Looks like not all firmware versions used for MSM8939 program the timer
frequency for both broadcast/MMIO timers, causing a WARNING at runtime:
WARNING: CPU: 0 PID: 0 at kernel/time/clockevents.c:38 cev_delta2ns+0x74/0x90
pc : cev_delta2ns+0x74/0x90
lr : clockevents_config.part.0+0x64/0x8c
Call trace:
cev_delta2ns+0x74/0x90
clockevents_config_and_register+0x20/0x34
arch_timer_mem_of_init+0x374/0x534
timer_probe+0x88/0x110
time_init+0x14/0x4c
start_kernel+0x2c0/0x640
Unfortunately there is no way to fix the firmware on most of these
devices since it's proprietary and signed. As a workaround, specify the
clock-frequency explicitly in the DT to fix the warning.
Fixes: 61550c6c156c ("arm64: dts: qcom: Add msm8939 SoC")
Reported-by: Vincent Knecht <vincent.knecht@xxxxxxxxxx>
Signed-off-by: Stephan Gerhold <stephan@xxxxxxxxxxx>
---
arch/arm64/boot/dts/qcom/msm8939.dtsi | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/msm8939.dtsi b/arch/arm64/boot/dts/qcom/msm8939.dtsi
index 95610a32750a..4ba115eecfd5 100644
--- a/arch/arm64/boot/dts/qcom/msm8939.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8939.dtsi
@@ -2195,6 +2195,8 @@ timer@b120000 {
#address-cells = <1>;
#size-cells = <1>;
ranges;
+ /* Necessary because firmware does not configure this correctly */
+ clock-frequency = <19200000>;
frame@b121000 {
reg = <0x0b121000 0x1000>,
---
base-commit: adcad44bd1c73a5264bff525e334e2f6fc01bb9b
change-id: 20231204-msm8939-timer-c8c218aa2440
Best regards,
--
Stephan Gerhold <stephan@xxxxxxxxxxx>
