linux-kernel - Re: [PATCH v1 3/3] ARM: dts: bcm2711: Enable GENET support for the RPi4

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Message-ID: <50b687c7-fc7b-cd17-7427-ea66be8edb55@gmail.com>
Date:   Tue, 15 Oct 2019 12:39:12 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Stefan Wahren <wahrenst@....net>,
        Florian Fainelli <f.fainelli@...il.com>,
        matthias.bgg@...nel.org, "David S . Miller" <davem@...emloft.net>
Cc:     Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org,
        Matthias Brugger <mbrugger@...e.com>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        linux-kernel@...r.kernel.org, Eric Anholt <eric@...olt.net>,
        Rob Herring <robh+dt@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v1 3/3] ARM: dts: bcm2711: Enable GENET support for the
 RPi4

On 10/15/19 12:35 PM, Stefan Wahren wrote:
> Hi Florian,
> 
> Am 11.10.19 um 21:31 schrieb Florian Fainelli:
>> On 10/11/19 11:48 AM, matthias.bgg@...nel.org wrote:
>>> From: Matthias Brugger <mbrugger@...e.com>
>>>
>>> Enable Gigabit Ethernet support on the Raspberry Pi 4
>>> Model B.
>>>
>>> Signed-off-by: Matthias Brugger <mbrugger@...e.com>
>>>
>>> ---
>>>
>>>  arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 22 ++++++++++++++++++++++
>>>  arch/arm/boot/dts/bcm2711.dtsi        | 18 ++++++++++++++++++
>>>  2 files changed, 40 insertions(+)
>>>
>>> diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
>>> index cccc1ccd19be..958553d62670 100644
>>> --- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
>>> +++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
>>> @@ -97,6 +97,28 @@
>>>  	status = "okay";
>>>  };
>>>
>>> +&genet {
>>> +	phy-handle = <&phy1>;
>>> +	phy-mode = "rgmii";
>> Can you check that things still work against David Miller's net-next?
>> Tree, in particular the BCM54213PE PHY might be matched by the BCM54210E
>> entry in drivers/net/phy/broadcom.c and I just fixed an issue in how
>> RGMII delays were configured:
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/?id=fea7fda7f50a6059220f83251e70709e45cc8040
>>
>> This might require you to change the 'phy-mode' property to what is
>> appropriate.
> 
> since i didn't get a reply from the Pi folks yet, i tried all the other
> rgmii variants on top of this branch [1].
> 
> But none of them worked.
> 
> In case of "rgmii-id" i'm getting:
> 
> unknown phy mode: 9
> 
> and for "rgmii-rxid":
> 
> unknown phy mode: 10
> 
> In those cases the PHY didn't even probe. Did i missed something?

Well the GENET driver can only deal with two specific RGMII modes, so
you would need something like this:

diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c
b/drivers/net/ethernet/broadcom/genet/bcmmii.c
index 970e478a9017..a12656cccf89 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
@@ -241,6 +241,8 @@ int bcmgenet_mii_config(struct net_device *dev, bool
init)
                id_mode_dis = BIT(16);
                /* fall through */
        case PHY_INTERFACE_MODE_RGMII_TXID:
+       case PHY_INTERFACE_MODE_RGMII_RXID:
+       case PHY_INTERFACE_MODE_RGMII_ID:
                if (id_mode_dis)
                        phy_name = "external RGMII (no delay)";
                else


> 
> [1] - https://github.com/lategoodbye/rpi-zero/commits/bcm2711-genet
> 


-- 
Florian