arm64: dts: allwinner: Mark timer as stopped in suspend

When possible, system firmware on 64-bit Allwinner platforms disables
OSC24M during system suspend. Since this oscillator is the clock source
for the ARM architectural timer, this causes the timer to stop counting.
Therefore, the ARM architectural timer must not be marked as NONSTOP on
these platforms, or the time will be wrong after system resume.

Adding the arm,no-tick-in-suspend property forces the kernel to ignore
the ARM architectural timer when calculating sleeptime; it falls back to
reading the RTC. Note that this only affects deep suspend, not s2idle.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20200809021822.5285-1-samuel@sholland.org

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
index 73e9b73..cf379e3 100644 (file)
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
@@ -157,6 +157,7 @@
        timer {
                compatible = "arm,armv8-timer";
                allwinner,erratum-unknown1;
+               arm,no-tick-in-suspend;
                interrupts = <GIC_PPI 13
                        (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>,
                             <GIC_PPI 14

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h5.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h5.dtsi
index 6735e31..6a7b727 100644 (file)
--- a/arch/arm64/boot/dts/allwinner/sun50i-h5.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-h5.dtsi
@@ -67,6 +67,7 @@
 
        timer {
                compatible = "arm,armv8-timer";
+               arm,no-tick-in-suspend;
                interrupts = <GIC_PPI 13
                                (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
                             <GIC_PPI 14

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
index 9ce78a7..28c77d6 100644 (file)
--- a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
@@ -90,6 +90,7 @@
 
        timer {
                compatible = "arm,armv8-timer";
+               arm,no-tick-in-suspend;
                interrupts = <GIC_PPI 13
                        (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>,
                             <GIC_PPI 14