netdev - Re: [PATCH v2] net: phy: marvell: add special handling of Finisar modules with 88E1111

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Date:   Tue, 20 Oct 2020 21:39:43 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Robert Hancock <robert.hancock@...ian.com>
Cc:     andrew@...n.ch, hkallweit1@...il.com, davem@...emloft.net,
        netdev@...r.kernel.org
Subject: Re: [PATCH v2] net: phy: marvell: add special handling of Finisar
 modules with 88E1111

On Tue, Oct 20, 2020 at 01:10:48PM -0600, Robert Hancock wrote:
> The Finisar FCLF8520P2BTL 1000BaseT SFP module uses a Marvel 88E1111 PHY
> with a modified PHY ID. Add support for this ID using the 88E1111
> methods.
> 
> By default these modules do not have 1000BaseX auto-negotiation enabled,
> which is not generally desirable with Linux networking drivers. Add
> handling to enable 1000BaseX auto-negotiation when these modules are
> used in 1000BaseX mode. Also, some special handling is required to ensure
> that 1000BaseT auto-negotiation is enabled properly when desired.
> 
> Based on existing handling in the AMD xgbe driver and the information in
> the Finisar FAQ:
> https://www.finisar.com/sites/default/files/resources/an-2036_1000base-t_sfp_faqreve1.pdf

Just one further point...

> 
> Signed-off-by: Robert Hancock <robert.hancock@...ian.com>
> ---
>  drivers/net/phy/marvell.c   | 99 ++++++++++++++++++++++++++++++++++++-
>  include/linux/marvell_phy.h |  3 ++
>  2 files changed, 101 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
> index 5aec673a0120..49392d15035c 100644
> --- a/drivers/net/phy/marvell.c
> +++ b/drivers/net/phy/marvell.c
> @@ -80,8 +80,11 @@
>  #define MII_M1111_HWCFG_MODE_FIBER_RGMII	0x3
>  #define MII_M1111_HWCFG_MODE_SGMII_NO_CLK	0x4
>  #define MII_M1111_HWCFG_MODE_RTBI		0x7
> +#define MII_M1111_HWCFG_MODE_COPPER_1000BX_AN	0x8

I would suggest using MII_M1111_HWCFG_MODE_COPPER_1000X_AN, as there
is a 1000BASE-BX.

>  #define MII_M1111_HWCFG_MODE_COPPER_RTBI	0x9
>  #define MII_M1111_HWCFG_MODE_COPPER_RGMII	0xb
> +#define MII_M1111_HWCFG_MODE_COPPER_1000BX_NOAN 0xc

Same here.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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