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Wed, 29 Oct 2025 18:57:02 +0100 (CET) Received: by jupiter.universe (Postfix, from userid 1000) id 2622C480067; Wed, 29 Oct 2025 18:57:02 +0100 (CET) From: Sebastian Reichel Date: Wed, 29 Oct 2025 18:56:48 +0100 Subject: [PATCH v4 9/9] PCI: dwc: support missing PCIe device on resume 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: quoted-printable Message-Id: <20251029-rockchip-pcie-system-suspend-v4-9-ce2e1b0692d2@collabora.com> References: <20251029-rockchip-pcie-system-suspend-v4-0-ce2e1b0692d2@collabora.com> In-Reply-To: <20251029-rockchip-pcie-system-suspend-v4-0-ce2e1b0692d2@collabora.com> To: Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Manivannan Sadhasivam , Rob Herring , Bjorn Helgaas , Heiko Stuebner , Philipp Zabel , Jingoo Han , Shawn Lin Cc: linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, kernel@collabora.com, Sebastian Reichel X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; 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a=openpgp; fpr=EF660D07463F8B726A795413D8EED7F3C83BFA9A When dw_pcie_resume_noirq() is called for a PCIe root complex for a PCIe slot with no device plugged on Rockchip RK3576, dw_pcie_wait_for_link() will return -ETIMEDOUT. During probe time this does not happen, since the platform sets 'use_linkup_irq'. This adds the same logic from dw_pcie_host_init() to the PM resume function to avoid the problem. Signed-off-by: Sebastian Reichel --- drivers/pci/controller/dwc/pcie-designware-host.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pc= i/controller/dwc/pcie-designware-host.c index e92513c5bda5..f25f1c136900 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -1215,9 +1215,16 @@ int dw_pcie_resume_noirq(struct dw_pcie *pci) if (ret) return ret; =20 - ret =3D dw_pcie_wait_for_link(pci); - if (ret) - return ret; + /* + * Note: Skip the link up delay only when a Link Up IRQ is present. + * If there is no Link Up IRQ, we should not bypass the delay + * because that would require users to manually rescan for devices. + */ + if (!pci->pp.use_linkup_irq) { + ret =3D dw_pcie_wait_for_link(pci); + if (ret) + return ret; + } =20 return ret; } --=20 2.51.0