netdev - Re: [PATCH net v3 2/3] net: stmmac: check if MAC needs to attach to a PHY

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Date:   Wed, 5 Apr 2023 18:08:30 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Michael Sit Wei Hong <michael.wei.hong.sit@...el.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Ong Boon Leong <boon.leong.ong@...el.com>,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Looi Hong Aun <hong.aun.looi@...el.com>,
        Voon Weifeng <weifeng.voon@...el.com>,
        Lai Peter Jun Ann <peter.jun.ann.lai@...el.com>
Subject: Re: [PATCH net v3 2/3] net: stmmac: check if MAC needs to attach to
 a PHY

On Wed, Apr 05, 2023 at 10:02:16AM -0700, Guenter Roeck wrote:
> Hi,
> 
> On Fri, Mar 24, 2023 at 04:16:55PM +0800, Michael Sit Wei Hong wrote:
> > After the introduction of the fixed-link support, the MAC driver
> > no longer attempt to scan for a PHY to attach to. This causes the
> > non fixed-link setups to stop working.
> > 
> > Using the phylink_expects_phy() to check and determine if the MAC
> > should expect and attach a PHY.
> > 
> > Fixes: ab21cf920928 ("net: stmmac: make mdio register skips PHY scanning for fixed-link")
> > Signed-off-by: Michael Sit Wei Hong <michael.wei.hong.sit@...el.com>
> > Signed-off-by: Lai Peter Jun Ann <peter.jun.ann.lai@...el.com>
> 
> With this patch in linux-next, the orangepi-pc qemu emulation fails to
> bring up the Ethernet interface. The following error is seen.
> 
> [   12.482401] dwmac-sun8i 1c30000.ethernet eth0: Register MEM_TYPE_PAGE_POOL RxQ-0
> [   12.487789] dwmac-sun8i 1c30000.ethernet eth0: PHY [mdio_mux-0.1:01] driver [Generic PHY] (irq=POLL)
> [   12.488177] dwmac-sun8i 1c30000.ethernet eth0: no phy found
> [   12.488295] dwmac-sun8i 1c30000.ethernet eth0: __stmmac_open: Cannot attach to PHY (error: -19)
> 
> Reverting this patch fixes the problem.

Please see 20230405093945.3549491-1-michael.wei.hong.sit@...el.com
for the fix.

-- 
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