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Tue, 18 Aug 2026 02:57:12 -0700 (PDT) X-Received: by 2002:ac8:5fd1:0:b0:51b:f40b:2fa2 with SMTP id d75a77b69052e-52d852d4f3dmr228655901cf.1.1787047032035; Tue, 18 Aug 2026 02:57:12 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c2185bab858sm129104866b.53.2026.08.18.02.57.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 18 Aug 2026 02:57:11 -0700 (PDT) Message-ID: <398f2270-9d7f-4e23-bf4f-ef02186a2be7@oss.qualcomm.com> Date: Tue, 18 Aug 2026 11:57:07 +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 04/10] phy: qcom-usb-hsic: engage HSIC mode from phy_calibrate() To: Dmitry Baryshkov , Bartosz Golaszewski , Bjorn Andersson , Linus Walleij , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Greg Kroah-Hartman , Xu Yang , Peng Fan , Vinod Koul , Neil Armstrong , Peter Chen , Pavankumar Kondeti , Stephen Boyd , Konrad Dybcio Cc: Krzysztof Kozlowski , linux-arm-msm@vger.kernel.org, linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, linux-phy@lists.infradead.org, Greg Kroah-Hartman , Peter Chen References: <20260810-msm8974-usb-hsic-v1-0-e5f93ea76ffa@oss.qualcomm.com> <20260810-msm8974-usb-hsic-v1-4-e5f93ea76ffa@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260810-msm8974-usb-hsic-v1-4-e5f93ea76ffa@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODE4MDA3MyBTYWx0ZWRfX683KW+kCNZkB 3qQUaigf/Kdr549DonvX7T6+OA09VZ3szny8+fEx9N8O4zFIWkLPTwWBaOOP2Zdh/5X+lAvtNj0 vfQcC6AcozDk7bLFenmGV+8Id7a1X4WK64sRd1MGDRZy9lT7W6vQsfKroZAucxCqt8pOmA2Hy5+ jtM7CfrhBeRQSM+AsCktreO8rSDuPJpo3JEsPn+sAGKvAnbtro+OhyyR8xTwjqTU1sLNdDQ1tTB 5N9HeLzBowNtUPkrJCQxCNQO8cw7ZiVZ+KtGqn8TYnybjg59OmMSfWm6IhGCxiu4QisBxl5t0Kv h/FyBtoklZ6whUQUCDOmfs4xy7ATYIJk2GPkcwGvInuaBp3+thtG2Ze1CgxZqOVWLFv9/71PbpN YSuzPK7t7LmTFhkz+AZRbeXWdj0RmqTFyClEExDCzlZoyxufIoiSUdDNG6SgB4tgBy3/h8r0Vye ir0XIrqVwr+/yOz0V2g== X-Proofpoint-Spam-Info: AW1haW4tMjYwODE4MDA3MyBTYWx0ZWRfX+qdFjnASW5Tp v7ni5Em5+FT6rrNM+penFjlmfbM3ebGtDkaOOmQmNXjyoBpjnlm3dpCIyT3rB405BeIUDaDVTh4 z+Z2ZQIBVeqnFczBfK2r2XbVDqXX/hE= X-Authority-Analysis: v=2.4 cv=XtfK/1F9 c=1 sm=1 tr=0 ts=6a842c79 cx=c_pps a=EVbN6Ke/fEF3bsl7X48z0g==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=EUspDBNiAAAA:8 a=pCBiGHpxg2lVr5E8ZqwA:9 a=QEXdDO2ut3YA:10 a=a_PwQJl-kcHnX1M80qC6:22 X-Proofpoint-ORIG-GUID: pFLI0zYYQgT4s22wCR9MllwAerXbEpHO X-Proofpoint-GUID: pFLI0zYYQgT4s22wCR9MllwAerXbEpHO 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=2026-08-17_04,2026-08-12_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 bulkscore=0 impostorscore=0 spamscore=0 lowpriorityscore=0 phishscore=0 clxscore=1015 suspectscore=0 malwarescore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608180073 On 8/10/26 5:42 PM, Dmitry Baryshkov wrote: > The PHY power-on sequence ends by engaging HSIC mode. With chipidea, > power-on runs before the host is started, and the HSIC connect of an > already-present device is latched at the moment HSIC mode is engaged: > performed before the host runs (and before an onboard hub is taken out > of reset), the connect is lost and the device is never seen. This is > why the APQ8074 dragonboard USB4604 hub never enumerated on mainline > while the vendor kernel - which performs the whole PHY sequence after > usb_add_hcd() - sees it on every boot. > > Keep the calibration setup and the pad mux in power-on, and move the > HSIC mode enable (and the auto-resume disable) into the calibrate op, > which the chipidea host now invokes after the host is up and the > onboard device reset has been released. > > Assisted-by: Claude:claude-fable-5 > Signed-off-by: Dmitry Baryshkov > --- Reviewed-by: Konrad Dybcio Konrad