linux-kernel - RE: [EXT] Re: [PATCH v4 net-next 19/19] net: mvpp2: add TX FC firmware check

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Date:   Wed, 27 Jan 2021 15:23:56 +0000
From:   Stefan Chulski <stefanc@...vell.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "thomas.petazzoni@...tlin.com" <thomas.petazzoni@...tlin.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Nadav Haklai <nadavh@...vell.com>,
        Yan Markman <ymarkman@...vell.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "mw@...ihalf.com" <mw@...ihalf.com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "atenart@...nel.org" <atenart@...nel.org>
Subject: RE: [EXT] Re: [PATCH v4 net-next 19/19] net: mvpp2: add TX FC
 firmware check

> > You can devmem 0xF2400240(Device ID Status Register).
> > #define A8040_B0_DEVICE_ID      0x8045
> > #define A8040_AX_DEVICE_ID      0x8040
> > #define A7040_B0_DEVICE_ID      0x7045
> > #define A7040_AX_DEVICE_ID      0x7040
> > #define A3900_A1_DEVICE_ID      0x6025
> > #define CN9130_DEVICE_ID        0x7025
> 
> Thanks. 0x00028040, so it's AX silicon. Is there nothing that can be done for
> flow control on that?

No, we cannot support FC with AX on A8040.
 
> It would probably also be a good idea to state this requirement in the
> message as well, rather than just suggesting the firmware revision.

Ok, I would update this.

Thanks,
Stefan.