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Mon, 17 Nov 2025 07:10:51 -0800 (PST) Received: from [192.168.1.102] ([120.60.57.34]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-343e07d2e5esm18476478a91.17.2025.11.17.07.10.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Nov 2025 07:10:50 -0800 (PST) From: Manivannan Sadhasivam X-Google-Original-From: Manivannan Sadhasivam To: Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Rob Herring , Bjorn Helgaas , Maxime Coquelin , Alexandre Torgue , Christian Bruel Cc: linux-pci@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org In-Reply-To: <20251114-perst_ep-v1-1-e7976317a890@foss.st.com> References: <20251114-perst_ep-v1-1-e7976317a890@foss.st.com> Subject: Re: [PATCH] PCI: stm32: Fix LTSSM EP race with start link. Message-Id: <176339224773.8361.12189431111845230002.b4-ty@kernel.org> Date: Mon, 17 Nov 2025 20:40:47 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Mailer: b4 0.14.3 X-Authority-Analysis: v=2.4 cv=AKSYvs3t c=1 sm=1 tr=0 ts=691b3afc cx=c_pps a=vVfyC5vLCtgYJKYeQD43oA==:117 a=SvArCPxluHhT4bP621h3eQ==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=dc-18obONeaZi32LRPcA:9 a=QEXdDO2ut3YA:10 a=rl5im9kqc5Lf4LNbBjHf:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTE3MDEyOSBTYWx0ZWRfX9jRBE/QflPDC acx3xrj79fkXw69EUH0peiO10fpx10jJiUub4S0O3z+zcHOkAh4cK86oBWGoXs9zjwmNvZ4I57I VluMHA0n27ZfQdeJZnV6ms+CdLimtgpCmedbvjTlss+kjlFfkDDRXwRu3htkhYptj9Vl6HfyER5 SI44LAvEXjVmD2uyi9v/2OC0TEaGjpSbvsKSuEKQDPd/piotV9FVh3pXUx7OF70RNWdQ0e5kxUm DoRrhQkJLFjhASUIqZ0JjPV+H+65tD5H6CyxqqihTqaeI3QZxpIVkfs7zQ8Co3V20yrD+7u3KED HXbQqC4lSEWFlnxBuI9N65TqWziqKO7/H+tcCJ9aiiYLhf1rS8cSypLvnQSFi3YXa7z6FXOWkYt l9b+LdzBks8A5CYF9lkhWqGjkQzfFQ== X-Proofpoint-ORIG-GUID: 5e5QDG2eijPU6iX9wXOPl7TgRv94CCKx X-Proofpoint-GUID: 5e5QDG2eijPU6iX9wXOPl7TgRv94CCKx 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=2025-11-17_03,2025-11-13_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=0 phishscore=0 priorityscore=1501 lowpriorityscore=0 impostorscore=0 bulkscore=0 spamscore=0 adultscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511170129 On Fri, 14 Nov 2025 08:45:52 +0100, Christian Bruel wrote: > If the host has deasserted PERST# and started link training before the link > is started on EP side, enabling LTSSM before the endpoint registers are > initialized in the perst_irq handler results in probing incorrect values. > > Thus, wait for the PERST# level-triggered interrupt to start link training > at the end of initialization and cleanup the stm32_pcie_[start stop]_link > functions. > > [...] Applied, thanks! [1/1] PCI: stm32: Fix LTSSM EP race with start link. commit: acca17da9c9f53c0aa05bbdef255213d36dc09db Best regards, -- Manivannan Sadhasivam