From: Krishna Chaitanya Chundru Date: Sat, 1 Nov 2025 03:59:34 +0000 (+0530) Subject: PCI: dwc: Implement .assert_perst() for dwc glue drivers X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=3445d3820770377c3e7dc96875ac0e928e497fd5;p=thirdparty%2Fkernel%2Flinux.git PCI: dwc: Implement .assert_perst() for dwc glue drivers Add .assert_perst() hook for dwc glue drivers to register with assert_perst() of pci ops, allowing for better control over the link initialization and shutdown process. Implement assert_perst() function op for dwc drivers. Signed-off-by: Krishna Chaitanya Chundru [bhelgaas: squash dwc host support] Signed-off-by: Bjorn Helgaas Acked-by: Manivannan Sadhasivam Link: https://patch.msgid.link/20251101-tc9563-v9-3-de3429f7787a@oss.qualcomm.com Link: https://patch.msgid.link/20251101-tc9563-v9-4-de3429f7787a@oss.qualcomm.com --- diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index 20c9333bcb1c4..b56dd1d51fa4f 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -842,10 +842,19 @@ void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn, } EXPORT_SYMBOL_GPL(dw_pcie_own_conf_map_bus); +static int dw_pcie_op_assert_perst(struct pci_bus *bus, bool assert) +{ + struct dw_pcie_rp *pp = bus->sysdata; + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + + return dw_pcie_assert_perst(pci, assert); +} + static struct pci_ops dw_pcie_ops = { .map_bus = dw_pcie_own_conf_map_bus, .read = pci_generic_config_read, .write = pci_generic_config_write, + .assert_perst = dw_pcie_op_assert_perst, }; static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp) diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index e995f692a1ecd..99a02f052e1c8 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -485,6 +485,7 @@ struct dw_pcie_ops { enum dw_pcie_ltssm (*get_ltssm)(struct dw_pcie *pcie); int (*start_link)(struct dw_pcie *pcie); void (*stop_link)(struct dw_pcie *pcie); + int (*assert_perst)(struct dw_pcie *pcie, bool assert); }; struct debugfs_info { @@ -787,6 +788,14 @@ static inline void dw_pcie_stop_link(struct dw_pcie *pci) pci->ops->stop_link(pci); } +static inline int dw_pcie_assert_perst(struct dw_pcie *pci, bool assert) +{ + if (pci->ops && pci->ops->assert_perst) + return pci->ops->assert_perst(pci, assert); + + return 0; +} + static inline enum dw_pcie_ltssm dw_pcie_get_ltssm(struct dw_pcie *pci) { u32 val;