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Fri, 23 Oct 2026 01:01:11 -0700 (PDT) Received: from [192.168.226.26] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c46a5c848c3sm71563466b.38.2026.10.23.01.01.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 23 Oct 2026 01:01:09 -0700 (PDT) Message-ID: <5422680d-e642-4a85-9119-6a5ac5443d50@oss.qualcomm.com> Date: Fri, 23 Oct 2026 10:01:07 +0200 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 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] usb: typec: mux: fsa4480: Keep the USB 2.0 switch on in DP-only modes To: Joonhoe Kim <26rote@gmail.com>, 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 References: <20261022165143.1327-1-26rote@gmail.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20261022165143.1327-1-26rote@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDIzMDAzMSBTYWx0ZWRfX3hTnRvd1Bm7R r0YHhcOXz/Gje6AipCx3NXBnxryqDj+CsaIwb/LTBdyjVgcf7RHk4lLjgIQzNfk1gy4Qer5qQQD M/0Qt0CxI/2ELgnV33GKqdGQvix48O+m9KGJuQxb16uQylFcjB/BrmfOdp8xr8tW5SbbgPC+P2g IAyISR+vhdaQ4EIKweEVQRTB/9ieIYTrc6KROfnj657lhg0ttgxPA3LLKtT8yPgBiNERpZw2NDE 6POdR0T+WC8HjQ2mSADyRjBWT5TPyn8NB+5MTlcxRdERTtSC+2AgKyDGP+EvsXlLIjFi3irzRrk yGqRRwppRKi1A+/V9E8x2DTIG8kyNIJFmeGhcwz5WSewTPd8G/eRBPgjUrUmzcz4xH6dzzcoNFu bqhCIdWrsJMxnWxIAbWuoyYHvzSaQRjAPAcEBJg2rRWJT8L+t3llzK6vnC6G54V02kpHwPKBxJF FPvPg/fRNNTIGkBgoAQ== X-Proofpoint-GUID: l2Wh_4FbyAaa-R-PecoimofUfif642aj X-Proofpoint-Spam-Info: AW1haW4tMjYxMDIzMDAzMSBTYWx0ZWRfX6hk2WxvDJ7m2 z+Sf0VnTOhnnLBMR5kfjCEIZb04sPFHIjS4DYcJs3EvW9fXrkuXk73RO0FZgDHKwTRLJ5a6BIc5 S8FODdZxSnQ2zKXBXKYitAW+1WeuA3I= X-Authority-Analysis: v=2.4 cv=UdbE26SN c=1 sm=1 tr=0 ts=6adb1448 cx=c_pps a=R6oCqFB+Yf/t2GF8e0/dFg==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=JsmhxD-A5SsRL_Tr:21 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=pGLkceISAAAA:8 a=EUspDBNiAAAA:8 a=PfqxLEJM1DhM-lXbwakA:9 a=QEXdDO2ut3YA:10 a=TD8TdBvy0hsOASGTdmB-:22 X-Proofpoint-ORIG-GUID: l2Wh_4FbyAaa-R-PecoimofUfif642aj 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=2026-10-23_02,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 phishscore=0 bulkscore=0 clxscore=1015 adultscore=0 priorityscore=1501 suspectscore=0 lowpriorityscore=0 spamscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610230031 On 10/22/26 6:51 PM, Joonhoe Kim wrote: > 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> > --- Reviewed-by: Konrad Dybcio Konrad