linux-kernel - [PATCH 1/2] drm: xlnx: zynqmp_kms: Init fbdev with 16 bit color

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Message-ID: <20251205123751.2257694-2-mikko.rapeli@linaro.org>
Date: Fri,  5 Dec 2025 14:37:50 +0200
From: Mikko Rapeli <mikko.rapeli@...aro.org>
To: dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Tomi Valkeinen <tomi.valkeinen@...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>,
	Anatoliy Klymenko <anatoliy.klymenko@....com>,
	stable@...r.kernel.org,
	Mikko Rapeli <mikko.rapeli@...aro.org>
Subject: [PATCH 1/2] drm: xlnx: zynqmp_kms: Init fbdev with 16 bit color

From: Anatoliy Klymenko <anatoliy.klymenko@....com>

Use RG16 buffer format for fbdev emulation. Fbdev backend is being used
by Mali 400 userspace driver which expects 16 bit RGB pixel color format.
This change should not affect console or other fbdev applications as we
still have plenty of colors left.

Cc: Bill Mills <bill.mills@...aro.org>
Cc: Ilias Apalodimas <ilias.apalodimas@...aro.org>
Cc: stable@...r.kernel.org
Signed-off-by: Anatoliy Klymenko <anatoliy.klymenko@....com>
Signed-off-by: Mikko Rapeli <mikko.rapeli@...aro.org>
---
 drivers/gpu/drm/xlnx/zynqmp_kms.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xlnx/zynqmp_kms.c b/drivers/gpu/drm/xlnx/zynqmp_kms.c
index 2bee0a2275ede..ccc35cacd10cb 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_kms.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_kms.c
@@ -525,7 +525,7 @@ int zynqmp_dpsub_drm_init(struct zynqmp_dpsub *dpsub)
 		goto err_poll_fini;
 
 	/* Initialize fbdev generic emulation. */
-	drm_client_setup_with_fourcc(drm, DRM_FORMAT_RGB888);
+	drm_client_setup_with_fourcc(drm, DRM_FORMAT_RGB565);
 
 	return 0;
 
-- 
2.34.1