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Tue, 06 Jan 2026 23:06:10 -0800 (PST) X-Google-Smtp-Source: AGHT+IFkK0TXEy469X4Lki1iNUimc7BNa27ftbZY5C46XH2Q4FBkpYXMwIFOrQN37CYLCqgeGesV2w== X-Received: by 2002:a05:6a20:6a05:b0:35d:3f07:ba34 with SMTP id adf61e73a8af0-3898f8f4860mr1473799637.31.1767769569427; Tue, 06 Jan 2026 23:06:09 -0800 (PST) Received: from [10.218.32.171] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c4cc8d2932bsm4332346a12.21.2026.01.06.23.06.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 06 Jan 2026 23:06:09 -0800 (PST) Message-ID: Date: Wed, 7 Jan 2026 12:36:03 +0530 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1] serial: qcom_geni: Fix BT failure regression on RB2 platform To: Dmitry Baryshkov Cc: Greg Kroah-Hartman , Jiri Slaby , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, bryan.odonoghue@linaro.org, andersson@kernel.org, psodagud@quicinc.com, djaggi@quicinc.com, quic_msavaliy@quicinc.com, quic_vtanuku@quicinc.com, quic_arandive@quicinc.com, quic_shazhuss@quicinc.com, quic_cchiluve@quicinc.com References: <20260107064834.1006428-1-praveen.talari@oss.qualcomm.com> Content-Language: en-US From: Praveen Talari In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=MNptWcZl c=1 sm=1 tr=0 ts=695e05e2 cx=c_pps a=oF/VQ+ItUULfLr/lQ2/icg==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=4yKbRbB3D-Nyn2zg6usA:9 a=QEXdDO2ut3YA:10 a=3WC7DwWrALyhR5TkjVHa:22 X-Proofpoint-ORIG-GUID: QypNnLq8lt6S5J9VKhUp6KbbOz9APW1S X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTA3MDA1NiBTYWx0ZWRfX5U/3KW078RN5 XtDt8fX02UnZjIrjOuPhnMkvHoLrrmFND0Eo6EYFeamgu+naHzVTa38etFS/qbcl7ckTaNwC/D2 bawIYmGRUtOwoMu+TP/CpmnvAaXDhOFWFZm+Mv0EdnyYkDGGdLkq0h1QQWbBVKoh+FvTgYB1ved bar6JOxV88r6AqZ1ztt/7WtFiZQOoUg068O9/alpUreUJe3yHsil6nuV0c9gqnEOy+GMRkOM38w yZGv+6++B/vIE61B8FS+oy5anCcxOBC4LfzxBQc+6F7R0ckbP9mTdI5cplJc6KqCbvci5/xnkWz TnJeVGvQCukaQIMXDINfqSAvlY/ueZ4RB8WAyc4+48lozOkcfn9osXATPbGqZ0bPPvb4RODj7IY wLNtI4CD8iPs9goybA9cV5F63rr0EqUzlK3xNCelj8HLYZv6CHGe2XmVzxoXlJHFloT47NUenIj KVHWrh+5vkRfVUzUvGg== X-Proofpoint-GUID: QypNnLq8lt6S5J9VKhUp6KbbOz9APW1S X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2026-01-06_03,2026-01-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 lowpriorityscore=0 impostorscore=0 malwarescore=0 adultscore=0 clxscore=1015 bulkscore=0 phishscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2512120000 definitions=main-2601070056 Hi Dmistry, On 1/7/2026 12:24 PM, Dmitry Baryshkov wrote: > On Wed, 7 Jan 2026 at 08:48, Praveen Talari > wrote: >> >> A regression in linux-next causes Bluetooth functionality to fail during > > linux-next is an ephemeral thing. Please reference the exact commit. > >> bootup on the RB2 platform, preventing proper BT initialization. However, >> BT works correctly after bootup completes. >> >> The issue occurs when runtime PM is enabled and uart_add_one_port() is >> called before wakeup IRQ setup. The uart_add_one_port() call activates the >> device through runtime PM, which configures GPIOs to their default state. >> When wakeup IRQ registration happens afterward, it conflicts with these >> GPIO settings, causing state corruption that breaks Bluetooth >> functionality. > > How does it "conflict with GPIO settings", what is "state corruption"? I mean the issue occurs because the GPIO state is being altered during the wakeup source registration process.. Thanks, Praveen Talari > > >> >> Fix this by moving runtime PM enablement and uart_add_one_port() after >> wakeup IRQ registration, ensuring proper initialization order. >> >> Reported-by: Dmitry Baryshkov >> Closes: >> https://lore.kernel.org/all/20251110101043.2108414-4-praveen.talari@oss.qualcomm.com/ >> Fixes: 10904d725f6e ("serial: qcom-geni: Enable PM runtime for serial driver") >> Signed-off-by: Praveen Talari >> --- >> drivers/tty/serial/qcom_geni_serial.c | 12 ++++++------ >> 1 file changed, 6 insertions(+), 6 deletions(-) >> > > Tested-by: Dmitry Baryshkov > >