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Message-ID: <YZ+tSMT4Z6CpOgJ3@shell.armlinux.org.uk>
Date: Thu, 25 Nov 2021 15:35:36 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Dylan Hung <dylan_hung@...eedtech.com>
Cc: linux-kernel@...r.kernel.org, linux-aspeed@...ts.ozlabs.org,
linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
andrew@...id.au, joel@....id.au, kuba@...nel.org,
davem@...emloft.net, hkallweit1@...il.com, andrew@...n.ch,
BMC-SW@...eedtech.com, stable@...r.kernel.org
Subject: Re: [PATCH v2] mdio: aspeed: Fix "Link is Down" issue
On Thu, Nov 25, 2021 at 10:44:32AM +0800, Dylan Hung wrote:
> The issue happened randomly in runtime. The message "Link is Down" is
> popped but soon it recovered to "Link is Up".
>
> The "Link is Down" results from the incorrect read data for reading the
> PHY register via MDIO bus. The correct sequence for reading the data
> shall be:
> 1. fire the command
> 2. wait for command done (this step was missing)
> 3. wait for data idle
> 4. read data from data register
>
> Fixes: f160e99462c6 ("net: phy: Add mdio-aspeed")
> Cc: stable@...r.kernel.org
> Reviewed-by: Joel Stanley <joel@....id.au>
> Signed-off-by: Dylan Hung <dylan_hung@...eedtech.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Thanks.
--
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