linux-kernel - [PATCH v3 2/8] drm/rockchip: vop2: Switch impossible pos conditional to WARN

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Message-Id: <20251209-vop2-atomic-fixups-v3-2-07c48f0f1f0d@collabora.com>
Date: Tue, 09 Dec 2025 12:14:15 +0100
From: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
To: Chaoyi Chen <chaoyi.chen@...k-chips.com>, 
 Sandy Huang <hjc@...k-chips.com>, 
 Heiko Stübner <heiko@...ech.de>, 
 Andy Yan <andy.yan@...k-chips.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>
Cc: Daniel Stone <daniels@...labora.com>, dri-devel@...ts.freedesktop.org, 
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, kernel@...labora.com, 
 Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Subject: [PATCH v3 2/8] drm/rockchip: vop2: Switch impossible pos
 conditional to WARN_ON

From: Daniel Stone <daniels@...labora.com>

We already clip the plane to the display bounds in atomic_check, and
ensure that it is sufficiently sized. Instead of trying to catch this
and adjust for it in atomic_update, just assert that atomic_check has
done its job.

Signed-off-by: Daniel Stone <daniels@...labora.com>
Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
---
 drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 29 +++++++++-------------------
 1 file changed, 9 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
index 20b49209ddcd..81b3eba07095 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
@@ -1214,28 +1214,17 @@ static void vop2_plane_atomic_update(struct drm_plane *plane,
 	src_w = drm_rect_width(src) >> 16;
 	src_h = drm_rect_height(src) >> 16;
 	dsp_w = drm_rect_width(dest);
-
-	if (dest->x1 + dsp_w > adjusted_mode->hdisplay) {
-		drm_dbg_kms(vop2->drm,
-			    "vp%d %s dest->x1[%d] + dsp_w[%d] exceed mode hdisplay[%d]\n",
-			    vp->id, win->data->name, dest->x1, dsp_w, adjusted_mode->hdisplay);
-		dsp_w = adjusted_mode->hdisplay - dest->x1;
-		if (dsp_w < 4)
-			dsp_w = 4;
-		src_w = dsp_w * src_w / drm_rect_width(dest);
-	}
-
 	dsp_h = drm_rect_height(dest);
 
-	if (dest->y1 + dsp_h > adjusted_mode->vdisplay) {
-		drm_dbg_kms(vop2->drm,
-			    "vp%d %s dest->y1[%d] + dsp_h[%d] exceed mode vdisplay[%d]\n",
-			    vp->id, win->data->name, dest->y1, dsp_h, adjusted_mode->vdisplay);
-		dsp_h = adjusted_mode->vdisplay - dest->y1;
-		if (dsp_h < 4)
-			dsp_h = 4;
-		src_h = dsp_h * src_h / drm_rect_height(dest);
-	}
+	/* drm_atomic_helper_check_plane_state calls drm_rect_clip_scaled for
+	 * us, which keeps our planes bounded within the CRTC active area
+	 */
+	WARN_ON(dest->x1 + dsp_w > adjusted_mode->hdisplay);
+	WARN_ON(dest->y1 + dsp_h > adjusted_mode->vdisplay);
+	WARN_ON(dsp_w < 4);
+	WARN_ON(dsp_h < 4);
+	WARN_ON(src_w < 4);
+	WARN_ON(src_h < 4);
 
 	/*
 	 * This is workaround solution for IC design:

-- 
2.52.0