Re: [PATCH] net: mtk_sgmii: implement mtk_pcs_ops

From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Frank Wunderlich <frank-w@public-files.de>
Cc: Frank Wunderlich <linux@fw-web.de>,
	linux-mediatek@lists.infradead.org,
	Alexander Couzens <lynxis@fe80.eu>, Felix Fietkau <nbd@nbd.name>,
	John Crispin <john@phrozen.org>,
	Sean Wang <sean.wang@mediatek.com>,
	Mark Lee <Mark-MC.Lee@mediatek.com>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] net: mtk_sgmii: implement mtk_pcs_ops
Date: Thu, 20 Oct 2022 09:33:15 +0100	[thread overview]
Message-ID: <Y1EHy0t5nXOF/3Mw@shell.armlinux.org.uk> (raw)
In-Reply-To: <949F5EE5-B22D-40E2-9783-0F75ACFE2C1F@public-files.de>

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@armlinux.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.

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