From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2CA3EC0219B for ; Mon, 10 Feb 2025 03:11:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:CC:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=pyxopfq01qIFG3pHou1VqDKtq+2Cvr5wueyIRGqt7Nw=; b=0B1yjVL68GaKLN5yH7AHT0lqR+ z9whsfHWZNjYI2wG/l8HniA5Gp/0ymmUsC8gunz5nkyhjbCrsOUE044DhgGgZEt0lW7pojsS7OCFT WKsHBd0um/wWHseJs2rPGFA7fMa+S+svIvNKBo4e1Puol5MUDiZK2VeBWCkEoRtNv/XMj+fnT6BSL bWUFvk2bc3RdDPvoHs8pS2rQu3DtYDVY28n/f79+Xh+dbrmo/e9QB1QfkgqMEAmTUgyOX7UOJwKpJ vB+GfJ1KhDLd5R1qT9xrfYyxlo5pVrN9x9w/Uy051rkmh3IA2feFB6BqCIcr67RIWJcohtxR1aKnt SZsAveEQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1thKCU-0000000G366-46DM; Mon, 10 Feb 2025 03:11:10 +0000 Received: from mx0a-0031df01.pphosted.com ([205.220.168.131]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1thKB6-0000000G2wk-0Hu7 for linux-arm-kernel@lists.infradead.org; Mon, 10 Feb 2025 03:09:45 +0000 Received: from pps.filterd (m0279865.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 519KIPgQ009545; Mon, 10 Feb 2025 03:09:34 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= pyxopfq01qIFG3pHou1VqDKtq+2Cvr5wueyIRGqt7Nw=; b=XINvUSvzgJINdMlV 8MUc1ugbYkxE+OkqobWw7X0IY806Ad3nvtCe0i8+bPU3s3HnX2x0pMmftUZRRE87 oEQJQAsIBJzJzwyirzGeXa2hVQe0Lf3hSmv+tTVjFLzFbaI8qRKRYJN9A2ghyNdC rtpGHS1oLm+Y1UVahpR9DRxf9ysdYxDrN0/uLhlUt8TKQxPPGQmnuWdJByZz9e4B 8I1iBD+u1RkMxFOOrbxD9jhqsU8kp4jMsjUm4E6WVH56U8ptCywcWhUh+53zS9LT MctaJhefa3fNWzcr2O3d4MIvWQgwX5PSxumJ4SH8TuXm8N3RihtxBjQGkQyeq8zq +ajfww== Received: from nalasppmta02.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 44p0f72x6f-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 10 Feb 2025 03:09:34 +0000 (GMT) Received: from nalasex01c.na.qualcomm.com (nalasex01c.na.qualcomm.com [10.47.97.35]) by NALASPPMTA02.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTPS id 51A39XJv013735 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 10 Feb 2025 03:09:33 GMT Received: from [10.253.11.86] (10.80.80.8) by nalasex01c.na.qualcomm.com (10.47.97.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Sun, 9 Feb 2025 19:09:23 -0800 Message-ID: <46423f11-9642-4239-af5d-3eb3b548b98c@quicinc.com> Date: Mon, 10 Feb 2025 11:09:03 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/4] net: stmmac: dwmac-qcom-ethqos: Mask PHY mode if configured with rgmii-id To: Konrad Dybcio , Krzysztof Kozlowski , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Vinod Koul , Maxime Coquelin , Alexandre Torgue , Bjorn Andersson , Konrad Dybcio , Richard Cochran CC: , , , , , References: <20250121-dts_qcs615-v3-0-fa4496950d8a@quicinc.com> <20250121-dts_qcs615-v3-2-fa4496950d8a@quicinc.com> <30450f09-83d4-4ff0-96b2-9f251f0c0896@kernel.org> <48ce7924-bbb7-4a0f-9f56-681c8b2a21bd@quicinc.com> <2bd19e9e-775d-41b0-99d4-accb9ae8262d@kernel.org> <71da0edf-9b2a-464e-8979-8e09f7828120@oss.qualcomm.com> Content-Language: en-US From: Yijie Yang In-Reply-To: <71da0edf-9b2a-464e-8979-8e09f7828120@oss.qualcomm.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01c.na.qualcomm.com (10.47.97.35) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: 9UFZc4nDbCM3vzlrXRaDfvajb5-5fsgx X-Proofpoint-ORIG-GUID: 9UFZc4nDbCM3vzlrXRaDfvajb5-5fsgx X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-02-10_02,2025-02-07_03,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 mlxscore=0 suspectscore=0 lowpriorityscore=0 phishscore=0 malwarescore=0 impostorscore=0 mlxlogscore=999 clxscore=1015 bulkscore=0 adultscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2501170000 definitions=main-2502100023 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250209_190944_117203_A8957AD3 