linux-kernel - [PATCH] arm64: dts: mediatek: mt8186-corsola: Disable DPI display interface

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240821042836.2631815-1-wenst@chromium.org>
Date: Wed, 21 Aug 2024 12:28:34 +0800
From: Chen-Yu Tsai <wenst@...omium.org>
To: Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Chen-Yu Tsai <wenst@...omium.org>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	Stephen Boyd <swboyd@...omium.org>,
	Pin-yen Lin <treapking@...omium.org>,
	Alper Nebi Yasak <alpernebiyasak@...il.com>,
	stable@...r.kernel.org
Subject: [PATCH] arm64: dts: mediatek: mt8186-corsola: Disable DPI display interface

The DPI display interface feeds the external display pipeline. However
the pipeline representation is currently incomplete. Efforts are still
under way to come up with a way to represent the "creative" repurposing
of the DP bridge chip's internal output mux, which is meant to support
USB type-C orientation changes, to output to one of two type-C ports.

Until that is finalized, the external display can't be fully described,
and thus won't work. Even worse, the half complete graph potentially
confuses the OS, breaking the internal display as well.

Disable the external display interface across the whole Corsola family
until the DP / USB Type-C muxing graph binding is ready.

Reported-by: Alper Nebi Yasak <alpernebiyasak@...il.com>
Closes: https://lore.kernel.org/linux-mediatek/38a703a9-6efb-456a-a248-1dd3687e526d@gmail.com/
Fixes: 8855d01fb81f ("arm64: dts: mediatek: Add MT8186 Krabby platform based Tentacruel / Tentacool")
Cc: <stable@...r.kernel.org>
Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
---
Stephen has recently posted the "platform/chrome: Add DT USB/DP
muxing/topology support" patch series, which is now up to v3 [1].
More work based on this series is needed for the DP bridge drivers.

[1] https://lore.kernel.org/dri-devel/20240819223834.2049862-1-swboyd@chromium.org/
---
 arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi b/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi
index 0c4a26117428..682c6ad2574d 100644
--- a/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi
@@ -353,7 +353,8 @@ &dpi {
 	pinctrl-names = "default", "sleep";
 	pinctrl-0 = <&dpi_pins_default>;
 	pinctrl-1 = <&dpi_pins_sleep>;
-	status = "okay";
+	/* TODO Re-enable after DP to Type-C port muxing can be described */
+	status = "disabled";
 };
 
 &dpi_out {
-- 
2.46.0.184.g6999bdac58-goog