From: Johan Jonker jbx6244@gmail.com
[ Upstream commit da74858a475782a3f16470907814c8cc5950ad68 ]
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@gmail.com Link: https://lore.kernel.org/r/f275ca8d-fd0a-26e5-b978-b7f3df815e0a@gmail.com Signed-off-by: Heiko Stuebner heiko@sntech.de Signed-off-by: Sasha Levin sashal@kernel.org --- 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 a837a9a34e3e..ddf23748ead4 100644 --- a/arch/arm/boot/dts/rk3188.dtsi +++ b/arch/arm/boot/dts/rk3188.dtsi @@ -630,7 +630,6 @@ &emac {
&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 859a7477909f..5edc46a5585c 100644 --- a/arch/arm/boot/dts/rk3xxx.dtsi +++ b/arch/arm/boot/dts/rk3xxx.dtsi @@ -111,6 +111,13 @@ global_timer: global-timer@1013c200 { 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 {