From: Chen-Yu Tsai <wenst@xxxxxxxxxxxx>
commit fbcc95fceb6d179dd150df2dc613dfd9b013052c upstream.
The reset line of the IT6505 bridge chip is active low, not active high.
It was incorrectly inverted in the device tree as the implementation at
the time incorrectly inverted the polarity in its driver, due to a prior
device having an inline inverting level shifter.
Fix the polarity now while the external display pipeline is incomplete,
thereby avoiding any impact to running systems.
A matching fix for the driver should be included if this change is
backported.
Fixes: 8855d01fb81f ("arm64: dts: mediatek: Add MT8186 Krabby platform based Tentacruel / Tentacool")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Chen-Yu Tsai <wenst@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20241029100226.660263-1-wenst@xxxxxxxxxxxx
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi
@@ -423,7 +423,7 @@
#sound-dai-cells = <0>;
ovdd-supply = <&mt6366_vsim2_reg>;
pwr18-supply = <&pp1800_dpbrdg_dx>;
- reset-gpios = <&pio 177 GPIO_ACTIVE_HIGH>;
+ reset-gpios = <&pio 177 GPIO_ACTIVE_LOW>;
ports {
#address-cells = <1>;
Patches currently in stable-queue which might be from wenst@xxxxxxxxxxxx are
queue-6.12/arm64-dts-mediatek-mt8186-corsola-fix-it6505-reset-line-polarity.patch
queue-6.12/arm64-dts-mediatek-mt8186-corsola-fix-gpu-supply-coupling-max-spread.patch
