netdev - Re: [PATCH 3/3] net: dsa: ksz: Add Microchip KSZ8795 DSA driver

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Message-ID: <ea4f2da3-a91f-f1fa-b70d-e9bd46708454@denx.de>
Date:   Thu, 25 Jul 2019 16:56:37 +0200
From:   Marek Vasut <marex@...x.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, Tristram Ha <Tristram.Ha@...rochip.com>,
        "David S . Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Woojung Huh <woojung.huh@...rochip.com>
Subject: Re: [PATCH 3/3] net: dsa: ksz: Add Microchip KSZ8795 DSA driver

On 7/25/19 4:03 PM, Andrew Lunn wrote:
> On Wed, Jul 24, 2019 at 03:40:48PM +0200, Marek Vasut wrote:
>> From: Tristram Ha <Tristram.Ha@...rochip.com>
>> +static void ksz8795_phy_setup(struct ksz_device *dev, int port,
>> +			      struct phy_device *phy)
>> +{
>> +	if (port < dev->phy_port_cnt) {
>> +		/*
>> +		 * SUPPORTED_Asym_Pause and SUPPORTED_Pause can be removed to
>> +		 * disable flow control when rate limiting is used.
>> +		 */
>> +		linkmode_copy(phy->advertising, phy->supported);
>> +	}
>> +}
> 
> Hi Marek
> 
> Do you know why this is needed?

Unfortunately, no.

It seems it copies supported features of the PHY to advertised features
of the PHY for ports which are downstream (i.e. not the CPU port).