linux-kernel - Re: [PATCH] drm: xlnx: zynqmp_dp: Support DRM_FORMAT

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Message-ID: <a8f0de1d-07e8-4e48-8495-9cafa0febcf5@linux.dev>
Date: Tue, 4 Nov 2025 16:53:48 -0500
From: Sean Anderson <sean.anderson@...ux.dev>
To: Mike Looijmans <mike.looijmans@...ic.nl>, dri-devel@...ts.freedesktop.org
Cc: David Airlie <airlied@...il.com>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Michal Simek <michal.simek@....com>,
 Simona Vetter <simona@...ll.ch>, Thomas Zimmermann <tzimmermann@...e.de>,
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: xlnx: zynqmp_dp: Support DRM_FORMAT_XRGB8888

On 6/27/25 10:50, Mike Looijmans wrote:
> XRGB8888 is the default mode that Xorg will want to use. Add support
> for this to the Zynqmp DisplayPort driver, so that applications can use
> 32-bit framebuffers. This solves that the X server would fail to start
> unless one provided an xorg.conf that sets DefaultDepth to 16.
> 
> Signed-off-by: Mike Looijmans <mike.looijmans@...ic.nl>
> ---
> 
>  drivers/gpu/drm/xlnx/zynqmp_disp.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/xlnx/zynqmp_disp.c b/drivers/gpu/drm/xlnx/zynqmp_disp.c
> index 80d1e499a18d..501428437000 100644
> --- a/drivers/gpu/drm/xlnx/zynqmp_disp.c
> +++ b/drivers/gpu/drm/xlnx/zynqmp_disp.c
> @@ -312,6 +312,11 @@ static const struct zynqmp_disp_format avbuf_gfx_fmts[] = {
>  		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_RGBA8888,
>  		.swap		= true,
>  		.sf		= scaling_factors_888,
> +	}, {
> +		.drm_fmt	= DRM_FORMAT_XRGB8888,
> +		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_RGBA8888,
> +		.swap		= true,
> +		.sf		= scaling_factors_888,
>  	}, {
>  		.drm_fmt	= DRM_FORMAT_RGBA8888,
>  		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_ABGR8888,

Tested-by: Sean Anderson <sean.anderson@...ux.dev>

I can confirm that this provides a nice performance boost :)