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Thu, 22 Oct 2026 09:51:45 -0700 (PDT) Received: from DESKTOP-NM9EKIA ([125.134.240.130]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1959dd144aasm46566c88.0.2026.10.22.09.51.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Oct 2026 09:51:44 -0700 (PDT) From: Joonhoe Kim <26rote@gmail.com> To: heikki.krogerus@linux.intel.com, gregkh@linuxfoundation.org Cc: neil.armstrong@linaro.org, linux-usb@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] usb: typec: mux: fsa4480: Keep the USB 2.0 switch on in DP-only modes Date: Fri, 23 Oct 2026 01:51:43 +0900 Message-ID: <20261022165143.1327-1-26rote@gmail.com> X-Mailer: git-send-email 2.55.0.windows.5 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 DisplayPort pin assignments C and E give all four SuperSpeed lanes to DisplayPort, but the USB 2.0 D+/D- pair is not part of the pin assignment and stays available. The FSA4480 sits on that pair, and in these modes the driver turns its USB switch off, so a USB 2.0 hub or device behind a DisplayPort sink is disconnected as soon as the DisplayPort mode is set. Configure the USB switch the same way in all DisplayPort modes. Fixes: c7054c31c1c9 ("usb: typec: fsa4480: rework mux & switch setup to handle more states") Signed-off-by: Joonhoe Kim <26rote@gmail.com> --- Tested on a Lenovo Y700 Gen 5 (TB323FU, Kaanapali; out-of-tree board support) with a USB-C monitor in pin assignment C: its USB 2.0 hub was disconnected when the mux was set; with this change the hub and the keyboard behind it stay connected. drivers/usb/typec/mux/fsa4480.c | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) diff --git a/drivers/usb/typec/mux/fsa4480.c b/drivers/usb/typec/mux/fsa4480.c index bea0c1deec94..e05ab3c10c81 100644 --- a/drivers/usb/typec/mux/fsa4480.c +++ b/drivers/usb/typec/mux/fsa4480.c @@ -93,16 +93,9 @@ static int fsa4480_set(struct fsa4480 *fsa) sel = FSA4480_SEL_USB; } else if (fsa->svid) { switch (fsa->mode) { - /* DP Only */ case TYPEC_DP_STATE_C: - case TYPEC_DP_STATE_E: - enable |= FSA4480_ENABLE_SBU; - if (reverse) - sel = FSA4480_SEL_SBU_REVERSE; - break; - - /* DP + USB */ case TYPEC_DP_STATE_D: + case TYPEC_DP_STATE_E: case TYPEC_DP_STATE_F: enable |= FSA4480_ENABLE_USB | FSA4480_ENABLE_SBU; sel = FSA4480_SEL_USB; base-commit: 2efb7a11f1aa4d2dc285fe2680cca22cb9f72f64 -- 2.43.0