netdev - Re: [PATCH 09/11] ice: implement dpll interface to control cgu

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Message-ID: <ZMelDWrImeIFv+jh@nanopsycho>
Date: Mon, 31 Jul 2023 14:11:57 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Jakub Kicinski <kuba@...nel.org>
Cc: "Kubalewski, Arkadiusz" <arkadiusz.kubalewski@...el.com>,
	Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
	Jonathan Lemon <jonathan.lemon@...il.com>,
	Paolo Abeni <pabeni@...hat.com>,
	"Olech, Milena" <milena.olech@...el.com>,
	"Michalik, Michal" <michal.michalik@...el.com>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	poros <poros@...hat.com>, mschmidt <mschmidt@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
	Bart Van Assche <bvanassche@....org>
Subject: Re: [PATCH 09/11] ice: implement dpll interface to control cgu

Wed, Jul 26, 2023 at 12:49:58AM CEST, kuba@...nel.org wrote:
>On Fri, 21 Jul 2023 14:02:08 +0200 Jiri Pirko wrote:
>> So it is not a mode! Mode is either "automatic" or "manual". Then we
>> have a state to indicate the state of the state machine (unlocked, locked,
>> holdover, holdover-acq). So what you seek is a way for the user to
>> expliticly set the state to "unlocked" and reset of the state machine.
>
>+1 for mixing the state machine and config.
>Maybe a compromise would be to rename the config mode?
>Detached? Standalone?

But even with different name, you will still have the same mixture.

Why having automatic/manual mode with possibility to connect/disconnect
pins with additional uapi extension to submit state reset command is
not enough? Clear and simple, easy to document and understand.

There are too many uncertanties about "freerun" mode, very confusing,
not clear behaviour (as this thread demonstrated). That is extually very
good reason to don't have it. Could we please drop it?


>
>> Please don't mix config and state. I think we untangled this in the past
>> :/
>> 
>> Perhaps you just need an extra cmd like DPLL_CMD_DEVICE_STATE_RESET cmd
>> to hit this button.