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Wed, 09 Jul 2025 05:39:53 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFK7VBdZMMbsnBq4tAIekTkIsp6YkexavIr8EuGi0wWr9Tw52la/RWx1TJ63OSStOPaGoyV+w== X-Received: by 2002:a05:6a00:2445:b0:736:35d4:f03f with SMTP id d2e1a72fcca58-74ea644856fmr3569718b3a.6.1752064793079; Wed, 09 Jul 2025 05:39:53 -0700 (PDT) Received: from [10.218.37.122] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-74ce429c46asm14970330b3a.129.2025.07.09.05.39.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 09 Jul 2025 05:39:52 -0700 (PDT) Message-ID: <7ed53821-c86a-41f0-bb99-ff43ebedd680@oss.qualcomm.com> Date: Wed, 9 Jul 2025 18:09:48 +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 3/5] bus: mhi: host: pci_generic: Read SUBSYSTEM_VENDOR_ID for VF's to check status To: Vivek.Pernamitta@quicinc.com, Manivannan Sadhasivam Cc: mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Vivek Pernamitta References: <20250703-sriov_vdev_next-20250630-v1-0-87071d1047e3@quicinc.com> <20250703-sriov_vdev_next-20250630-v1-3-87071d1047e3@quicinc.com> Content-Language: en-US From: Krishna Chaitanya Chundru In-Reply-To: <20250703-sriov_vdev_next-20250630-v1-3-87071d1047e3@quicinc.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzA5MDExMyBTYWx0ZWRfXzK8tcma41ElH tFXNPhk7MCZaamkiGOOzE0E0ljOwsYWYG9/JStx608ZBiht/TkxRSeisip2t5rlVB2ZQ3pDisQu Irz37nXMH4W60+N8Fp5KMFU/C52bJUBl+lLBsqliMC85zRtRwPUGkqTKhoWaVtfBYHJjNpWvikh juVnfXILnjy39aD3yNZxExernpES3nhw+cAjdA0VJg+eeWumdUKKzKK2KD1c7mW6z1Ob6mzNR8q kmjy+yhr9Tb54uva+1x6/C+uALlg+IhiHSl02kWzaal9MoGwmUpdAzIggHc5gsIBvXpUBLE2MB/ nUwZaY0kEhwUZz97Pbynyzw5iXh7W+GZD/mN/gsfreg01OLK+M84BFszIEsGro2lEiIlKPc5QP7 MlmgH1n4DQiJpvrWvAkohgg/CtH2/f4z8l4Xlk7Q/rZ3K91OZu4oZeollWeA18QfV59iMYOr X-Authority-Analysis: v=2.4 cv=QM1oRhLL c=1 sm=1 tr=0 ts=686e631a cx=c_pps a=mDZGXZTwRPZaeRUbqKGCBw==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=Wb1JkmetP80A:10 a=COk6AnOGAAAA:8 a=EUspDBNiAAAA:8 a=zv_5qE797hUBxoToDSIA:9 a=QEXdDO2ut3YA:10 a=zc0IvFSfCIW2DFIPzwfm:22 a=TjNXssC_j7lpFel5tvFf:22 X-Proofpoint-ORIG-GUID: aexjH024te0UQonj1XrMJxZGmR0p51xz X-Proofpoint-GUID: aexjH024te0UQonj1XrMJxZGmR0p51xz X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.7,FMLib:17.12.80.40 definitions=2025-07-09_02,2025-07-08_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 impostorscore=0 malwarescore=0 suspectscore=0 lowpriorityscore=0 priorityscore=1501 bulkscore=0 adultscore=0 mlxscore=0 phishscore=0 mlxlogscore=999 spamscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2507090113 On 7/3/2025 8:39 PM, Vivek.Pernamitta@quicinc.com wrote: > From: Vivek Pernamitta > > In SRIOV enabled devices, the VF DEVICE/VENDOR ID register returns FFFFh > when read (PCIe SRIOV spec-3.4.1.1). Therefore, read the PCIe > SUBSYSTEM_VENDOR_ID to check if the device is active. > Reviewed-by: Krishna Chaitanya Chundru - Krishna Chaitanya. > Signed-off-by: Vivek Pernamitta > --- > drivers/bus/mhi/host/pci_generic.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c > index 22de02c26ceb946fb618d962ac8882d2db1be6b4..938f37d306a18b9a47f302df85697f837c225f0d 100644 > --- a/drivers/bus/mhi/host/pci_generic.c > +++ b/drivers/bus/mhi/host/pci_generic.c > @@ -1025,8 +1025,10 @@ static bool mhi_pci_is_alive(struct mhi_controller *mhi_cntrl) > struct pci_dev *pdev = to_pci_dev(mhi_cntrl->cntrl_dev); > u16 vendor = 0; > > - if (pci_read_config_word(pdev, PCI_VENDOR_ID, &vendor)) > - return false; > + if (pdev->is_virtfn) > + pci_read_config_word(pdev, PCI_SUBSYSTEM_VENDOR_ID, &vendor); > + else > + pci_read_config_word(pdev, PCI_VENDOR_ID, &vendor); > > if (vendor == (u16) ~0 || vendor == 0) > return false; >