X-CRM114-Status: GOOD ( 24.66 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2025-01-27 18:49, Konrad Dybcio wrote: > On 22.01.2025 10:48 AM, Krzysztof Kozlowski wrote: >> On 22/01/2025 09:56, Yijie Yang wrote: >>> >>> >>> On 2025-01-21 20:47, Krzysztof Kozlowski wrote: >>>> On 21/01/2025 08:54, Yijie Yang wrote: >>>>> The Qualcomm board always chooses the MAC to provide the delay instead of >>>>> the PHY, which is completely opposite to the suggestion of the Linux >>>>> kernel. >>>> >>>> >>>> How does the Linux kernel suggest it? >>>> >>>>> The usage of phy-mode in legacy DTS was also incorrect. Change the >>>>> phy_mode passed from the DTS to the driver from PHY_INTERFACE_MODE_RGMII_ID >>>>> to PHY_INTERFACE_MODE_RGMII to ensure correct operation and adherence to >>>>> the definition. >>>>> To address the ABI compatibility issue between the kernel and DTS caused by >>>>> this change, handle the compatible string 'qcom,qcs404-evb-4000' in the >>>>> code, as it is the only legacy board that mistakenly uses the 'rgmii' >>>>> phy-mode. >>>>> >>>>> Signed-off-by: Yijie Yang >>>>> --- >>>>> .../net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c | 18 +++++++++++++----- >>>>> 1 file changed, 13 insertions(+), 5 deletions(-) >>>>> >>>>> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c >>>>> index 2a5b38723635b5ef9233ca4709e99dd5ddf06b77..e228a62723e221d58d8c4f104109e0dcf682d06d 100644 >>>>> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c >>>>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c >>>>> @@ -401,14 +401,11 @@ static int ethqos_dll_configure(struct qcom_ethqos *ethqos) >>>>> static int ethqos_rgmii_macro_init(struct qcom_ethqos *ethqos) >>>>> { >>>>> struct device *dev = ðqos->pdev->dev; >>>>> - int phase_shift; >>>>> + int phase_shift = 0; >>>>> int loopback; >>>>> >>>>> /* Determine if the PHY adds a 2 ns TX delay or the MAC handles it */ >>>>> - if (ethqos->phy_mode == PHY_INTERFACE_MODE_RGMII_ID || >>>>> - ethqos->phy_mode == PHY_INTERFACE_MODE_RGMII_TXID) >>>>> - phase_shift = 0; >>>>> - else >>>>> + if (ethqos->phy_mode == PHY_INTERFACE_MODE_RGMII_ID) >>>>> phase_shift = RGMII_CONFIG2_TX_CLK_PHASE_SHIFT_EN; >>>>> >>>>> /* Disable loopback mode */ >>>>> @@ -810,6 +807,17 @@ static int qcom_ethqos_probe(struct platform_device *pdev) >>>>> ret = of_get_phy_mode(np, ðqos->phy_mode); >>>>> if (ret) >>>>> return dev_err_probe(dev, ret, "Failed to get phy mode\n"); >>>>> + >>>>> + root = of_find_node_by_path("/"); >>>>> + if (root && of_device_is_compatible(root, "qcom,qcs404-evb-4000")) >>>> >>>> >>>> First, just check if machine is compatible, don't open code it. >>>> >>>> Second, drivers should really, really not rely on the machine. I don't >>>> think how this resolves ABI break for other users at all. >>> >>> As detailed in the commit description, some boards mistakenly use the >>> 'rgmii' phy-mode, and the MAC driver has also incorrectly parsed and >> >> That's a kind of an ABI now, assuming it worked fine. > > I'm inclined to think it's better to drop compatibility given we're talking > about rather obscure boards here. > > $ rg 'mode.*=.*"rgmii"' arch/arm64/boot/dts/qcom -l > > arch/arm64/boot/dts/qcom/sa8155p-adp.dts > arch/arm64/boot/dts/qcom/qcs404-evb-4000.dts > > QCS404 seems to have zero interest from anyone (and has been considered > for removal upstream..). > > The ADP doesn't see much traction either, last time around someone found > a boot breaking issue months after it was committed. But what about the out-of-tree boards that Andrew mentioned? We need to ensure we don't break them, right? > > Konrad -- Best Regards, Yijie