From: Paul Kocialkowski <contact@paulk.fr>
Date: Thu, 26 Sep 2024 18:31:08 +0000 (+0200)
Subject: rockchip: rk3399-roc-pc: Hook sysreset gpio to enable full reset
X-Git-Tag: v2025.04-rc1~66^2~46
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d7882f556efb11f00fbb93ce13ef2df297b6b1c7;p=pandora-u-boot.git

rockchip: rk3399-roc-pc: Hook sysreset gpio to enable full reset

The reset mechanism used by Linux to reset the SoC is known to only
partially reset the logic. A mechanism is implemented in
rk3399_force_power_on_reset to use a GPIO connected to the PMIC's
over-temperature (OTP) reset pin, which fully resets all logic.

Hook the associated GPIO where the function expects it to enable this
reset mechanism and avoid any possible side-effect of partially-reset
units.

Without this patch, reading from the micro sd slot fails after a reset.
With this mechanism, U-Boot is able to boot from it reliably.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
---

diff --git a/arch/arm/dts/rk3399-roc-pc-u-boot.dtsi b/arch/arm/dts/rk3399-roc-pc-u-boot.dtsi
index aecf7dbe383..883d399a06a 100644
--- a/arch/arm/dts/rk3399-roc-pc-u-boot.dtsi
+++ b/arch/arm/dts/rk3399-roc-pc-u-boot.dtsi
@@ -7,6 +7,10 @@
 #include "rk3399-sdram-lpddr4-100.dtsi"
 
 / {
+	config {
+		sysreset-gpio = <&gpio1 RK_PA6 GPIO_ACTIVE_HIGH>;
+	};
+
 	vcc_hub_en: vcc_hub_en-regulator {
 		compatible = "regulator-fixed";
 		enable-active-high;
@@ -36,6 +40,10 @@
 	bootph-pre-ram;
 };
 
+&gpio1 {
+	bootph-pre-ram;
+};
+
 &spi1 {
 	flash@0 {
 		bootph-pre-ram;