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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b8dbf183cbesm117532566b.38.2026.01.28.04.31.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 28 Jan 2026 04:31:46 -0800 (PST) Message-ID: <30e971d3-90ea-4f08-bc5b-ff25030130b6@oss.qualcomm.com> Date: Wed, 28 Jan 2026 13:31:44 +0100 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] PCI: qcom: Prevent GDSC power down on suspend To: Krishna Chaitanya Chundru , Manivannan Sadhasivam , Lorenzo Pieralisi , =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= , Rob Herring , Bjorn Helgaas , Stanimir Varbanov Cc: linux-arm-msm@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20260128-genpd_fix-v1-1-cd45a249d12f@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260128-genpd_fix-v1-1-cd45a249d12f@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=YNWSCBGx c=1 sm=1 tr=0 ts=697a01b5 cx=c_pps a=HLyN3IcIa5EE8TELMZ618Q==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=jU-KX4cHS3eJyRZ3RZEA:9 a=QEXdDO2ut3YA:10 a=ZXulRonScM0A:10 a=bTQJ7kPSJx9SKPbeHEYW:22 X-Proofpoint-ORIG-GUID: SFuKNUKiMyEf8lrnMdrwOh5eGxdR1MSk X-Proofpoint-GUID: SFuKNUKiMyEf8lrnMdrwOh5eGxdR1MSk X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTI4MDEwMiBTYWx0ZWRfX9mHbzIY7pukD ea1/7pzM7mDlH4JUAlvU2DUb7umz93NcWijhcR6cEPm17pxUpHqs6o0F84pNgI9itn31fh/absk oavjrP1F6hSPorp7WCJfIEVMaNMtPUJu7a+VH38lOGIQvoAkpbF8+0qxmH8NOw4tC6G3tJTPbvs TT/HWmRmP8A1AeZDodWMKzIiWYC4I0n4kSwshDFhspNx14cJY705AEpw9DxgT1oyP6DSHtd7fjM 2PdIpC94tWqkxDEYM4hlmVeUVK7w6JaN8b0vSgCRYsK47NXsp+GdavlIxKFVu5CBcbQrep2g0Tc NLYRx+f5do2+bTaG/wB+JIJeatNv9wLGRHY55F5ZTVeN1PsuBHu4PIVRF8CDnl32F6yKrTpJp+y MpVnh4uTuE1zFvZxyKOUYnWaf/j3oNV+Hov8O1WnT7xEvcnU9PW38addWOtFd/4npLO4xm+zN20 24+nr3s+9E6cUyGGuoQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-01-28_02,2026-01-28_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 phishscore=0 suspectscore=0 lowpriorityscore=0 adultscore=0 priorityscore=1501 spamscore=0 impostorscore=0 malwarescore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2601280102 On 1/28/26 1:22 PM, Krishna Chaitanya Chundru wrote: > Currently, the driver expects the devices to remain in D0 across system > suspend, but the genpd framework may still power down the associated > GDSC during suspend. When that happens, the PCIe link goes down and > cannot be recovered on resume. > > Prevent genpd from turning off the PCIe GDSC by using > dev_pm_genpd_rpm_always_on() so that the power domain stays on while > the controller is suspended. This preserves the link state across > suspend/resume and avoids unrecoverable link failures. > > Fixes: 82a823833f4e ("PCI: qcom: Add Qualcomm PCIe controller driver") > Cc: stable@vger.kernel.org > Signed-off-by: Krishna Chaitanya Chundru > --- How does this play along with your D3Cold series? Is this patch supposed to be applied first? Konrad