TDA4VM: There is an issue about whether the timer is initialized in sdk10.0

sui guoqing

Prodigy 180 points

Part Number: TDA4VM

Tool/software:

Hi,TI

I initialized timer19 on mcu1_0, but after linux is started, timer19's TCLR register is overwritten to 0.

Is there a program to initialize the timer? Where is the program?

Thanks.

7 months ago

0 Keerthy J 7 months ago

TI__Guru**** 164670 points

Hi,

Can you confirm that before Linux runs the timer runs as expected and once Linux comes up the timer is reset?

Best Regards,

Keerthy

0 sui guoqing 6 months ago in reply to Keerthy J

Prodigy 180 points

Hi,

Yes, it can be confirmed.

If I let linux into uboot, the timer will work as well.

Best Regards.

+1 sui guoqing 6 months ago in reply to Keerthy J

Prodigy 180 points

Hi,

I also have a question, why is there no capture interrupt bit in this register.

Best Regards.

+1 Keerthy J 6 months ago in reply to sui guoqing

TI__Guru**** 164670 points

Hi,

Seems like Linux is initializing the timer19.

Below diff in Linux DTS can help avoid that:

diff --git a/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi b/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi
index 5377f462f..62abb68bf 100644
--- a/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi
@@ -1369,6 +1369,7 @@
                assigned-clock-parents = <&k3_clks 70 2>, <&k3_clks 336 1>;
                power-domains = <&k3_pds 70 TI_SCI_PD_EXCLUSIVE>;
                ti,timer-pwm;
+               status = "disabled";
        };
 
        main_uart0: serial@2800000 {

- Keerthy

Processors

Processors forum

TDA4VM: There is an issue about whether the timer is initialized in sdk10.0