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Subject: Re: [PATCH net] net: broadcom: Imply BROADCOM_PHY for BCMGENET
To:     Florian Fainelli <f.fainelli@gmail.com>, netdev@vger.kernel.org
Cc:     nsaenzjulienne@suse.de, wahrenst@gmx.net,
        "David S. Miller" <davem@davemloft.net>,
        Thomas Gleixner <tglx@linutronix.de>,
        Tal Gilboa <talgi@mellanox.com>,
        Michael Chan <michael.chan@broadcom.com>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Andy Gospodarek <gospo@broadcom.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        open list <linux-kernel@vger.kernel.org>
From:   Marek Szyprowski <m.szyprowski@samsung.com>
Message-ID: <350c88a9-eeaf-7859-d425-0ee4ca355ed3@samsung.com>
Date:   Mon, 11 May 2020 09:21:51 +0200
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Hi Florian,

On 09.05.2020 00:32, Florian Fainelli wrote:
> The GENET controller on the Raspberry Pi 4 (2711) is typically
> interfaced with an external Broadcom PHY via a RGMII electrical
> interface. To make sure that delays are properly configured at the PHY
> side, ensure that we get a chance to have the dedicated Broadcom PHY
> driver (CONFIG_BROADCOM_PHY) enabled for this to happen.
>
> Fixes: 402482a6a78e ("net: bcmgenet: Clear ID_MODE_DIS in EXT_RGMII_OOB_CTRL when not needed")
> Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
> ---
> David,
>
> I would like Marek to indicate whether he is okay or not with this
> change. Thanks!

It is better. It fixes the default values for ARM 32bit 
bcm2835_defconfig and ARM 64bit defconfig, so you can add:

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>

There is still an issue there. In case of ARM 64bit, when Genet driver 
is configured as a module, BROADCOM_PHY is also set to module. When I 
changed Genet to be built-in, BROADCOM_PHY stayed selected as module. 
This case doesn't work, as Genet driver is loaded much earlier than the 
rootfs/initrd/etc is available, thus broadcom phy driver is not loaded 
at all. It looks that some kind of deferred probe is missing there.

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland