Re: [PATCH] arm64: dts: imx8mp-debix-model-a: Disable EEE for 1000T

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

On Mon, Oct 27, 2025 at 11:22:35AM +0000, Russell King (Oracle) wrote:
> On Mon, Oct 27, 2025 at 09:27:49AM +0200, Laurent Pinchart wrote:
> > I've tried to diagnose the issue by adding interrupt counters to
> > dwmac4_irq_status(), counting interrupts for each bit of GMAC_INT_STATUS
> > (0x00b0). Bit RGSMIIIS (0) is the only one that seems linked to the
> > interrupts storm, increasing at around 10k per second. However, the
> > corresponding bit in GMAC_INT_EN (0x00b4) is *not* set.
> 
> I'll add to my comments earlier, because it may help you work out
> what's going on.
> 
> RGSMIIS will be set when the LNKSTS bit (bit 19) of 0xf8 changes
> state. RGSMIIS is only cleared by reading this register. So, something
> else to test would be to do a dummy read of this register and see
> whether the interrupt storm still has the RGSMIIS bit set.

It does. I then get

[   22.880935] stmmac: INTS=00000000 INTE=00001030

with the same interrupt storm. This is getting weirder and weirder.

-- 
Regards,

Laurent Pinchart