linux-kernel - Aw: Re: [PATCH v2] net: mtk_sgmii: implement mtk_pcs

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Date:   Fri, 21 Oct 2022 19:47:47 +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 v2] net: mtk_sgmii: implement mtk_pcs_ops

> Gesendet: Freitag, 21. Oktober 2022 um 11:06 Uhr
> Von: "Russell King (Oracle)" <linux@...linux.org.uk>
> An: "Frank Wunderlich" <frank-w@...lic-files.de>
> On Fri, Oct 21, 2022 at 08:04:51AM +0200, Frank Wunderlich wrote:
> > I have no register documentation to check if there is any way to read out pause/duplex setting. Maybe MTK can answer this or extend function later.
>
> I suspect we can probably guess.
>
> Looking at SGMSYS_PCS_CONTROL_1, this is actually the standard BMCR in
> the low 16 bits, and BMSR in the upper 16 bits, so:
>
> At address 4, I'd expect the PHYSID.
> At address 8, I'd expect the advertisement register in the low 16 bits
> and the link partner advertisement in the upper 16 bits.
>
> Can you try an experiment, and in mtk_sgmii_init() try accessing the
> regmap at address 0, 4, and 8 and print their contents please?

is this what you want to see?

 int mtk_sgmii_init(struct mtk_sgmii *ss, struct device_node *r, u32 ana_rgc3)
 {
        struct device_node *np;
+       unsigned int val;
        int i;

        for (i = 0; i < MTK_MAX_DEVS; i++) {
@@ -158,6 +159,12 @@ int mtk_sgmii_init(struct mtk_sgmii *ss, struct device_node *r, u32 ana_rgc3)
                if (IS_ERR(ss->pcs[i].regmap))
                        return PTR_ERR(ss->pcs[i].regmap);

+               regmap_read(ss->pcs[i].regmap, SGMSYS_PCS_CONTROL_1, &val);
+               printk(KERN_ALERT "dev: %d offset:0 0x%x",i,val);
+               regmap_read(ss->pcs[i].regmap, SGMSYS_PCS_CONTROL_1+4, &val);
+               printk(KERN_ALERT "dev: %d offset:4 0x%x",i,val);
+               regmap_read(ss->pcs[i].regmap, SGMSYS_PCS_CONTROL_1+8, &val);
+               printk(KERN_ALERT "dev: %d offset:8 0x%x",i,val);
                ss->pcs[i].pcs.ops = &mtk_pcs_ops;
        }


[    1.083359] dev: 0 offset:0 0x840140
[    1.083376] dev: 0 offset:4 0x4d544950
[    1.086955] dev: 0 offset:8 0x1
[    1.090697] dev: 1 offset:0 0x81140
[    1.093866] dev: 1 offset:4 0x4d544950
[    1.097342] dev: 1 offset:8 0x1

> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
>

regards Frank