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

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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
This commit is contained in:
Samuel Holland
2020-08-08 21:18:22 -05:00
committed by Maxime Ripard
parent 7db1aa6ff9
commit a371b1bdf2
3 changed files with 3 additions and 0 deletions
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1
arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
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@@ -157,6 +157,7 @@ link_codec: simple-audio-card,codec {
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

1
arch/arm64/boot/dts/allwinner/sun50i-h5.dtsi
View File

@@ -67,6 +67,7 @@ psci {
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

1
arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
View File

@@ -90,6 +90,7 @@ psci {
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