linux-kernel - [PATCH] drm/rockchip: vop2: fail cleanly if missing a primary plane for a video-port

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Message-ID: <20250610212748.1062375-1-heiko@sntech.de>
Date: Tue, 10 Jun 2025 23:27:48 +0200
From: Heiko Stuebner <heiko@...ech.de>
To: hjc@...k-chips.com,
	heiko@...ech.de,
	andy.yan@...k-chips.com
Cc: maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm/rockchip: vop2: fail cleanly if missing a primary plane for a video-port

Each window of a vop2 is usable by a specific set of video ports, so while
binding the vop2, we look through the list of available windows trying to
find one designated as primary-plane and usable by that specific port.

The code later wants to use drm_crtc_init_with_planes with that found
primary plane, but nothing has checked so far if a primary plane was
actually found.

For whatever reason, the rk3576 vp2 does not have a usable primary window
(if vp0 is also in use) which brought the issue to light and ended in a
null-pointer dereference further down.

As we expect a primary-plane to exist for a video-port, add a check at
the end of the window-iteration and fail probing if none was found.

Fixes: 604be85547ce ("drm/rockchip: Add VOP2 driver")
Signed-off-by: Heiko Stuebner <heiko@...ech.de>
---
 drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
index 7ddf311b38c6..a8dc2e55812a 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
@@ -2425,6 +2425,10 @@ static int vop2_create_crtcs(struct vop2 *vop2)
 				break;
 			}
 		}
+
+		if (!vp->primary_plane)
+			return dev_err_probe(drm->dev, -ENOENT,
+					     "no primary plane for vp %d\n", i);
 	}

 	/* Register all unused window as overlay plane */
-- 
2.47.2