Ethernet PHY ksz8081 regression on FRDM-RW612

[DerekSnell]

Describe the bug

1fd4886 merged in #95305 from @TonyHan11 broke the Ethernet networking samples on the FRDM-RW612. The http_server and dhcpv4_client samples fail after this commit.

Regression

• This is a regression.

Steps to reproduce

west build -b frdm_rw612 samples/net/sockets/http_server/ --pristine

Relevant log output

[00:41:13.106,333] <inf> eth_nxp_enet_mac: Link is down
*** Booting Zephyr OS build v4.2.0-2858-g1fd4886ad97c ***
[00:41:13.106,853] <inf> net_config: Initializing network
[00:41:13.106,868] <inf> net_config: Waiting interface 1 (0x10042590) to be up..
[00:41:43.108,027] <inf> net_config: IPv4 address: 192.0.2.1
[00:41:43.108,207] <err> net_config: Timeout while waiting network interface
[00:41:43.108,216] <err> net_config: Network initialization failed (-115)
uart:~$

Impact

Functional Limitation – Some features not working as expected, but system usable.

Environment

No response

Additional Context

No response

[TonyHan11]

Hi @DerekSnell ,
The failure shows the network interface did not come up. According to the log the IP is got properly, this means the PHY works. 1fd4886 adds the interrupt support for ksz8081. Without this patch the PHY works in polling, even if int-gpios = <&hsgpio0 21 GPIO_ACTIVE_HIGH>; is in the device tree.
I tried to build the binary but failed with the following log. Anything else I need to do for building it successfully? Thanks a lot.

-- west build: generating a build system
Loading Zephyr default modules (Zephyr base).
-- Application: /home/user/zephyr/zephyr/samples/net/sockets/http_server
-- CMake version: 3.28.3
-- Found Python3: /home/user/tool/env_zephyr/bin/python3 (found suitable version "3.12.3", minimum required is "3.10") found components: Interpreter 
-- Cache files will be written to: /home/user/.cache/zephyr
-- Zephyr version: 4.2.99 (/home/user/zephyr/zephyr)
-- Found west (found suitable version "1.3.0", minimum required is "0.14.0")
-- Board: frdm_rw612, qualifiers: rw612
-- Found host-tools: zephyr 0.17.0 (/home/user/tool/zephyr/zephyr-sdk-0.17.0)
-- Found toolchain: zephyr 0.17.0 (/home/user/tool/zephyr/zephyr-sdk-0.17.0)
-- Found Dtc: /usr/bin/dtc (found suitable version "1.7.0", minimum required is "1.4.6") 
-- Found BOARD.dts: /home/user/zephyr/zephyr/boards/nxp/frdm_rw612/frdm_rw612.dts
-- Generated zephyr.dts: /home/user/zephyr/build_frdm_rw612/zephyr/zephyr.dts
-- Generated pickled edt: /home/user/zephyr/build_frdm_rw612/zephyr/edt.pickle
-- Generated devicetree_generated.h: /home/user/zephyr/build_frdm_rw612/zephyr/include/generated/zephyr/devicetree_generated.h

warning: MBEDTLS (defined at modules/mbedtls/Kconfig:19) has direct dependencies 0 with value n, but is currently being y-selected by the following symbols:
 - WEBSOCKET_CLIENT (defined at subsys/net/lib/websocket/Kconfig:4), with value y, direct dependencies NETWORKING (value: y), and select condition NETWORKING (value: y)

warning: MBEDTLS_CIPHER_AES_ENABLED (defined at modules/mbedtls/Kconfig.mbedtls:269) has direct dependencies MBEDTLS_BUILTIN && MBEDTLS_CFG_FILE = "config-mbedtls.h" && MBEDTLS && 0 with value n, but is currently being y-selected by the following symbols:
 - CTR_DRBG_CSPRNG_GENERATOR (defined at subsys/random/Kconfig:120), with value y, direct dependencies MBEDTLS && ENTROPY_HAS_DRIVER && <choice CSPRNG_GENERATOR_CHOICE> (value: y), and select condition MBEDTLS && ENTROPY_HAS_DRIVER && <choice CSPRNG_GENERATOR_CHOICE> (value: y)
Parsing /home/user/zephyr/zephyr/samples/net/sockets/http_server/Kconfig
Loaded configuration '/home/user/zephyr/zephyr/boards/nxp/frdm_rw612/frdm_rw612_defconfig'
Merged configuration '/home/user/zephyr/zephyr/samples/net/sockets/http_server/prj.conf'

error: Aborting due to Kconfig warnings

CMake Error at /home/user/zephyr/zephyr/cmake/modules/kconfig.cmake:387 (message):
  command failed with return code: 1
Call Stack (most recent call first):
  /home/user/zephyr/zephyr/cmake/modules/zephyr_default.cmake:131 (include)
  /home/user/zephyr/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:66 (include)
  /home/user/zephyr/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:92 (include_boilerplate)
  CMakeLists.txt:5 (find_package)


