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Mon, 24 Aug 2026 20:15:17 -0700 (PDT) X-Received: by 2002:a17:902:fc46:b0:2d6:dfa7:fad4 with SMTP id d9443c01a7336-2d6dfa7ff18mr60427295ad.0.1787627717013; Mon, 24 Aug 2026 20:15:17 -0700 (PDT) Received: from [192.168.1.132] ([70.95.199.79]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-32801d7f812sm28570652eec.1.2026.08.24.20.15.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 24 Aug 2026 20:15:16 -0700 (PDT) Message-ID: <502df11d-c372-445d-99a8-512fdb0e9a4c@oss.qualcomm.com> Date: Mon, 24 Aug 2026 20:15:14 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 4/9] usb: misc: qcom_eud: add per-path role switch support To: Konrad Dybcio , Bjorn Andersson , Dmitry Baryshkov , Greg Kroah-Hartman , Konrad Dybcio , Krzysztof Kozlowski , Peter Chen , Rob Herring , Conor Dooley Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260811213610.2956147-1-elson.serrao@oss.qualcomm.com> <20260811213610.2956147-5-elson.serrao@oss.qualcomm.com> Content-Language: en-US From: Elson Serrao In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=O5QJeh9W c=1 sm=1 tr=0 ts=6a8d08c6 cx=c_pps a=MTSHoo12Qbhz2p7MsH1ifg==:117 a=uHxescsG3rBdxcXwcPaeSg==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=L8Mv0my-441DvGKMhw0A:9 a=QEXdDO2ut3YA:10 a=GvdueXVYPmCkWapjIL-Q:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI1MDAyNCBTYWx0ZWRfX0r+qW2GjnZmb g7X6O8UeBsuX5j471OIOPtVPPVguBbxeFEZLH9UeUip6H8WbTXGCY4MJmW7Kb3TONc6M280T3Y4 BqH8UHTW+Fh29Xn6D2gtnjKwU8GRbTUbdpIA/eSADvaiJjs/3vZV0FxnRD8Kd9Ejp9MM6Vvinkz taljLKGF/7SP5AvnuBjZ2vvvWF9qzCSWkDzMQkYtErdD2zfO98/OOjhaQ7W9abZO2FH9mbMzvSL WqOYUKfo2OIJqhLnCfwv2T5p2ijsQpL05W35hRn8jYZnFK8xvHaGmN5bSKwb4UU0IwI5K6rbL4/ oEDwugV2Tf9xLVm35uegItqIU0hdla9JHPDAj00Kd/fTZx/xr5v0sg2N2grKXS0UZ8Q/jWcn5fy MeruJ8xfO2TZwRzKDpFc/DDYZ1Z8CU97pYAflhCxtPUxkPkPpUmyOYcA4XWFFlUhxGqbwaefBoj jr9j1A6hXakl3xAkHxQ== X-Proofpoint-Spam-Info: AW1haW4tMjYwODI1MDAyNCBTYWx0ZWRfX/lu5CXZeuAvk mpYz6jOpg/RQ+OnwCTuiEErTxkBf0dnXSkgAu6tiAsuLRaZ7ZmDxjQ+xH5UmC9oIQP9wzW0OTYY VkaqlqaB1MXTkXhJ+akjz4Wq+y1B+Cs= X-Proofpoint-GUID: _MDV_XzyH_x6c5qcYfHzciavu70ujSSj X-Proofpoint-ORIG-GUID: _MDV_XzyH_x6c5qcYfHzciavu70ujSSj 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 lowpriorityscore=0 spamscore=0 adultscore=0 bulkscore=0 suspectscore=0 priorityscore=1501 malwarescore=0 clxscore=1015 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608250024 On 8/24/2026 6:44 AM, Konrad Dybcio wrote: > On 8/11/26 11:36 PM, Elson Serrao wrote: >> The EUD hardware can support multiple High-Speed USB paths, each connected >> to different USB controllers. The current implementation uses a single >> chip-level role switch, which cannot properly handle multi-path >> configurations where each path needs independent role management. Since >> EUD is physically present between the USB connector and the controller, >> it should also relay the role change requests from the connector. > > [...] > >> + if (!strcmp(dr_mode, "host")) >> + path->curr_role = USB_ROLE_HOST; >> + else if (!strcmp(dr_mode, "peripheral")) >> + path->curr_role = USB_ROLE_DEVICE; >> + else >> + path->curr_role = USB_ROLE_NONE; >> + >> + /* No role switch needed for fixed role controllers */ >> + if (path->curr_role != USB_ROLE_NONE) { >> + of_node_put(controller_node); >> + return 0; >> + } > > IIUC think this is a bit of a convoluted way intending to say: > > if dr_mode != effectively_otg > return > > I don't think there's much of a better choice in APIs here, so let's > maybe just do something like: > > if (host || peripheral) > return 0; > > directly (i.e. without making ROLE_NONE the "desired case" as that > is very much not obvious) > Sure. I will change this in v7 Thanks Elson