Re: [PATCH 0/4] PM: TI: AM335x: PM STANDBY fixes

[Judith Mendez <jm@ti.com>]

Hello Sukrut, Keven, Ulf,

On 3/18/25 6:00 PM, Sukrut Bellary wrote:
> This patch series fixes the Power management issues on TI's am335x soc.
> 
> on AM335x, the wakeup doesn't work in the case of STANDBY.
> 
> 1. Since CM3 PM FW [1](ti-v4.1.y) doesn't enable l4ls clockdomain upon
> wakeup, it fails to wakeup the MPU.
> To fix this, don't turn off the l4ls clk domain in the STANDBY transition
> in MPU.
> 
> 2. Also Per AM335x TRM [2](section 8.1.4.3 Power mode), in case of STANDBY,
> PER domain should be ON. So fix PER power domain handling for
> standby. l4ls is a part of the PER domain.
> 
> Since we are not turning off the l4ls clockdomain on STANDBY in MPU,
> PER power domain would remain ON. But still, explicitly handle this
> to be in sync with the STANDBY requirement.
> 
> 3. On am335x evm[1], UART0 - (UART1-HW) has a wakeup capability.
> Set the wakeup-source property in DT for AM335x.
> 
> 4. Enable PM configs for AM335x.
> 
> [1] https://git.ti.com/cgit/processor-firmware/ti-amx3-cm3-pm-firmware/
> [2] https://www.ti.com/lit/ug/spruh73q/spruh73q.pdf
> [3] https://www.ti.com/tool/TMDXEVM3358
> 
> Test log:
> https://gist.github.com/sukrutb/bdbfd1220fe8578a9decf87d0bac6796
> 

Thanks for the patches, Sukrut.

I was able to test this series on am335x EVM, baseline being rc5 next
branch: https://gist.github.com/jmenti/cda1675b5fc5844b6f065376e98026f5

Tested-by: Judith Mendez <jm@ti.com>

regards,
~ Judith