linux-kernel - [PATCH v2 2/2] arm64: dts: exynos: Correct psci compatible used on Exynos7

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

Message-Id: <20201107133926.37187-2-pawel.mikolaj.chmiel@gmail.com>
Date:   Sat,  7 Nov 2020 14:39:26 +0100
From:   Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
To:     kgene@...nel.org, krzk@...nel.org, alim.akhtar@...sung.com
Cc:     robh+dt@...nel.org, a.kesavan@...sung.com,
        naveenkrishna.ch@...il.com, thomas.ab@...sung.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
Subject: [PATCH v2 2/2] arm64: dts: exynos: Correct psci compatible used on Exynos7

It's not possible to reboot or poweroff Exynos7420 using PSCI. Instead
we need to use syscon reboot/poweroff drivers, like it's done for other
Exynos SoCs. This was confirmed by checking vendor source and testing it
on Samsung Galaxy S6 device based on this SoC.

To be able to use custom restart/poweroff handlers instead of PSCI
functions, we need to correct psci compatible. This also requires us to
provide function ids for CPU_ON and CPU_OFF.

Fixes: fb026cb65247 ("arm64: dts: Add reboot node for exynos7")
Fixes: b9024cbc937d ("arm64: dts: Add initial device tree support for exynos7")
Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
---
Changes from v1:
  - Split into two separate patches.
---
 arch/arm64/boot/dts/exynos/exynos7.dtsi | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/exynos/exynos7.dtsi b/arch/arm64/boot/dts/exynos/exynos7.dtsi
index 723f5d5fcf00..fff383206545 100644
--- a/arch/arm64/boot/dts/exynos/exynos7.dtsi
+++ b/arch/arm64/boot/dts/exynos/exynos7.dtsi
@@ -117,8 +117,10 @@ cpu_atlas3: cpu@3 {
 	};
 
 	psci {
-		compatible = "arm,psci-0.2";
+		compatible = "arm,psci";
 		method = "smc";
+		cpu_off = <0x84000002>;
+		cpu_on = <0xC4000003>;
 	};
 
 	soc: soc@0 {
-- 
2.27.0