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Wed, 28 Oct 2026 11:59:59 -0700 (PDT) Received: from hu-faisalh-hyd.qualcomm.com ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36a239a56e9sm8639936eec.27.2026.10.28.11.59.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Oct 2026 11:59:58 -0700 (PDT) From: Faisal Hassan To: linux-usb@vger.kernel.org Cc: Krzysztof Kozlowski , Thinh Nguyen , Krishna Kurapati , Sriram Dash , Mathias Nyman , Greg Kroah-Hartman , linux-kernel@vger.kernel.org Subject: [PATCH v4 4/7] usb: host: xhci-plat: Support XHCI_RESET_ON_RESUME via device property Date: Thu, 29 Oct 2026 00:29:34 +0530 Message-Id: <6499d6761ba6f338544fc8a90b4a96e55b5b4b12.1793212717.git.faisal.hassan@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDI4MDA3NSBTYWx0ZWRfXxxzJ9vYHBzUK A+i3dEbacDsuoajvdx1AMVvWBgtb0rkKHVHwnUUBH8EbGpsCIBOfH7rWEY7Yax31U0hh+B8qcY0 f8U1PbNAKfG4k7aQrt0IsccCieDooc4gflFCiZbSCKQkHVyJpJvoXjP4qGYnQzzEAYdjIAPi8Xy ks+fLqR1bS6NYnb0NRVTCn7r9LdaiJPlIh9w7svgiQEZqTvRCJ76XCadoF/5ipXObNse1aDfLlS a6YjbRTp8yAV7jyV05ah4opJmExApwyamRZnbZKxcOiw8lV1TBiXn99eZsW9p8cBqZY4IQBJ3IZ LuH+QSvR+K1Cf4HldfaGNm8DBZDek1Cgpg6SSqedIDK7mr+SijlVEui0PZu0OV1CPlx/HUY53DB rlEZkFIdlYQCQVc1cQDux2kCZdgwY8XViJnF4dCNqZw8xb67Ugh/Ru25p7ja5P7fWa1N5QlMszY ZnuiXIVM2pErJvJyHOg== X-Proofpoint-Spam-Info: AW1haW4tMjYxMDI4MDA3NSBTYWx0ZWRfX5ve4tjV2Unzm yy5WUifHeSMwtg2MvugXBD3BQdYBiIG6hR2vPFSQdMX4rzqO0XI4dHG8O793W8KGAvdqtTyPaS4 pe5/DrdMLe3zgwPMBQdNOQ9AYQ8PX1k= X-Authority-Analysis: v=2.4 cv=LoAHWXdc c=1 sm=1 tr=0 ts=6ae24630 cx=c_pps a=PfFC4Oe2JQzmKTvty2cRDw==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=Um2Pa8k9VHT-vaBCBUpS:22 a=EUspDBNiAAAA:8 a=A6Vjp3zFaTA1NjdqV2IA:9 a=6Ab_bkdmUrQuMsNx7PHu:22 X-Proofpoint-GUID: RfVfLFk_Ii4-_A0vVqzBw_7SAOmadpAX X-Proofpoint-ORIG-GUID: RfVfLFk_Ii4-_A0vVqzBw_7SAOmadpAX X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-10-28_06,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 adultscore=0 clxscore=1015 phishscore=0 suspectscore=0 bulkscore=0 priorityscore=1501 spamscore=0 impostorscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610280075 When the USB controller loses power during PM suspend (as occurs on targets like SA8255P that fully power off the controller), it generates a Host Controller Error (HCE) on resume requiring full reinitialization. This is handled by the XHCI_RESET_ON_RESUME quirk (introduced upstream in 8b328f8002bc). Read the "xhci-reset-on-resume-quirk" device property to set XHCI_RESET_ON_RESUME. This allows parent drivers (e.g., dwc3) to enable the quirk via software nodes. Co-developed-by: Sriram Dash Signed-off-by: Sriram Dash Signed-off-by: Faisal Hassan --- drivers/usb/host/xhci-plat.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c index 6fd595f81a30..0093ed24ac3f 100644 --- a/drivers/usb/host/xhci-plat.c +++ b/drivers/usb/host/xhci-plat.c @@ -277,6 +277,9 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s if (device_property_read_bool(tmpdev, "xhci-skip-phy-init-quirk")) xhci->quirks |= XHCI_SKIP_PHY_INIT; + if (device_property_read_bool(tmpdev, "xhci-reset-on-resume-quirk")) + xhci->quirks |= XHCI_RESET_ON_RESUME; + device_property_read_u32(tmpdev, "imod-interval-ns", &xhci->imod_interval); device_property_read_u16(tmpdev, "num-hc-interrupters", -- 2.34.1