The clock source 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 clock source. Keep the arm_global_timer disabled in order to have the DW_APB_TIMER (rk3066a) or ROCKCHIP_TIMER (rk3188) selected by default. Signed-off-by: Johan Jonker <jbx6244@xxxxxxxxx> --- ARM: dts: rockchip: disable arm-global-timer for rk3188 https://lore.kernel.org/linux-rockchip/1492374441-23336-26-git-send-email-daniel.lezcano@xxxxxxxxxx/ clocksource: arm_global_timer: implement rate compensation whenever source clock changes https://lore.kernel.org/all/20210406130045.15491-2-andrea.merello@xxxxxxxxx/ --- arch/arm/boot/dts/rk3188.dtsi | 1 - arch/arm/boot/dts/rk3xxx.dtsi | 7 +++++++ 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/arm/boot/dts/rk3188.dtsi b/arch/arm/boot/dts/rk3188.dtsi index cdd4a0bd5..486a96ce2 100644 --- a/arch/arm/boot/dts/rk3188.dtsi +++ b/arch/arm/boot/dts/rk3188.dtsi @@ -607,7 +607,6 @@ &global_timer { interrupts = <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_EDGE_RISING)>; - status = "disabled"; }; &local_timer { diff --git a/arch/arm/boot/dts/rk3xxx.dtsi b/arch/arm/boot/dts/rk3xxx.dtsi index bf285091a..b0ec459ff 100644 --- a/arch/arm/boot/dts/rk3xxx.dtsi +++ b/arch/arm/boot/dts/rk3xxx.dtsi @@ -76,6 +76,13 @@ reg = <0x1013c200 0x20>; interrupts = <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_EDGE_RISING)>; clocks = <&cru CORE_PERI>; + status = "disabled"; + /* The clock source 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. + * Keep the arm_global_timer disabled in order to have the + * DW_APB_TIMER (rk3066a) or ROCKCHIP_TIMER (rk3188) selected by default. + */ }; local_timer: local-timer@1013c600 { -- 2.20.1
