From: E Shattow <e@freeshell.de>
To: Inochi Amaoto <inochiama@gmail.com>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>, Yixun Lan <dlan@kernel.org>,
Paul Walmsley <pjw@kernel.org>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Alexandre Ghiti <alex@ghiti.fr>
Cc: devicetree@vger.kernel.org, linux-riscv@lists.infradead.org,
spacemit@lists.linux.dev, linux-kernel@vger.kernel.org,
Yixun Lan <dlan@gentoo.org>, Longbin Li <looong.bin@gmail.com>
Subject: Re: [PATCH 1/2] riscv: dts: spacemit: Add enough deassert time for the PHY on PICO ITX
Date: Sat, 11 Jul 2026 00:19:15 -0700 [thread overview]
Message-ID: <65498313-582e-4891-9468-a38a76cb4626@freeshell.de> (raw)
In-Reply-To: <20260710063314.1030249-1-inochiama@gmail.com>
Hello Inochi,
On 7/9/26 23:33, Inochi Amaoto wrote:
> RTL8211F require at least 50ms deassert to guarantee the register
> access, 10ms is only enough for the PHY reset.
>
> Fixes: 74657a376960 ("riscv: dts: spacemit: Add ethernet device for K3")
> Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
> ---
> arch/riscv/boot/dts/spacemit/k3-pico-itx.dts | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts b/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts
> index 1eb5abbc61f9..b2a7d2d0d3a8 100644
> --- a/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts
> +++ b/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts
> @@ -200,7 +200,7 @@ phy0: phy@1 {
> reg = <1>;
> reset-gpios = <&gpio 0 15 GPIO_ACTIVE_LOW>;
> reset-assert-us = <10000>;
> - reset-deassert-us = <10000>;
> + reset-deassert-us = <50000>;
> };
> };
> };
applying this as vendor pre-installed u-boot runtime command modifying
Fdt as...
load usb 0:1 $fdt_addr_r
/debian-installer/device-tree-custom/spacemit/k3-pico-itx.dtb
load usb 0:1 $kernel_addr_r /debian-installer/riscv64/linux-custom
load usb 0:1 $ramdisk_addr_r /debian-installer/riscv64/initrd-custom.gz
fdt addr $fdt_addr_r
fdt resize
fdt rm /soc/ethernet@cac80000/mdio/phy@1 reset-deassert-us
fdt set /soc/ethernet@cac80000/mdio/phy@1 reset-deassert-us <50000>
env set bootargs 'initrd='$ramdisk_addr_r',0x'$filesize'
console=ttyS0,115200'
ping 127.0.0.1; bootefi $kernel_addr_r $fdt_addr_r
...before booting 7.2-rc2 and debian-installer initrd is successful to
allow debian-installer hardware probe to continue with the network
device, on Sipeed K3 Pico ITX. I don't know if that is a full fix for
the problem I observed with rmmod/modprobe cycle of network module but
at least it is resolving this trouble observed from debian-installer
usage with K3 Pico ITX.
Non-functional values are 10000 25000 30000 35000 39000 39750 39700
39600 39585 39581.
Functioning values are 39582 39583 39580 39575 39550 39500 40000 50000.
For this particular hardware I have thus observed an exact minimum
required delay value of 39582.
Tested-by: E Shattow <e@freeshell.de>
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prev parent reply other threads:[~2026-07-11 7:20 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-10 6:33 [PATCH 1/2] riscv: dts: spacemit: Add enough deassert time for the PHY on PICO ITX Inochi Amaoto
2026-07-10 6:33 ` [PATCH 2/2] riscv: dts: spacemit: Add enough deassert time for the PHY on com260 board Inochi Amaoto
2026-07-10 22:38 ` [PATCH 1/2] riscv: dts: spacemit: Add enough deassert time for the PHY on PICO ITX Yixun Lan
2026-07-11 7:19 ` E Shattow [this message]
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