| Message ID | 1485866596-32254-6-git-send-email-al.kochet@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Am Dienstag, 31. Januar 2017, 15:43:16 CET schrieb Alexander Kochetkov: > The clocksource and the sched_clock provided by the arm_global_timer > are quite unstable because their rates depend on the cpu frequency. > > 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 > clocksource selected by default. > > Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com> depending on who is picking that up, they can add my Reviewed-by: Heiko Stuebner <heiko@sntech.de> if needed. Later on we might need to look at the rk3066 as well, as it might have the same issue.
diff --git a/arch/arm/boot/dts/rk3188.dtsi b/arch/arm/boot/dts/rk3188.dtsi index 0dc52fe..44da3d42 100644 --- a/arch/arm/boot/dts/rk3188.dtsi +++ b/arch/arm/boot/dts/rk3188.dtsi @@ -546,6 +546,7 @@ &global_timer { interrupts = <GIC_PPI 11 0xf04>; + status = "disabled"; }; &local_timer {
The clocksource and the sched_clock provided by the arm_global_timer are quite unstable because their rates depend on the cpu frequency. 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 clocksource selected by default. Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com> --- arch/arm/boot/dts/rk3188.dtsi | 1 + 1 file changed, 1 insertion(+)