linux-kernel - Aw: Re: [PATCH] net: mtk_sgmii: implement mtk_pcs

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Date:   Thu, 20 Oct 2022 14:02:48 +0200
From:   Frank Wunderlich <frank-w@...lic-files.de>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     Frank Wunderlich <linux@...web.de>,
        linux-mediatek@...ts.infradead.org,
        Alexander Couzens <lynxis@...0.eu>,
        Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Aw: Re: [PATCH] net: mtk_sgmii: implement mtk_pcs_ops


> Gesendet: Donnerstag, 20. Oktober 2022 um 10:33 Uhr
> Von: "Russell King (Oracle)" <linux@...linux.org.uk>
> An: "Frank Wunderlich" <frank-w@...lic-files.de>
> Cc: "Frank Wunderlich" <linux@...web.de>, linux-mediatek@...ts.infradead.org, "Alexander Couzens" <lynxis@...0.eu>, "Felix Fietkau" <nbd@....name>, "John Crispin" <john@...ozen.org>, "Sean Wang" <sean.wang@...iatek.com>, "Mark Lee" <Mark-MC.Lee@...iatek.com>, "David S. Miller" <davem@...emloft.net>, "Eric Dumazet" <edumazet@...gle.com>, "Jakub Kicinski" <kuba@...nel.org>, "Paolo Abeni" <pabeni@...hat.com>, "Matthias Brugger" <matthias.bgg@...il.com>, netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
> Betreff: Re: [PATCH] net: mtk_sgmii: implement mtk_pcs_ops
>
> On Thu, Oct 20, 2022 at 07:54:49AM +0200, Frank Wunderlich wrote:
> > Am 18. Oktober 2022 18:39:01 MESZ schrieb "Russell King (Oracle)" <linux@...linux.org.uk>:
> > >Hi,
> > >
> > >A couple of points:
> > >
> > >On Tue, Oct 18, 2022 at 05:35:06PM +0200, Frank Wunderlich wrote:
> >
> > >> +	regmap_read(mpcs->regmap, SGMSYS_PCS_CONTROL_1, &val);
> > >> +	state->an_complete = !!(val & SGMII_AN_COMPLETE);
> > >> +	state->link = !!(val & SGMII_LINK_STATYS);
> > >> +	state->pause = 0;
> > >
> > >Finally, something approaching a reasonable implementation for this!
> > >Two points however:
> > >1) There's no need to set state->pause if there is no way to get that
> > >   state.
> > >2) There should also be a setting for state->pause.
> >
> > Currently it looks like pause cannot be controlled in sgmii-mode so we disabled it here to not leave it undefined. Should i drop assignment here?
>
> Why do you think it would be undefined?
>
> static void phylink_mac_pcs_get_state(struct phylink *pl,
>                                       struct phylink_link_state *state)
> {
> ...
>         if  (state->an_enabled) {
> ...
>                 state->pause = MLO_PAUSE_NONE;
>         } else {
> ,,,
>                 state->pause = pl->link_config.pause;
> 	}
> ...
>         if (pl->pcs)
>                 pl->pcs->ops->pcs_get_state(pl->pcs, state);
>
> So, phylink will call your pcs_get_state() function having initialised
> it to something sensible.

ok, then i drop the pause setting for now

regards Frank