netdev - Re: [RFC PATCH net-next v4 03/28] net: mdio: ipq8064: enlarge sleep after read/write operation

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Date:   Sat, 8 May 2021 08:53:58 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH net-next v4 03/28] net: mdio: ipq8064: enlarge sleep
 after read/write operation



On 5/7/2021 5:28 PM, Ansuel Smith wrote:
> With the use of the qca8k dsa driver, some problem arised related to
> port status detection. With a load on a specific port (for example a
> simple speed test), the driver starts to behave in a strange way and
> garbage data is produced. To address this, enlarge the sleep delay and
> address a bug for the reg offset 31 that require additional delay for
> this specific reg.
> 
> Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>

I am still curious whether the problem is that you have lots of traffic
going through the same bus fabric (AXI?) and that eventually puts the
register accesses to a lower priority to get through. We would most
likely need someone from QCA to tell if this is even remotely a
possibility and this is unlikely to happen.
-- 
Florian