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PCI: dwc: Implement .assert_perst() for dwc glue drivers

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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 <krishna.chundru@oss.qualcomm.com>
[bhelgaas: squash dwc host support]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Manivannan Sadhasivam <mani@kernel.org>
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
This commit is contained in:
Krishna Chaitanya Chundru
2025-11-01 09:29:34 +05:30
committed by Bjorn Helgaas
parent 01ba827029
commit 3445d38207
2 changed files with 18 additions and 0 deletions
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9
drivers/pci/controller/dwc/pcie-designware-host.c
View File

@@ -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)

9
drivers/pci/controller/dwc/pcie-designware.h
View File

@@ -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;