linux-kernel - Re: [PATCH 0/2] drm: xlnx: zynqmp_kms: 16 bpp fixes for Xorg startup on AMD KV260

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Message-ID: <aUVFUx55XTjb_2nO@nuoska>
Date: Fri, 19 Dec 2025 14:30:11 +0200
From: Mikko Rapeli <mikko.rapeli@...aro.org>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: dri-devel@...ts.freedesktop.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Michal Simek <michal.simek@....com>,
	Bill Mills <bill.mills@...aro.org>,
	Ilias Apalodimas <ilias.apalodimas@...aro.org>
Subject: Re: [PATCH 0/2] drm: xlnx: zynqmp_kms: 16 bpp fixes for Xorg startup
 on AMD KV260

Hi,

On Fri, Dec 19, 2025 at 01:59:14PM +0200, Tomi Valkeinen wrote:
> Hi Mikko,
> 
> On 05/12/2025 14:37, Mikko Rapeli wrote:
> > Hi,
> > 
> > Currently on default yocto images Xorg fails to start on AMD KV260
> > because 24/32 color depth gets detected but does not actually work.
> > 
> > These two patches fix the issue and now 16 bpp gets detected
> > and Xorg starts and draws on external HDMI display using
> > kernel.org based linux-yocto kernel.
> > 
> > Anatoliy Klymenko (1):
> >   drm: xlnx: zynqmp_kms: Init fbdev with 16 bit color
> > 
> > Mikko Rapeli (1):
> >   drm: xlnx: zynqmp_kms: set preferred_depth to 16 bpp
> > 
> >  drivers/gpu/drm/xlnx/zynqmp_kms.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> 
> Did you notice the few already sent serieses on the list where the topic
> has been discussed?

> [PATCH] drm: xlnx: zynqmp_dp: Support DRM_FORMAT_XRGB8888
> [PATCH 0/3] drm: zynqmp: Make the video plane primary

Oh I wasn't aware of these.

> Or is there something else on KV260 that messes up the 24 bit color?

These look very similar and likely fix the X11 startup. I will give them
a try.

Cheers,

-Mikko