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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ab7b77d58bdsm351070566b.130.2025.02.10.10.01.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 Feb 2025 10:01:07 -0800 (PST) Message-ID: <60fecdb9-d039-4f76-a368-084664477160@oss.qualcomm.com> Date: Mon, 10 Feb 2025 19:01:04 +0100 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: Yijie Yang , 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: netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org 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> <46423f11-9642-4239-af5d-3eb3b548b98c@quicinc.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <46423f11-9642-4239-af5d-3eb3b548b98c@quicinc.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: ZO9jEYYUXEVD73Qkqyi7pkSiePPKzQHr X-Proofpoint-ORIG-GUID: ZO9jEYYUXEVD73Qkqyi7pkSiePPKzQHr 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_09,2025-02-10_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 suspectscore=0 phishscore=0 impostorscore=0 adultscore=0 clxscore=1015 mlxscore=0 malwarescore=0 bulkscore=0 lowpriorityscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2501170000 definitions=main-2502100147 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250210_100111_688070_C0D5C384 X-CRM114-Status: GOOD ( 26.50 ) 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 10.02.2025 4:09 AM, Yijie Yang wrote: > > > 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? No. What's not on the list, doesn't exist Konrad