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[103.229.18.19]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-141860ec7f7sm32335970c88.6.2026.08.24.22.08.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Aug 2026 22:08:47 -0700 (PDT) From: Varadarajan Narayanan Date: Tue, 25 Aug 2026 10:38:33 +0530 Subject: [PATCH 2/2] usb: dwc3: qcom: Allow the glue layer to pass ref_clk to the core Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260825-ctrl-v1-2-609e2291814d@oss.qualcomm.com> References: <20260825-ctrl-v1-0-609e2291814d@oss.qualcomm.com> In-Reply-To: <20260825-ctrl-v1-0-609e2291814d@oss.qualcomm.com> To: Greg Kroah-Hartman , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Wesley Cheng , Thinh Nguyen Cc: linux-arm-msm@vger.kernel.org, linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Varadarajan Narayanan X-Mailer: b4 0.14.3 X-Proofpoint-GUID: _QqBhtA72LNKhYG0OQ1WOi9jesMptwti X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI1MDA0MSBTYWx0ZWRfX1Oy9CR1TrnQf VgnKORYwsCwTHGFwzDmmJ2DtlHC6ltoltSn/fS4qx2W758/rdcZ+DGv0ISm+iRq0U3IIBNVoLeo PZFCA/Ebq3bjDK5iVA3LrxkysCYD1MQvrB2EhSSZTy29qnw8CiXOzG6DE1tsokNrzw0mh5cc/Ow yTOnmUzVVHPkLW9fBjTx39wDMpiQNOXQZCy8R+bstSluO4nnQW6piKgJcUwDLqMdz6Sa+Wa9Cbe RoWOq8kNwT3ZEVEfzp16CrG7gm5YAEqPo3KhAv+/nxkatLm1+kRorjBuu7NQyCNrjje+6GOv7eB LzEcu/vjRek+VrFmHrPCX9mzOGKQDGlrqHZzQXmRksIUScdD4YRxemQ89MTqrgR8DRggk/ewrDC km6vqhmzXJgmx1++UyKSp8McPi836iDIAmTHMSbGhqRUN6MLOYMCm9ec3SYEYmt79186WFaUf7/ 8trKGVpAtPyftOyub3A== X-Proofpoint-Spam-Info: AW1haW4tMjYwODI1MDA0MSBTYWx0ZWRfXwg8huJAExgEK 7Qsfn2zPDWXWKtgflr6aCCVCE/LrY0e/UBhBFL73G1onIBOjlC0txqFKn59ljKEPBUSICgJSpcS S2+ulDyt+7jYjhjvYJNi3fBN6nRsdIQ= X-Authority-Analysis: v=2.4 cv=L7ItheT8 c=1 sm=1 tr=0 ts=6a8d2362 cx=c_pps a=0uOsjrqzRL749jD1oC5vDA==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=EUspDBNiAAAA:8 a=nsXwHlzZWJbxCLJ-4VsA:9 a=QEXdDO2ut3YA:10 a=mQ_c8vxmzFEMiUWkPHU9:22 X-Proofpoint-ORIG-GUID: _QqBhtA72LNKhYG0OQ1WOi9jesMptwti X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-25_01,2026-08-24_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 adultscore=0 bulkscore=0 priorityscore=1501 lowpriorityscore=0 malwarescore=0 impostorscore=0 spamscore=0 clxscore=1015 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608250041 The dwc3-qcom glue layer sets probe_data.ignore_clocks_and_resets before calling dwc3_core_probe(), so the DWC3 core does not acquire ref_clk on its own. This prevents dwc3_ref_clk_period() from programming GUCTL and GFLADJ from the reference clock rate. The deprecated snps,ref-clock-period-ns property is not a suitable replacement on IPQ9650. Its 24 MHz reference clock has a period of about 41.66 ns, while using 41 ns makes the calculated FLADJ value become 0 and leaves the reference clock configuration incorrect. Allow the Qualcomm glue driver to provide ref_clk to the DWC3 core for platforms that may need it. Signed-off-by: Varadarajan Narayanan --- drivers/usb/dwc3/dwc3-qcom.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c index ac68b4218b56..2d6de6469c1e 100644 --- a/drivers/usb/dwc3/dwc3-qcom.c +++ b/drivers/usb/dwc3/dwc3-qcom.c @@ -705,6 +705,13 @@ static int dwc3_qcom_probe(struct platform_device *pdev) probe_data.res = &res; probe_data.ignore_clocks_and_resets = true; probe_data.properties = DWC3_DEFAULT_PROPERTIES; + + qcom->dwc.ref_clk = devm_clk_get_optional(dev, "ref_clk"); + if (IS_ERR_OR_NULL(qcom->dwc.ref_clk)) { + qcom->dwc.ref_clk = NULL; + dev_info(dev, "NOT setting dwc.ref_clk\n"); + } + ret = dwc3_core_probe(&probe_data); if (ret) { ret = dev_err_probe(dev, ret, "failed to register DWC3 Core\n"); -- 2.34.1