linux-kernel - Re: [PATCH net-next v2 4/8] net: usb: asix: ax88772: add phylib support

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Date:   Mon, 21 Jun 2021 08:05:49 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Russell King <linux@...linux.org.uk>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2 4/8] net: usb: asix: ax88772: add phylib
 support

Hi Oleksij,

On 18.06.2021 15:20, Oleksij Rempel wrote:
> On Fri, Jun 18, 2021 at 01:11:41PM +0200, Marek Szyprowski wrote:
>> On 18.06.2021 13:04, Heiner Kallweit wrote:
>>> On 18.06.2021 12:13, Oleksij Rempel wrote:
>>>> thank you for your feedback.
>>>>
>>>> On Fri, Jun 18, 2021 at 10:39:12AM +0200, Marek Szyprowski wrote:
>>>>> On 07.06.2021 10:27, Oleksij Rempel wrote:
>>>>>> To be able to use ax88772 with external PHYs and use advantage of
>>>>>> existing PHY drivers, we need to port at least ax88772 part of asix
>>>>>> driver to the phylib framework.
>>>>>>
>>>>>> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
>>>>> I found one more issue with this patch. On one of my test boards
>>>>> (Samsung Exynos5250 SoC based Arndale) system fails to establish network
>>>>> connection just after starting the kernel when the driver is build-in.
>>>>>
>>> If you build in the MAC driver, do you also build in the PHY driver?
>>> If the PHY driver is still a module this could explain why genphy
>>> driver is used.
>>> And your dmesg filtering suppresses the phy_attached_info() output
>>> that would tell us the truth.
>> Here is a bit more complete log:
>>
>> # dmesg | grep -i Asix
>> [    2.412966] usbcore: registered new interface driver asix
>> [    4.620094] usb 1-3.2.4: Manufacturer: ASIX Elec. Corp.
>> [    4.641797] asix 1-3.2.4:1.0 (unnamed net_device) (uninitialized):
>> invalid hw address, using random
>> [    5.657009] libphy: Asix MDIO Bus: probed
>> [    5.750584] Asix Electronics AX88772A usb-001:004:10: attached PHY
>> driver (mii_bus:phy_addr=usb-001:004:10, irq=POLL)
>> [    5.763908] asix 1-3.2.4:1.0 eth0: register 'asix' at
>> usb-12110000.usb-3.2.4, ASIX AX88772 USB 2.0 Ethernet, fe:a5:29:e2:97:3e
>> [    9.090270] asix 1-3.2.4:1.0 eth0: Link is Up - 100Mbps/Full - flow
>> control off
>>
>> This seems to be something different than missing PHY driver.
> Can you please test it:
>
> diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c
> index aec97b021a73..7897108a1a42 100644
> --- a/drivers/net/usb/asix_devices.c
> +++ b/drivers/net/usb/asix_devices.c
> @@ -453,6 +453,7 @@ static int ax88772a_hw_reset(struct usbnet *dev, int in_pm)
>   	u16 rx_ctl, phy14h, phy15h, phy16h;
>   	u8 chipcode = 0;
>   
> +	netdev_info(dev->net, "ax88772a_hw_reset\n");
>   	ret = asix_write_gpio(dev, AX_GPIO_RSE, 5, in_pm);
>   	if (ret < 0)
>   		goto out;
> @@ -509,31 +510,7 @@ static int ax88772a_hw_reset(struct usbnet *dev, int in_pm)
>   			goto out;
>   		}
>   	} else if ((chipcode & AX_CHIPCODE_MASK) == AX_AX88772A_CHIPCODE) {
> -		/* Check if the PHY registers have default settings */
> -		phy14h = asix_mdio_read_nopm(dev->net, dev->mii.phy_id,
> -					     AX88772A_PHY14H);
> -		phy15h = asix_mdio_read_nopm(dev->net, dev->mii.phy_id,
> -					     AX88772A_PHY15H);
> -		phy16h = asix_mdio_read_nopm(dev->net, dev->mii.phy_id,
> -					     AX88772A_PHY16H);
> -
> -		netdev_dbg(dev->net,
> -			   "772a_hw_reset: MR20=0x%x MR21=0x%x MR22=0x%x\n",
> -			   phy14h, phy15h, phy16h);
> -
> -		/* Restore PHY registers default setting if not */
> -		if (phy14h != AX88772A_PHY14H_DEFAULT)
> -			asix_mdio_write_nopm(dev->net, dev->mii.phy_id,
> -					     AX88772A_PHY14H,
> -					     AX88772A_PHY14H_DEFAULT);
> -		if (phy15h != AX88772A_PHY15H_DEFAULT)
> -			asix_mdio_write_nopm(dev->net, dev->mii.phy_id,
> -					     AX88772A_PHY15H,
> -					     AX88772A_PHY15H_DEFAULT);
> -		if (phy16h != AX88772A_PHY16H_DEFAULT)
> -			asix_mdio_write_nopm(dev->net, dev->mii.phy_id,
> -					     AX88772A_PHY16H,
> -					     AX88772A_PHY16H_DEFAULT);
> +		netdev_info(dev->net, "do not touch PHY regs\n");
>   	}
>   
>   	ret = asix_write_cmd(dev, AX_CMD_WRITE_IPG0,

This doesn't help for this issue.

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