On Tue, 20 Oct 2020 14:50:01 +0200 Andrew Lunn wrote:
> On Sun, Oct 18, 2020 at 06:36:25PM +0200, Ard Biesheuvel wrote:
> > Since commit bbc4d71d63549bc ("net: phy: realtek: fix rtl8211e rx/tx
> > delay config"), the Realtek PHY driver will override any TX/RX delay
> > set by hardware straps if the phy-mode device property does not match.
> >
> > This is causing problems on SynQuacer based platforms (the only SoC
> > that incorporates the netsec hardware), since many were built with
> > this Realtek PHY, and shipped with firmware that defines the phy-mode
> > as 'rgmii', even though the PHY is configured for TX and RX delay using
> > pull-ups.
> >
> > >From the driver's perspective, we should not make any assumptions in
> > the general case that the PHY hardware does not require any initial
> > configuration. However, the situation is slightly different for ACPI
> > boot, since it implies rich firmware with AML abstractions to handle
> > hardware details that are not exposed to the OS. So in the ACPI case,
> > it is reasonable to assume that the PHY comes up in the right mode,
> > regardless of whether the mode is set by straps, by boot time firmware
> > or by AML executed by the ACPI interpreter.
> >
> > So let's ignore the 'phy-mode' device property when probing the netsec
> > driver in ACPI mode, and hardcode the mode to PHY_INTERFACE_MODE_NA,
> > which should work with any PHY provided that it is configured by the
> > time the driver attaches to it. While at it, document that omitting
> > the mode is permitted for DT probing as well, by setting the phy-mode
> > DT property to the empty string.
> >
> > Fixes: 533dd11a12f6 ("net: socionext: Add Synquacer NetSec driver")
> > Signed-off-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
>
> Reviewed-by: Andrew Lunn <andrew@xxxxxxx>
Thanks, applied.
Just to be on the safe side please make sure to CC Rob & DT list
if your patch touches anything device tree.
> --- a/Documentation/devicetree/bindings/net/socionext-netsec.txt
> +++ b/Documentation/devicetree/bindings/net/socionext-netsec.txt
> @@ -30,7 +30,9 @@ Optional properties: (See ethernet.txt file in the same directory)
> - max-frame-size: See ethernet.txt in the same directory.
>
> The MAC address will be determined using the optional properties
> -defined in ethernet.txt.
> +defined in ethernet.txt. The 'phy-mode' property is required, but may
> +be set to the empty string if the PHY configuration is programmed by
> +the firmware or set by hardware straps, and needs to be preserved.
>
> Example:
> eth0: ethernet@522d0000 {
