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Wed, 07 Jan 2026 02:58:28 -0800 (PST) X-Google-Smtp-Source: AGHT+IEbNqpZuV6mAp6uDnE3kM7fbVgC6I+1Vf4XpkCqEkA9coF18+F5L03OETFULxVPU2jppSWDpQ== X-Received: by 2002:a17:903:32c9:b0:296:2aed:4fab with SMTP id d9443c01a7336-2a3ee43595bmr21024795ad.23.1767783507835; Wed, 07 Jan 2026 02:58:27 -0800 (PST) Received: from [10.218.32.171] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2a3e3cc8d76sm47711725ad.84.2026.01.07.02.58.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 07 Jan 2026 02:58:27 -0800 (PST) Message-ID: <741df2ea-03fd-4af2-9a98-20d68658edcb@oss.qualcomm.com> Date: Wed, 7 Jan 2026 16:28:22 +0530 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 v1] serial: qcom_geni: Fix BT failure regression on RB2 platform To: Konrad Dybcio , 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> <36d8fb98-562a-43dc-8b47-b4f6d29475f1@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=XpL3+FF9 c=1 sm=1 tr=0 ts=695e3c55 cx=c_pps a=Oh5Dbbf/trHjhBongsHeRQ==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=fCEnOBaRacVBP-F0Y58A:9 a=QEXdDO2ut3YA:10 a=_Vgx9l1VpLgwpw_dHYaR:22 X-Proofpoint-ORIG-GUID: pIoSflU6xSw-9g6huWLI457DSXCFB5GD X-Proofpoint-GUID: pIoSflU6xSw-9g6huWLI457DSXCFB5GD X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTA3MDA4OSBTYWx0ZWRfX8ZoO6I865GPj HPvoM2xIOtt/S7rD8Y0egwe90HfdV3sZTu75IVeHlHrKmw00B0UlVkrwNlE415sOI56IHylykva 0tEYkmd3WnxdKC6Cf08nLe2N4Skf0n/JEJ3DPGHPO/xseIqaq+jdFoTgkaDDFfULnv6fEzg4ULY vRIFX0fTgvgY7FX07YCFuuSnOyfSHy1DMZNHjPL03/cN2QR1cFr8OCFEcms60gX9qDSuSSuCXi4 xadXneHnxpFTsQI4xrOKSNdhsqskXUmgJtuPRadr+C9KOZykAX+5bX8Dl6shRyXMq+RgRofhQ1I C9fYqYoyfpBZXQ2WjozsjZEosrpfJCyksXiQEhS4RqpR5IZtQ0OQeeXIPkNRIFy1Cw8/178+9Iv taeGXz67CfRrsFaBY76CqICsWKF1icZ0mujfFmMq10K+xyk8tF2pDFCtcbcwX4s7lovTGHMI5xd b1Bd2AzyhN+pxiGP+Ow== 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=2026-01-07_01,2026-01-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 clxscore=1015 suspectscore=0 priorityscore=1501 adultscore=0 spamscore=0 impostorscore=0 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2512120000 definitions=main-2601070089 Hi Konrad, On 1/7/2026 4:16 PM, Konrad Dybcio wrote: > On 1/7/26 10:24 AM, Praveen Talari wrote: >> Hi >> >> On 1/7/2026 12:52 PM, Dmitry Baryshkov wrote: >>> On Wed, 7 Jan 2026 at 09:06, Praveen Talari >>> wrote: >>>> >>>> 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.. >>> >>> Altered how? >> >> During the runtime resume of devices, GPIOs are configured to QUP mode. However, when registering the wakeup IRQ using dev_pm_set_dedicated_wake_irq(), these GPIOs are reset back to FUNC mode, which impacts the RX GPIO and leads to Bluetooth failures > > "QUP mode" and "FUNC mode" are tough to swallow even for an insider.. How > about: > > "qup_x" and "gpio" pinmux functions Yes, you are right. I am talking about "qup_x" and "gpio" pinmux functions Thanks, Praveen Talari > > ? > > Konrad