netdev - Re: [PATCH 2/2] stmmac: intel: Honor phy LED set by system firmware on a Dell hardware

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Date:   Fri, 14 Jan 2022 14:09:06 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
        joabreu@...opsys.com, "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Marek Behún <kabel@...nel.org>,
        Ivan Bornyakov <i.bornyakov@...rotek.ru>,
        Pali Rohár <pali@...nel.org>,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] stmmac: intel: Honor phy LED set by system firmware
 on a Dell hardware

On Fri, Jan 14, 2022 at 12:07:54PM +0800, Kai-Heng Feng wrote:
> BIOS on Dell Edge Gateway 3200 already makes its own phy LED setting, so
> instead of setting another value, keep it untouched and restore the saved
> value on system resume.
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> ---
>  .../net/ethernet/stmicro/stmmac/dwmac-intel.c | 16 +++++
>  drivers/net/ethernet/stmicro/stmmac/stmmac.h  |  2 +
>  .../net/ethernet/stmicro/stmmac/stmmac_main.c |  4 ++
>  drivers/net/phy/marvell.c                     | 58 ++++++++++++-------
>  include/linux/marvell_phy.h                   |  1 +
>  5 files changed, 61 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
> index 8e8778cfbbadd..f8a2879e0264a 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
> @@ -857,6 +857,16 @@ static const struct dmi_system_id quark_pci_dmi[] = {
>  	{}
>  };
>  
> +static const struct dmi_system_id use_preset_led[] = {
> +	{
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "Dell EMC"),
> +			DMI_MATCH(DMI_PRODUCT_NAME, "Edge Gateway 3200"),
> +		},
> +	},
> +	{}
> +};

This is a PHY property. Why is the MAC involved?

Please also think about how to make this generic, so any ACPI based
system can use it, with any PHY.

     Andrew