linux-kernel - [PATCH v1 1/2] arm: rockchip: Kconfig: remove select ARM_GLOBAL

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Message-ID: <88e93a81-ef9f-adcc-db83-f8b5ba615c47@gmail.com>
Date:   Sun, 30 Oct 2022 19:36:01 +0100
From:   Johan Jonker <jbx6244@...il.com>
To:     heiko@...ech.de
Cc:     linux@...linux.org.uk, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Subject: [PATCH v1 1/2] arm: rockchip: Kconfig: remove select ARM_GLOBAL_TIMER

The clocksource and the sched_clock provided by the arm_global_timer
on Rockchip rk3066a/rk3188 are quite unstable because their rates
depend on the cpu frequency.

Recent changes to the arm_global_timer driver makes it impossible to use.

On the other side, the arm_global_timer has a higher rating than the
rockchip_timer, it will be selected by default by the time framework
while we want to use the stable rockchip clocksource.

Let's disable the arm_global_timer in order to have the ROCKCHIP_TIMER
(rk3188) or DW_APB_TIMER (rk3066a) selected by default.

Signed-off-by: Johan Jonker <jbx6244@...il.com>
---

ARM: dts: rockchip: disable arm-global-timer for rk3188
https://lore.kernel.org/linux-rockchip/1492374441-23336-26-git-send-email-daniel.lezcano@linaro.org/

clocksource: arm_global_timer: implement rate compensation whenever source clock changes
https://lore.kernel.org/all/20210406130045.15491-2-andrea.merello@gmail.com/
---
 arch/arm/mach-rockchip/Kconfig | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
index b7855cc66..0432a4430 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -15,8 +15,6 @@ config ARCH_ROCKCHIP
 	select DW_APB_TIMER_OF
 	select REGULATOR if PM
 	select ROCKCHIP_TIMER
-	select ARM_GLOBAL_TIMER
-	select CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK
 	select ZONE_DMA if ARM_LPAE
 	select PM
 	help
--
2.20.1