Re: [PATCH v9 3/4] firmware: ti_sci: Introduce Power Management Ops

Dhruva Gole
2024-08-12T05:47:38Z

On Aug 09, 2024 at 15:53:46 +0200, Markus Schneider-Pargmann wrote:
> From: Dave Gerlach <d-gerlach@ti.com>
>
> Introduce power management ops supported by the TISCI
> Low Power Mode API [1].
>
> 1) TISCI_MSG_LPM_WAKE_REASON
> Get which wake up source woke the SoC from Low Power Mode.
> The wake up source IDs will be common for all K3 platforms.
>
> 2) TISCI_MSG_LPM_SET_DEVICE_CONSTRAINT
> Set LPM constraint on behalf of a device. By setting a constraint, the
> device ensures that it will not be powered off or reset in the selected
> mode.
>
> 3) TISCI_MSG_LPM_SET_LATENCY_CONSTRAINT
> Set LPM resume latency constraint. By setting a constraint, the host
> ensures that the resume time from selected mode will be less than the
> constraint value.
>
> [1] https://software-dl.ti.com/tisci/esd/latest/2_tisci_msgs/pm/lpm.html
>
> Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
> [g-vlaev@ti.com: LPM_WAKE_REASON and IO_ISOLATION support]
> Signed-off-by: Georgi Vlaev <g-vlaev@ti.com>
> [a-kaur@ti.com: SET_DEVICE_CONSTRAINT support]
> Signed-off-by: Akashdeep Kaur <a-kaur@ti.com>
> [vibhore@ti.com: SET_LATENCY_CONSTRAINT support]
> Signed-off-by: Vibhore Vardhan <vibhore@ti.com>
> Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
> ---
[...]
> diff --git a/drivers/firmware/ti_sci.h b/drivers/firmware/ti_sci.h
> index 8efe4d0e61fb..9dd40b6711d4 100644
> --- a/drivers/firmware/ti_sci.h
> +++ b/drivers/firmware/ti_sci.h
> @@ -38,7 +38,10 @@
>
> /* Low Power Mode Requests */
> #define TI_SCI_MSG_PREPARE_SLEEP 0x0300
> +#define TI_SCI_MSG_LPM_WAKE_REASON 0x0306
> #define TI_SCI_MSG_SET_IO_ISOLATION 0x0307
> +#define TI_SCI_MSG_LPM_SET_DEVICE_CONSTRAINT 0x0309
> +#define TI_SCI_MSG_LPM_SET_LATENCY_CONSTRAINT 0x030A
>
> /* Resource Management Requests */
> #define TI_SCI_MSG_GET_RESOURCE_RANGE 0x1500
> @@ -610,6 +613,73 @@ struct ti_sci_msg_req_set_io_isolation {
> u8 state;
> } __packed;
>
> +/**
> + * struct ti_sci_msg_resp_lpm_wake_reason - Response for TI_SCI_MSG_LPM_WAKE_REASON.
> + *
> + * @hdr: Generic header.
> + * @wake_source: The wake up source that woke soc from LPM.
> + * @wake_timestamp: Timestamp at which soc woke.
> + *
> + * Response to a generic message with message type TI_SCI_MSG_LPM_WAKE_REASON,
> + * used to query the wake up source from low power mode.
> + */
> +struct ti_sci_msg_resp_lpm_wake_reason {
> + struct ti_sci_msg_hdr hdr;
> + u32 wake_source;
> + u64 wake_timestamp;
> +} __packed;
> +

It looks like we forgot to update the parameters in this API.
See [1]:

struct tisci_msg_lpm_wake_reason_req

We're missing here the wake_pin, mode and 2 rsvd fields as well.

[1] https://software-dl.ti.com/tisci/esd/latest/2_tisci_msgs/pm/lpm.html#tisci-msg-lpm-wake-reason

--
Best regards,
Dhruva Gole <d-gole@ti.com>