Re: [PATCH net-next 10/12] net: stmmac: tc956x: add TC956x/QPS615 support

[Daniel Thompson <daniel@riscstar.com>]

On Wed, May 06, 2026 at 10:35:18PM +0800, Xilin Wu wrote:
> On 5/6/2026 10:19 PM, Andrew Lunn wrote:
> > On Wed, May 06, 2026 at 08:59:01PM +0800, Xilin Wu wrote:
> > > On 5/1/2026 11:54 PM, Alex Elder wrote:
> > > > +	/* AXI Configuration */
> > > > +	axi = &td->axi;
> > > > +	axi->axi_lpi_en = 1;
> > > > +	axi->axi_wr_osr_lmt = 31;
> > > > +	axi->axi_rd_osr_lmt = 31;
> > > > +	/* All sizes (2^2..2^8) are supported */
> > > > +	axi->axi_blen_regval = DMA_AXI_BLEN_MASK;
> > > > +	plat->axi = axi;
> > > > +
> > > > +	plat->mac_port_sel_speed = speed;
> > > > +	plat->flags = STMMAC_FLAG_MULTI_MSI_EN | STMMAC_FLAG_TSO_EN;
> > >
> > > I got WoL working only after adding STMMAC_FLAG_USE_PHY_WOL here. I guess
> > > it's required, since the driver clocks down the MAC/PMA/XPCS in its suspend
> > > hook?
> >
> > Nice to see somebody testing WoL.
> >
> > In your testing, is it the PHY doing the WoL, or the MAC? I assume
> > PHY.
> >
> > If i remember the DT correctly, the PHY interrupt is connected to a
> > SoC GPIO, not a GPIO of this chip. So for your board, it is the SoCs
> > GPIO controllers ability to perform the wake which is
> > important. However, where the PHY interrupt is connected is a board
> > design issue. Could the PHY interrupt be connected to the chip? Would
> > the chip be able to wake the system? Should STMMAC_FLAG_USE_PHY_WOL be
> > conditional?
>
> Yes, the PHY is doing the WoL. And I guess this makes sense as it allows the
> MAC to power down during suspend to save power.
>
> The INTN pin of QCA8081 is connected to the ETH_0_INT_N of QPS615. And the
> INTN_WOL pin is connected to a SoC GPIO.

Interesting. That is different to RB3gen2 where INTN is routed to both
(although there is a do-not-fit 0ohm resistor option that could change
that).

Does that mean you don't get phy interrupts reported in /proc/interrupts
before any suspend happens?


> Without this change, I can't get WoL to work. I have a working branch for
> our board here:
> https://github.com/strongtz/linux-radxa-qcom/commits/v7.0.2-8280-wip/

I took a quick look at the DT and I noticed you have an SGMII PHY
attached to both eMAC0 and eMAC1 on your board. This is something we
think should work but were unable to test. Are you able to use both
eMACs concurrently? Would be great to see that confirmed!


Daniel.