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Mon, 24 Aug 2026 06:46:40 -0700 (PDT) X-Received: by 2002:a05:6102:1594:b0:778:30ee:f44a with SMTP id ada2fe7eead31-77a5f2e70b7mr3427912137.0.1787579200146; Mon, 24 Aug 2026 06:46:40 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6a59e00108asm13140614a12.2.2026.08.24.06.46.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 24 Aug 2026 06:46:39 -0700 (PDT) Message-ID: Date: Mon, 24 Aug 2026 15:46:36 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 6/9] usb: misc: qcom_eud: add role-based EUD control To: Elson Serrao , 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> <20260811213610.2956147-7-elson.serrao@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260811213610.2956147-7-elson.serrao@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI0MDExNiBTYWx0ZWRfX7Eo7rLvcb+NG lazbAYKXqw4lQ2vcGJqQF/5M8fQWYVjEhfgLNcJLOjk6wBzyWQ7WY9vkuaGxnGeNcsjzGY+bKa/ 4gn6GwLRNOstE+cnwCyFF/HwIPIBiEmmZTFep3ltsEKePEv6Ij9pUBWDmXEZvw3RLdrqv7ewNtd 0FeaY3Ap+NEwgYc4qgEYx76YA89PBwE3cpiXIIqanXBEn4YIoyQaOosgzYGf/MnXcwk2drvdPGu HPtMjl4ymPS3K4TU2AqnGhQt6PLqEHlXymzxmVPNAShLUHBIw0+3JJ4pb1byIFklKHVEZWwHlVX W7R8Mff3cwtZtb+FCFp1fcHomD83AXHADKKASEir8xdylGyX17UGmPDCGh1cA8O6CuK7CNkDvig sIv3m373okswLxZvvJpE6ks2oUDGeuNCApqPOqfOKYxfNDc0AFV23AL3vCk1RyUA3cT7Yvx9+n0 TKNjlk/+sQlHflGRPDQ== X-Authority-Analysis: v=2.4 cv=JL0LdcKb c=1 sm=1 tr=0 ts=6a8c4b41 cx=c_pps a=N1BjEkVkxJi3uNfLdpvX3g==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=X7E0pNrBJpJ0GBZA2WEA:9 a=QEXdDO2ut3YA:10 a=crWF4MFLhNY0qMRaF8an:22 X-Proofpoint-Spam-Info: AW1haW4tMjYwODI0MDExNiBTYWx0ZWRfX4DNBXo6OotWB cRTiMs9XQvkvX3ibnilaubvPEIiceKCbmHINuSY30j6InTVdaqm52UqK7FhZjaGQAjcct41u5qR 7R3tIteTKYkFTYW4nrbliu17j89MbL0= X-Proofpoint-GUID: iwQD7lKT-gNS7QlwtxtU5T8uwFJ7Kase X-Proofpoint-ORIG-GUID: iwQD7lKT-gNS7QlwtxtU5T8uwFJ7Kase 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=2026-08-24_04,2026-08-24_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 suspectscore=0 clxscore=1015 impostorscore=0 priorityscore=1501 adultscore=0 bulkscore=0 malwarescore=0 spamscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608240116 On 8/11/26 11:36 PM, Elson Serrao wrote: > EUD functions by presenting itself as a USB device to the host PC and is > therefore only applicable when the port operates in device role. Keeping > EUD enabled in other roles provides no benefit and unnecessarily keeps > the associated PHY resources enabled. Furthermore, enabling EUD in host > role can cause the USB controller to misbehave because the EUD hub > supports only a single upstream-facing port. > > Address this by treating EUD as usable only in device role. The > role-switch callback enables or disables EUD as the port enters or > leaves device role. A sysfs enable request made outside device role is > recorded and honored when the port subsequently switches to device role. > > Reviewed-by: Peter Chen > Signed-off-by: Elson Serrao > --- Reviewed-by: Konrad Dybcio Konrad