OpenE2K/linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

arm64: dts: allwinner: a64: Re-add PMU node

Browse Source 
commit 6b832a1487 upstream.

As it was found recently, the Performance Monitoring Unit (PMU) on the
Allwinner A64 SoC was not generating (the right) interrupts. With the
SPI numbers from the manual the kernel did not receive any overflow
interrupts, so perf was not happy at all.
It turns out that the numbers were just off by 4, so the PMU interrupts
are from 148 to 151, not from 152 to 155 as the manual describes.

This was found by playing around with U-Boot, which typically does not
use interrupts, so the GIC is fully available for experimentation:
With *every* PPI and SPI enabled, an overflowing PMU cycle counter was
found to set a bit in one of the GICD_ISPENDR registers, with careful
counting this was determined to be number 148.

Tested with perf record and perf top on a Pine64-LTS. Also tested with
tasksetting to every core to confirm the assignment between IRQs and
cores.

This somewhat "revert-fixes" commit ed3e9406bc ("arm64: dts: allwinner:
a64: Drop PMU node").

Fixes: 34a97fcc71 ("arm64: dts: allwinner: a64: Add PMU node")
Fixes: ed3e9406bc ("arm64: dts: allwinner: a64: Drop PMU node")
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andre Przywara 2019-11-05 11:06:51 +00:00 committed by Greg Kroah-Hartman
parent 7045f88f5f
commit 51cca512d0
1 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
View File

@ -142,6 +142,15 @@
clock-output-names = "ext-osc32k"; clock-output-names = "ext-osc32k";
}; };
pmu {
compatible = "arm,cortex-a53-pmu";
interrupts = <GIC_SPI 116 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 118 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 119 IRQ_TYPE_LEVEL_HIGH>;
interrupt-affinity = <&cpu0>, <&cpu1>, <&cpu2>, <&cpu3>;
};
psci { psci {
compatible = "arm,psci-0.2"; compatible = "arm,psci-0.2";
method = "smc"; method = "smc";