From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from freeshell.de (freeshell.de [116.202.128.144]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 52B2D29D260 for ; Fri, 10 Jul 2026 14:44:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=116.202.128.144 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783694668; cv=none; b=rIc3K6yPiI5XZE/sy11jqNMR6mjkpygY8BHuIu0Tfc76NofvceQGzNYcuPOg+hmuVnzPWb92R95A+LWP9wfHQTPKvcYb3JtOoI0OVgAcP3xdDREjs/H3qpISyZxFmVdfOwY/zyh0tdRGePvMf/Mbr0nr/aL188QZrhDWEbBxCEU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783694668; c=relaxed/simple; bh=btF1p3wQZL4rW6JxCK9jYb4/9Bc6hNEQFL0xhLFTN+g=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=rjcQMaq8Gsl8pDt3atRLQpbsXXKTPp0UihFPSXkxDtCmf/Pq+XJBCwbbcMkDG89S8/kv3ucccE4gzwE4znl6JCM027H/bZQ6JL+Jz1IXqVEaAxsoN8+TvueBElzCOx+tJo0WSNiqMiuy2NYEoxpacy01vBJbbDNBQTGKJve/lmE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=freeshell.de; spf=pass smtp.mailfrom=freeshell.de; dkim=pass (2048-bit key) header.d=freeshell.de header.i=@freeshell.de header.b=lYd2+YJC; arc=none smtp.client-ip=116.202.128.144 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=freeshell.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=freeshell.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=freeshell.de header.i=@freeshell.de header.b="lYd2+YJC" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freeshell.de; s=s2025; t=1783694084; bh=86FHXPa2XXe0jpQafsCvPbpMnYcFK7y2K3Df68+mJKk=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=lYd2+YJCdkpWfiyt34fYgzav+QBwTBrGQ8g8y14C2NJaYu2FaZgoEvPxcNJVg5CQx SGaIpwkn/Nc3/2cgIpEtIp0dlEVq+ayUjQxo4LYmXeEdIR6gZDLEsupr4gOamtyuvB fwY8snMn84TiVbX7+nOzgR9SImP5eBhsXLhhVmMJbl0FY9hZV9OZaEoSwwFhapeEHV mHLk+kumdOGOwOCOF+OLGdHp/cyRNOp3dYbeCPtKzA9/Xts43s99Kbw1JEJTsQntm9 tz9cnPYuWzq3SKmrddGUIpR0L2oQuBerK3yLoMM2FxwufklZ4WJL9+FhorLhktD2rR JOs+ncGQ7qrFQ== Received: from [IPV6:2605:59ca:364f:d400:1b91:6b30:22c2:fffc] (unknown [IPv6:2605:59ca:364f:d400:1b91:6b30:22c2:fffc]) (Authenticated sender: e) by freeshell.de (Postfix) with ESMTPSA id 42B5FB221FCB; Fri, 10 Jul 2026 16:34:43 +0200 (CEST) Message-ID: <738ce6b8-798b-4689-a0f5-791fe85addbc@freeshell.de> Date: Fri, 10 Jul 2026 07:34:34 -0700 Precedence: bulk X-Mailing-List: spacemit@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] riscv: dts: spacemit: k3-pico-itx: Fix non-functional ethernet TX timing To: Yixun Lan Cc: Andrew Rembrandt , Inochi Amaoto , linux-riscv@lists.infradead.org, spacemit@lists.linux.dev, linux-kernel@vger.kernel.org References: <20260608182358.170489-1-kernel@rembrandt.dev> <77a48b81-7906-4e18-9229-48643a67f402@freeshell.de> <20260710022551-GKA106000@kernel.org> Content-Language: en-US From: E Shattow In-Reply-To: <20260710022551-GKA106000@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi Yixun, On 7/9/26 19:25, Yixun Lan wrote: > Hi E Shattow, > > On 00:29 Thu 11 Jun , E Shattow wrote: >> Hi Andrew, >> >> On 6/10/26 02:05, Andrew Rembrandt wrote: >>> On Wed, Jun 10, 2026 at 07:14:56 am Inochi Amaoto wrote: >>>> Do not do this, just leave the rx-internal-delay-ps untouched. >>> >>> Sounds good, I'll leave v1 as-is. Many thanks for the review. >>> >>> Regards, >>> >>> Andrew >>> >>> _______________________________________________ >>> linux-riscv mailing list >>> linux-riscv@lists.infradead.org >>> http://lists.infradead.org/mailman/listinfo/linux-riscv >> >> I do not notice any difference with or without this property present, >> tested Linux -next with U-Boot modification to devicetree: >> >> load usb 0:1 $fdt_addr_r /dtb/spacemit/k3-pico-itx.dtb >> fdt addr $fdt_addr_r >> fdt resize >> fdt header get filesize totalsize >> fdt set /soc/ethernet@cac80000 tx-internal-delay-ps <400> >> load usb 0:1 $kernel_addr_r /EFI/BOOT/BOOTRISCV64.EFI >> # throwaway use of ping is workaround for broken vendor U-Boot >> ping 127.0.0.1; bootefi $kernel_addr_r $fdt_addr_r >> >> Aside, there is still some problem with the driver which does cause it >> to fail. This can be reproduced by unloading the module and then loading >> the module; built from -next with 'olddefconfig' of debian Kconfig for >> kernel 7.1, no patches. >> >> # modprobe -r dwmac_spacemit >> # modprobe dwmac_spacemit >> [ 61.469745] spacemit-dwmac cac80000.ethernet end0: cannot attach to >> PHY (error: -ENODEV) >> >> [ 91.544646] spacemit-dwmac cac80000.ethernet end0: cannot attach to >> PHY (error: -ENODEV) >> > The problem is unrelated to this patch itself, but I can actually confirm here > >> If not reloading the module then I don't see any difference, traffic >> passes (ping 1.1.1.1) with or without your suggested >> tx-internal-delay-ps property. Is there a specific test to run to >> observe expected difference? >> > > Although I haven't narrowed down to the root cause, but it's kind of > something wrong with the reset procedure, remove it from phy node will fix > this issue.. > > +++ b/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts > @@ -232,9 +232,6 @@ mdio { > phy0: phy@1 { > compatible = "ethernet-phy-ieee802.3-c22"; > reg = <1>; > - reset-gpios = <&gpio 0 15 GPIO_ACTIVE_LOW>; > - reset-assert-us = <10000>; > - reset-deassert-us = <10000>; > > Yes, confirming that workaround (removing nodes as you suggested) is functional for debian-installer where that reset trouble is being observed. If there is a patch or discussion later I will follow up then, also. On the topic of this ethernet TX timing thread I don't know what this does? Is there a test situation I may try to know if it is doing anything? Thanks very much, -E