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

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Message-ID: <5f6093e5-cf67-4516-b5b8-929987b05a2e@ti.com>
Date: Tue, 13 Aug 2024 16:51:49 +0530
From: a0230503 <a-kaur@...com>
To: Dhruva Gole <d-gole@...com>, Kevin Hilman <khilman@...libre.com>
CC: Markus Schneider-Pargmann <msp@...libre.com>, Nishanth Menon <nm@...com>,
        Tero Kristo <kristo@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Vibhore Vardhan <vibhore@...com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        Dave Gerlach <d-gerlach@...com>, Georgi Vlaev
	<g-vlaev@...com>
Subject: Re: [PATCH v9 3/4] firmware: ti_sci: Introduce Power Management Ops

On 13/08/24 09:19, Dhruva Gole wrote:
> On Aug 12, 2024 at 14:16:45 -0700, Kevin Hilman wrote:
> [...]
>>>> +/**
>>>> + * 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
>>>
>>
>> The docs mention how to interpret the pin, but not the mode.  This
>> driver should translate this mode number to some human-readable state
>> for better debug messages.
>>
>> Kevin
> 
> Agreed, we would all benefit from a logic that prints the human-readable
> state. The way to interpret the mode would be just as:
> https://software-dl.ti.com/tisci/esd/latest/2_tisci_msgs/pm/lpm.html#supported-low-power-modes
> 
> So for eg. 0x0 = TISCI_MSG_VALUE_SLEEP_MODE_DEEP_SLEEP
> 

Missing the call to ti_sci_msg_cmd_lpm_wake_reason in resume path.

Regards,
Akashdeep Kaur