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Date:   Mon, 27 Apr 2020 15:29:29 +0000
From:   Andy Duan <fugang.duan@....com>
To:     Leonard Crestez <leonard.crestez@....com>,
        Andrew Lunn <andrew@...n.ch>
CC:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Chris Healy <Chris.Healy@....aero>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH] net: ethernet: fec: Replace interrupt driven MDIO with
 polled IO

From: Leonard Crestez <leonard.crestez@....com> Sent: Monday, April 27, 2020 11:20 PM
> Hello,
> 
> This patch breaks network boot on at least imx8mm-evk. Boot works if I
> revert just commit 29ae6bd1b0d8 ("net: ethernet: fec: Replace interrupt
> driven MDIO with polled IO") on top of next-20200424.
> 
> Running with tp_printk trace_event=mdio:* shows the phy identifier is not
> read correctly:
> 
> BAD:
> [    9.058457] mdio_access: 30be0000.ethernet-1 read  phy:0x00
> reg:0x02
> val:0x0000
> [    9.065857] mdio_access: 30be0000.ethernet-1 read  phy:0x00
> reg:0x03
> val:0x0000
> 
> GOOD:
> [    9.100485] mdio_access: 30be0000.ethernet-1 read  phy:0x00
> reg:0x02
> val:0x004d
> [    9.108271] mdio_access: 30be0000.ethernet-1 read  phy:0x00
> reg:0x03
> val:0xd074
> 
> I don't have the original patch in my inbox, hope the manual In-Reply-To
> header is OK.
> 
> --
> Regards,
> Leonard

Leonard, I already sent out the revert patch to net mail list today.
Thanks for report this issue.

Regards,
Andy

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