linux-kernel - Re: [REGRESSION,6.14.0-rc1]: rk_gmac-dwmac: no ethernet device shows up (NanoPi M4)

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Message-ID: <INKEBRCGF47MsjO5WHpLcf1OTcQHw2KG6_Ez-K9QiTwAnb4MRVErnxoUT1euX_o9oRrxUILDRDvlOZ7ezguCU4maUyvkk-UqU52l6xLsF8U=@montleon.com>
Date: Wed, 05 Feb 2025 04:19:58 +0000
From: Jason Montleon <jason@...tleon.com>
To: Domenico Andreoli <domenico.andreoli@...ux.com>
Cc: netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>, "hayashi.kunihiko@...ionext.com" <hayashi.kunihiko@...ionext.com>, "si.yanteng@...ux.dev" <si.yanteng@...ux.dev>, "pabeni@...hat.com" <pabeni@...hat.com>
Subject: Re: [REGRESSION,6.14.0-rc1]: rk_gmac-dwmac: no ethernet device shows up (NanoPi M4)

On Monday, February 3rd, 2025 at 5:51 AM, Domenico Andreoli <domenico.andreoli@...ux.com> wrote:

>
>
> Hi,
>
> This morning I tried 6.14.0-rc1 on my NanoPi M4, the ethernet does not
> show up.

I am experiencing similar behavior on the Lichee Pi 4A with thead-dwmac. It works fine on 6.12.12 and 6.13.1, but with 6.14-rc1 I don't see these last several lines of output as in your case. I did also see the same new error:
+stmmaceth ffe7070000.ethernet: Can't specify Rx FIFO size

It looks like this message was introduced in the following commit and if I build with it reverted my ethernet interfaces work again.

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/net/ethernet/stmicro?h=v6.14-rc1&id=8865d22656b442b8d0fb019e6acb2292b99a9c3c

Thanks,
Jason

> This is the diff of the output of `dmesg | grep rk_gmac-dwmac` on 6.13.0
> and 6.14.0-rc1:
>
> --- m4.ok.log 2025-02-03 11:37:03.991757775 +0100
> +++ m4.nok.log 2025-02-03 11:37:17.249455484 +0100
> @@ -15,4 +15,13 @@
> rk_gmac-dwmac fe300000.ethernet: COE Type 2
> rk_gmac-dwmac fe300000.ethernet: TX Checksum insertion supported
> rk_gmac-dwmac fe300000.ethernet: Wake-Up On Lan supported
> -rk_gmac-dwmac fe300000.ethernet: Normal descriptors
> -rk_gmac-dwmac fe300000.ethernet: Ring mode enabled
> -rk_gmac-dwmac fe300000.ethernet: Enable RX Mitigation via HW Watchdog Timer
> -rk_gmac-dwmac fe300000.ethernet end0: renamed from eth0
> -rk_gmac-dwmac fe300000.ethernet end0: Register MEM_TYPE_PAGE_POOL RxQ-0
> -rk_gmac-dwmac fe300000.ethernet end0: PHY [stmmac-0:01] driver [Generic PHY] (irq=POLL)
> -rk_gmac-dwmac fe300000.ethernet end0: No Safety Features support found
> -rk_gmac-dwmac fe300000.ethernet end0: PTP not supported by HW
> -rk_gmac-dwmac fe300000.ethernet end0: configuring for phy/rgmii link mode
> -rk_gmac-dwmac fe300000.ethernet end0: Link is Up - 1Gbps/Full - flow control rx/tx
> +rk_gmac-dwmac fe300000.ethernet: Can't specify Rx FIFO size
>
> The configration was updated with `make olddefconfig`, as usual. I
> could not find any new option that I might need to enable, if that is
> what went wrong.
>
> Is there anything I can do to help diagnose this?
>
> Thanks,
> Dom