linux-kernel - RE: [PATCH] drm: imx: ipuv3-plane: fix HDMI cannot work for odd screen resolutions

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID:
 <PH0PR22MB388465D1C753EA4FB57AB58CE19C2@PH0PR22MB3884.namprd22.prod.outlook.com>
Date: Wed, 4 Sep 2024 07:44:33 +0000
From: "Pu, Hui" <Hui.Pu@...ealthcare.com>
To: Liu Ying <victor.liu@....com>, "p.zabel@...gutronix.de"
	<p.zabel@...gutronix.de>, Maarten Lankhorst
	<maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>, Shawn Guo <shawnguo@...nel.org>, Sascha
 Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team
	<kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>, Sasha Levin
	<sashal@...nel.org>, Lucas Stach <l.stach@...gutronix.de>
CC: "Wang, Huan Kitty" <HuanWang@...ealthcare.com>, "Wang, Tao1"
	<taowang@...ealthcare.com>, "sebastian.reichel@...labora.com"
	<sebastian.reichel@...labora.com>, "Ray, Ian" <ian.ray@...ealthcare.com>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] drm: imx: ipuv3-plane: fix HDMI cannot work for odd
 screen resolutions

Hi Liu Ying,

Thank you very much for guiding me with so detailed comments.

V2 is coming.


> Hi Paul,
> 
> Thanks for your patch.
> 
> On 09/04/2024, Paul Pu wrote:
> > This changes the judgement of if needing to round up the width or not,
> > from using the `dp_flow` to the plane's type.
> >
> > The `dp_flow` can be -22(-EINVAL) even the plane is a PRIMARY one.
> 
> s/even/even if/

Yep, looks better.

> 
> > See `client_reg[]` in `ipu-common.c`.
> >
> > [    0.605141] [drm:ipu_plane_init] channel 28, dp flow -22,
> possible_crtcs=0x0
> >
> > Per the commit message in commit: 71f9fd5bcf09, using the plane type for
> 
> Commit 71f9fd5bcf09 is a commit that only exists in downstream kernel.
> 
> > judging if rounding up is needed is correct.
> >
> > Fixes: 71f9fd5bcf09 ("drm/imx: ipuv3-plane: Fix overlay plane width")
> 
> Commit 4333472f8d7b is the one to fix in upstream kernel.
> 
> s/71f9fd5bcf09/4333472f8d7b/

OK, thanks for finding the commit for me.

> 
> > Cc: stable@...r.kernel.org
> 
> Better to mark the versions for backporting the fix.
> Cc: stable@...r.kernel.org # 6.3+

Ah, yes, I see.

> No blank line between tags.

OK.

> > Signed-off-by: Paul Pu <hui.pu@...ealthcare.com>
> > ---
> >  drivers/gpu/drm/imx/ipuv3/ipuv3-plane.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Maybe, the patch subject can be something like:
> drm/imx/ipuv3: ipuv3-plane: Round up plane width for
> IPUV3_CHANNEL_MEM_DC_SYNC
> 
> You may find example patch subject prefixes by looking at previous commits
> which touch the same file, like
> commit 71e3657cb126 ("drm/imx/ipuv3: ipuv3-plane: reuse local variable
> height
> in atomic_update")
> 
> You may specify those fixed odd screen resolutions of your "HDMI" case in
> commit
> message.

Looks explaining better. Will do.

> 
> >
> > diff --git a/drivers/gpu/drm/imx/ipuv3/ipuv3-plane.c
> b/drivers/gpu/drm/imx/ipuv3/ipuv3-plane.c
> > index 704c549750f9..cee83ac70ada 100644
> > --- a/drivers/gpu/drm/imx/ipuv3/ipuv3-plane.c
> > +++ b/drivers/gpu/drm/imx/ipuv3/ipuv3-plane.c
> > @@ -614,7 +614,7 @@ static void ipu_plane_atomic_update(struct
> drm_plane *plane,
> >               break;
> >       }
> >
> > -     if (ipu_plane->dp_flow == IPU_DP_FLOW_SYNC_BG)
> > +     if (ipu_plane->base.type == DRM_PLANE_TYPE_PRIMARY)
> 
> plane->type is more readable.

Nice catch.

> 
> >               width = ipu_src_rect_width(new_state);
> >       else
> >               width = drm_rect_width(&new_state->src) >> 16;
> >
> > base-commit: 431c1646e1f86b949fa3685efc50b660a364c2b6
> 
> --
> Regards,
> Liu Ying