linux-kernel - [PATCH 1/1] drm/mediatek: Add check framebuffer width and height size before config ovl

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Message-ID: <20251118022437.1284-2-xiandong.wang@mediatek.com>
Date: Tue, 18 Nov 2025 10:22:49 +0800
From: Xiandong Wang <xiandong.wang@...iatek.com>
To: Jassi Brar <jassisinghbrar@...il.com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>, Yongqiang Niu
	<yongqiang.niu@...iatek.com>
CC: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-mediatek@...ts.infradead.org>,
	<sirius.wang@...iatek.com>, <vince-wl.liu@...iatek.com>,
	<jh.hsu@...iatek.com>, <Project_Global_Chrome_Upstream_Group@...iatek.com>,
	Xiandong Wang <xiandong.wang@...iatek.com>
Subject: [PATCH 1/1] drm/mediatek: Add check framebuffer width and height size before config ovl

During the execution of the IGT test kms_cursor_edge_walk,
the screen experiences glitches and the hardware hangs.
It was discovered that the framebuffer dimensions (width and height)
provided by IGT to the display driver are zero, leading to
abnormal parameters that cause the hardware to freeze.
Therefore, it is necessary to verify the buffer dimensions
before successfully passing the IGT test.

Signed-off-by: Xiandong Wang <xiandong.wang@...iatek.com>
---
 drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
index f1fa1f1c3ff0..bb207aee91f2 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -611,7 +611,7 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx,
 	unsigned int ignore_pixel_alpha = 0;
 	unsigned int con;
 
-	if (!pending->enable) {
+	if (!pending->enable || !pending->height || !pending->width) {
 		mtk_ovl_layer_off(dev, idx, cmdq_pkt);
 		return;
 	}
-- 
2.46.0