <airlied@...ux.ie>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS" 
        <dri-devel@...ts.freedesktop.org>, Ben Skeggs <bskeggs@...hat.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Martin Peres <martin.peres@...uf.org>
Subject: Re: [Nouveau] [PATCH] drm/nouveau/kms/nv50-: Check plane size for
 cursors, not fb size

On Thu, 2021-03-18 at 18:13 -0400, Ilia Mirkin wrote:
> On Thu, Mar 18, 2021 at 5:56 PM Lyude Paul <lyude@...hat.com> wrote:
> > 
> > Found this while trying to make some changes to the kms_cursor_crc test.
> > curs507a_acquire checks that the width and height of the cursor framebuffer
> > are equal (asyw->image.{w,h}). This is actually wrong though, as we only
> > want to be concerned that the actual width/height of the plane are the
> > same. It's fine if we scan out from an fb that's slightly larger than the
> > cursor plane (in fact, some igt tests actually do this).
> 
> How so? The scanout engine expects the data to be packed. Height can
> be larger, but width has to match.

Huh - wasn't expecting that, nice catch. I'll fix this up in a moment

> 
>   -ilia
> 

-- 
Sincerely,
   Lyude Paul (she/her)
   Software Engineer at Red Hat
   
Note: I deal with a lot of emails and have a lot of bugs on my plate. If you've
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