From patchwork Fri Dec 15 20:40:45 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cristian Ciocaltea X-Patchwork-Id: 755277 Received: from madrid.collaboradmins.com (madrid.collaboradmins.com [46.235.227.194]) (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 5E80F51C36; Fri, 15 Dec 2023 20:41:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=collabora.com header.i=@collabora.com header.b="bZ9Ukbpb" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1702672858; bh=oakIDQ7uvG01/XJJI13ENXnsSIMGPigmTQIvEoHHsm0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bZ9UkbpbtR7o4Yt0JpJNHHDMRvnNvXDFgZ2qbAPQBHpA2QY8Z980Rj3yQZK8k+B1O HyXAxcuixX1hPBHvFaVCqsNQxhGr2wniiRhlnchbp7Kl98IIf5zte7bhluKSfp28+Z D8/YBkkxn/3XIuZ5J3UUAdvkq3N9z/L9tLLzCXx6CaAV34xSvCZJWuxX8w18/598t0 1XYeu1fq2VZ+BIatXZ1JMJie9kGGRd3RL6CUw8mrHlp8jZt6p+tZDjXWhfEtS0kF/G OkLT07XORsagSNfC4j4/Hv09c7WqTkSZGXja6S6F3dFhLGCHsbkkwSQhiV60Ox/QQj XrxsbqQFZhAmw== Received: from localhost (cola.collaboradmins.com [195.201.22.229]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: cristicc) by madrid.collaboradmins.com (Postfix) with ESMTPSA id 804563781FF2; Fri, 15 Dec 2023 20:40:58 +0000 (UTC) From: Cristian Ciocaltea To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Emil Renner Berthing , Samin Guo , Paul Walmsley , Palmer Dabbelt , Albert Ou , Hal Feng , Michael Turquette , Stephen Boyd , Alexandre Torgue , Jose Abreu , Maxime Coquelin , Richard Cochran , Giuseppe Cavallaro Cc: netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, linux-clk@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, kernel@collabora.com, Emil Renner Berthing Subject: [PATCH v3 6/9] riscv: dts: starfive: visionfive-v1: Setup ethernet phy Date: Fri, 15 Dec 2023 22:40:45 +0200 Message-ID: <20231215204050.2296404-7-cristian.ciocaltea@collabora.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231215204050.2296404-1-cristian.ciocaltea@collabora.com> References: <20231215204050.2296404-1-cristian.ciocaltea@collabora.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The StarFive VisionFive V1 SBC uses a Motorcomm YT8521 PHY supporting RGMII-ID, but requires manual adjustment of the RX internal delay to work properly. The default RX delay provided by the driver is 1.95 ns, which proves to be too high. Applying a 50% reduction seems to mitigate the issue. Also note this adjustment is not necessary on BeagleV Starlight SBC, which uses a Microchip PHY. Hence, there is no indication of a miss-behaviour on the GMAC side, but most likely the issue stems from the Motorcomm PHY. Co-developed-by: Emil Renner Berthing Signed-off-by: Emil Renner Berthing Signed-off-by: Cristian Ciocaltea --- .../boot/dts/starfive/jh7100-starfive-visionfive-v1.dts | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/riscv/boot/dts/starfive/jh7100-starfive-visionfive-v1.dts b/arch/riscv/boot/dts/starfive/jh7100-starfive-visionfive-v1.dts index e82af72f1aaf..ca134b9f11bf 100644 --- a/arch/riscv/boot/dts/starfive/jh7100-starfive-visionfive-v1.dts +++ b/arch/riscv/boot/dts/starfive/jh7100-starfive-visionfive-v1.dts @@ -18,3 +18,10 @@ gpio-restart { priority = <224>; }; }; + +&mdio { + phy: ethernet-phy@0 { + reg = <0>; + rx-internal-delay-ps = <900>; + }; +};