linux-kernel - [PATCH 2/4] Revert "drm/mediatek: dsi: Fix DSI host and panel bridge pre-enable order"

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Message-Id: <20251205-drm-seq-fix-v1-2-fda68fa1b3de@ideasonboard.com>
Date: Fri, 05 Dec 2025 11:51:49 +0200
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: 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>, 
 Andrzej Hajda <andrzej.hajda@...el.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>, 
 Dmitry Baryshkov <lumag@...nel.org>, 
 Chun-Kuang Hu <chunkuang.hu@...nel.org>, 
 Philipp Zabel <p.zabel@...gutronix.de>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Jyri Sarha <jyri.sarha@....fi>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 linux-mediatek@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
 Marek Szyprowski <m.szyprowski@...sung.com>, 
 Louis-Alexis Eyraud <louisalexis.eyraud@...labora.com>, 
 Aradhya Bhatia <aradhya.bhatia@...ux.dev>, 
 Linus Walleij <linusw@...nel.org>, Chaoyi Chen <chaoyi.chen@...k-chips.com>, 
 Vicente Bergas <vicencb@...il.com>, 
 Marek Vasut <marek.vasut+renesas@...lbox.org>, 
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>, stable@...r.kernel.org
Subject: [PATCH 2/4] Revert "drm/mediatek: dsi: Fix DSI host and panel
 bridge pre-enable order"

This reverts commit f5b1819193667bf62c3c99d3921b9429997a14b2.

As the original commit (c9b1150a68d9 ("drm/atomic-helper: Re-order
bridge chain pre-enable and post-disable")) causing the issue has been
reverted, let's revert the fix for mediatek.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: stable@...r.kernel.org # v6.17+
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 0e2bcd5f67b7..d7726091819c 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -1002,12 +1002,6 @@ static int mtk_dsi_host_attach(struct mipi_dsi_host *host,
 			return PTR_ERR(dsi->next_bridge);
 	}
 
-	/*
-	 * set flag to request the DSI host bridge be pre-enabled before device bridge
-	 * in the chain, so the DSI host is ready when the device bridge is pre-enabled
-	 */
-	dsi->next_bridge->pre_enable_prev_first = true;
-
 	drm_bridge_add(&dsi->bridge);
 
 	ret = component_add(host->dev, &mtk_dsi_component_ops);

-- 
2.43.0