linux-kernel - RE: [PATCH 2/2] net-next: stmmac: add mdio clause 45 access from mac device for dwmac4

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Message-ID: <78EB27739596EE489E55E81C33FEC33A0B46E586@DE02WEMBXB.internal.synopsys.com>
Date:   Mon, 29 Apr 2019 15:03:59 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Biao Huang <biao.huang@...iatek.com>,
        "davem@...emloft.net" <davem@...emloft.net>
CC:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "yt.shen@...iatek.com" <yt.shen@...iatek.com>,
        "jianguo.zhang@...iatek.com" <jianguo.zhang@...iatek.com>
Subject: RE: [PATCH 2/2] net-next: stmmac: add mdio clause 45 access from
 mac device for dwmac4

From: Biao Huang <biao.huang@...iatek.com>
Date: Mon, Apr 29, 2019 at 07:35:24

> +		value |= priv->hw->mii.cl45_en;

This tells the MAC that a C45 Capable PHY is connected so it should be 
written before anything else. Maybe that explains the need for the 
mdelay() that you have in the code ?

Thanks,
Jose Miguel Abreu