linux-kernel - [PATCH] arm64: dts: mediatek: mt8186: Move wakeup to MTU3 to get working suspend

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Message-Id: <20241106-mt8186-suspend-with-usb-wakeup-v1-1-07734a4c8236@collabora.com>
Date: Wed, 06 Nov 2024 16:01:45 -0500
From: Nícolas F. R. A. Prado <nfraprado@...labora.com>
To: 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>, 
 Allen-KH Cheng <allen-kh.cheng@...iatek.com>
Cc: kernel@...labora.com, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, Wojciech Macek <wmacek@...gle.com>, 
 Nícolas F. R. A. Prado <nfraprado@...labora.com>
Subject: [PATCH] arm64: dts: mediatek: mt8186: Move wakeup to MTU3 to get
 working suspend

The current DT has the wakeup-source and mediatek,syscon-wakeup
properties in the XHCI nodes, which configures USB wakeup after powering
down the XHCI hardware block. However, since the XHCI controller is
behind an MTU3 (USB3 DRD controller), the MTU3 only gets powered down
after USB wakeup has been configured, causing the system to detect a
wakeup, and results in broken suspend support as the system resumes
immediately.

Move the wakeup properties to the MTU3 nodes so that USB wakeup is only
enabled after the MTU3 has powered down.

With this change in place, it is possible to suspend and resume, and
also to wakeup through USB, as tested on the Google Steelix (Lenovo 300e
Yoga Chromebook Gen 4).

Fixes: f6c3e61c5486 ("arm64: dts: mediatek: mt8186: Add MTU3 nodes")
Reported-by: Wojciech Macek <wmacek@...gle.com>
Suggested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
---
 arch/arm64/boot/dts/mediatek/mt8186.dtsi | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt8186.dtsi b/arch/arm64/boot/dts/mediatek/mt8186.dtsi
index d3c3c2a40adcdf439a1c74586c35cf63a1c7cb30..b91f88ffae0e8b81b70269ea2d058b016a50232b 100644
--- a/arch/arm64/boot/dts/mediatek/mt8186.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8186.dtsi
@@ -1577,6 +1577,8 @@ ssusb0: usb@...01000 {
 			#address-cells = <2>;
 			#size-cells = <2>;
 			ranges;
+			wakeup-source;
+			mediatek,syscon-wakeup = <&pericfg 0x420 2>;
 			status = "disabled";

 			usb_host0: usb@...00000 {
@@ -1590,8 +1592,6 @@ usb_host0: usb@...00000 {
 					 <&infracfg_ao CLK_INFRA_AO_SSUSB_TOP_XHCI>;
 				clock-names = "sys_ck", "ref_ck", "mcu_ck", "dma_ck", "xhci_ck";
 				interrupts = <GIC_SPI 294 IRQ_TYPE_LEVEL_HIGH 0>;
-				mediatek,syscon-wakeup = <&pericfg 0x420 2>;
-				wakeup-source;
 				status = "disabled";
 			};
 		};
@@ -1643,6 +1643,8 @@ ssusb1: usb@...81000 {
 			#address-cells = <2>;
 			#size-cells = <2>;
 			ranges;
+			wakeup-source;
+			mediatek,syscon-wakeup = <&pericfg 0x424 2>;
 			status = "disabled";

 			usb_host1: usb@...80000 {
@@ -1656,8 +1658,6 @@ usb_host1: usb@...80000 {
 					 <&infracfg_ao CLK_INFRA_AO_SSUSB_TOP_P1_XHCI>;
 				clock-names = "sys_ck", "ref_ck", "mcu_ck", "dma_ck","xhci_ck";
 				interrupts = <GIC_SPI 324 IRQ_TYPE_LEVEL_HIGH 0>;
-				mediatek,syscon-wakeup = <&pericfg 0x424 2>;
-				wakeup-source;
 				status = "disabled";
 			};
 		};

---
base-commit: 5b913f5d7d7fe0f567dea8605f21da6eaa1735fb
change-id: 20241106-mt8186-suspend-with-usb-wakeup-a3aeea52170b

Best regards,
-- 
Nícolas F. R. A. Prado <nfraprado@...labora.com>