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Mon, 12 Oct 2026 02:37:11 -0700 (PDT) Received: from hu-prashk-hyd.qualcomm.com ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3ab38ff0ce7sm16637814a91.15.2026.10.12.02.37.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 Oct 2026 02:37:11 -0700 (PDT) From: Prashanth K To: Thinh Nguyen , Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Prashanth K Subject: [PATCH] usb: dwc3: Use the correct PHY mode for USB3 PHY Date: Mon, 12 Oct 2026 15:07:04 +0530 Message-Id: <20261012093704.2762263-1-prashanth.k@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDEyMDAzOCBTYWx0ZWRfX3JxkttFtZyz+ mVWDxGrCoWVML+zRaxF/luycLrNxoLGpAd36ZvQdp6Pp7KGNvGYl7ZxJICs32y/u0kG0R3N8Akn +rUCHH3re5uDqGajyJp0ZdqLWzhjrl/snG0EWY996vUI6TdB3738pgY2I5Rue74D7rskANW2QxW SJAr1lhGpT40/iiNeLoZsxsG9j359nTksm5vuJpyk3sOnLN+YXAflxBhVuwGYMutZQWAizcY0ix eNejtcTpVl03b6bfPVqpTIcUVu1p/y74rkFbNqivfRQJBOOVDtzWy9JsZu3Vdy5wAZiaM2D0ujI htfbLBhVvgAPWcF/9oKC3za5xeWb2N4HWlziup6a2dYoPjiHetoZp2+Q/fgBusopWfkoqVL+kaN lILnz5MCfUN9vHnih58uVWKa5u5vMWXUYBp1Wi/BxQurpwmUtuPWw6R+snQKl+q9hJV2jNzTBHt gI7etm0SL2uZI+4vdxw== X-Proofpoint-ORIG-GUID: _HcYcVo8dl8oHm9-BDJgQFh3BeMce9VG X-Proofpoint-GUID: _HcYcVo8dl8oHm9-BDJgQFh3BeMce9VG X-Authority-Analysis: v=2.4 cv=W5utxhWk c=1 sm=1 tr=0 ts=6accaa48 cx=c_pps a=vVfyC5vLCtgYJKYeQD43oA==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=EUspDBNiAAAA:8 a=g4LtLXktVRgdyDEntd0A:9 a=rl5im9kqc5Lf4LNbBjHf:22 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDEyMDAzOCBTYWx0ZWRfX3S+tmd1g0mjd IPJgBtVO8x67/eqm21B3OtWOkbkMKizM8jpYxAc6hEhxuV+HprsyxMvfiyhGt/7RpLADZ0o24LJ SdjtBzIdl4R3pLy9vAbbMAALmQKLY78= 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=2026-10-12_03,2026-10-09_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 adultscore=0 phishscore=0 malwarescore=0 impostorscore=0 bulkscore=0 suspectscore=0 spamscore=0 lowpriorityscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610120038 DWC3 currently configures USB3 PHYs with PHY_MODE_USB_HOST when switching the controller to host mode. Even though usb_add_hcd() sets the flag corrrectly, it gets overwritten in DWC3 layer. Some PHY drivers distinguish between USB2 and SS host modes and expect USB3 PHYs to be configured with PHY_MODE_USB_HOST_SS. Using PHY_MODE_USB_HOST may result in incorrect PHY programming. Fix this by using PHY_MODE_USB_HOST_SS for USB3 PHYs. Signed-off-by: Prashanth K --- drivers/usb/dwc3/core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index fd5c2cd36c59..1bb87a370725 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -251,7 +251,7 @@ static void __dwc3_set_mode(struct work_struct *work) for (i = 0; i < dwc->num_usb2_ports; i++) phy_set_mode(dwc->usb2_generic_phy[i], PHY_MODE_USB_HOST); for (i = 0; i < dwc->num_usb3_ports; i++) - phy_set_mode(dwc->usb3_generic_phy[i], PHY_MODE_USB_HOST); + phy_set_mode(dwc->usb3_generic_phy[i], PHY_MODE_USB_HOST_SS); if (dwc->dis_split_quirk) { reg = dwc3_readl(dwc, DWC3_GUCTL3); @@ -1643,7 +1643,7 @@ static int dwc3_core_init_mode(struct dwc3 *dwc) for (i = 0; i < dwc->num_usb2_ports; i++) phy_set_mode(dwc->usb2_generic_phy[i], PHY_MODE_USB_HOST); for (i = 0; i < dwc->num_usb3_ports; i++) - phy_set_mode(dwc->usb3_generic_phy[i], PHY_MODE_USB_HOST); + phy_set_mode(dwc->usb3_generic_phy[i], PHY_MODE_USB_HOST_SS); ret = dwc3_host_init(dwc); if (ret) -- 2.34.1