-- Configuring incomplete, errors occurred!
FATAL ERROR: command exited with status 1: /usr/bin/cmake -DWEST_PYTHON=/home/user/tool/env_zephyr/bin/python3 -B/home/user/zephyr/build_frdm_rw612 -GNinja -DBOARD=frdm_rw612 -S/home/user/zephyr/zephyr/samples/net/sockets/http_server

[jukkar]

The failure shows the network interface did not come up. According to the log the IP is got properly, this means the PHY works.

You can have a static IP address set without network interface being up. I noticed this issue Friday when trying frdm-rw612, there is something wrong in PHY.

uart:~$ net iface
Hostname: zephyr
Default interface: 1


Interface eth0 (0x10044ce0) (Ethernet) [1]
===================================
Interface is down.
uart:~$ net iface 1
Hostname: zephyr
Default interface: 1


Interface eth0 (0x10044ce0) (Ethernet) [1]
===================================
Interface is down.
Link addr : 02:04:9F:FA:60:5B
MTU       : 1500
Flags     : AUTO_START,IPv4,IPv6
Device    : ethernet (0x18032c78)
Status    : oper=DOWN, admin=UP, carrier=OFF
Ethernet capabilities supported:
        TX checksum offload
        RX checksum offload
        10 Mbits
        100 Mbits
        MAC address filtering
Ethernet PHY device: phy@2 (0x18032c54)
Failed to get link state (-5)
IPv6 not enabled for this interface.
IPv4 unicast addresses (max 1):
        <none>
IPv4 multicast addresses (max 2):
        224.0.0.1
IPv4 gateway : 0.0.0.0
uart:~$ 

I had Ethernet cable connected to a switch but that is not detected by the board and the interface stays down.

[hakehuang]

@jukkar we need implement the net harness, otherwise the CI will miss check those issue.

[hakehuang]

some findings on this.

1. the frdm_rw612/rd_rw612_bga pin mux setting seems wrong see below:

whereas the dts seting for phy is not aligned

and I do below change and only find the first time in debug mode works, and if I use a probe at R202 it works as well

--- a/boards/nxp/frdm_rw612/frdm_rw612_common.dtsi
+++ b/boards/nxp/frdm_rw612/frdm_rw612_common.dtsi
@@ -211,8 +211,8 @@
                compatible = "microchip,ksz8081";
                reg = <2>;
                status = "okay";
-               reset-gpios = <&hsgpio1 23 GPIO_ACTIVE_HIGH>;
-               int-gpios = <&hsgpio0 21 GPIO_ACTIVE_HIGH>;
+               reset-gpios = <&hsgpio0 21 GPIO_ACTIVE_HIGH>;
+               int-gpios = <&hsgpio1 23 GPIO_ACTIVE_LOW>;
                microchip,interface-type = "rmii";
        };
 };

I add the gpio and hsgpio test, which works fine
#97524

so I guess the pull down from ksz8081 is not good to trigger interrupt, and below is the screen shot for the interrupt which is very bad on this board. So short term solution is to disable the interrupt mode by remote the int-gpios, @TonyHan11, do you know how to config the strong pull down of ksz8081 int pins? and our evk design seems not follow the datasheet for int mode

all NXP boards with this PHY has the same problem, I try mimxrt1170 as well

I disable the int mode, and it works fine.

[TonyHan11]

Hi @hakehuang ,

do you know how to config the strong pull down of ksz8081 int pins?

I haven't studied the details about this yet. Just make ksz8081 interrupt mode work on the board I have.

[hakehuang]

I haven't studied the details about this yet. Just make ksz8081 interrupt mode work on the board I have.

so on your worked board, what is the setting for inpr pin external pull up?

[TonyHan11]

I haven't studied the details about this yet. Just make ksz8081 interrupt mode work on the board I have.

so on your worked board, what is the setting for inpr pin external pull up?

The setting is int-gpios = <&pioa 21 GPIO_ACTIVE_LOW>;. The GPIO is connected to KSZ8081 /INTRP(pin 18) with a 1K resistance to 3.3 voltage.