[PATCH v7 4/8] PCI: dwc: Add assert_perst() hook for dwc glue drivers

Krishna Chaitanya Chundru
2025-10-29T11:30:50Z

Add assert_perst() function hook for dwc glue drivers to register with
assert_perst() of pci ops, allowing for better control over the
link initialization and shutdown process.

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>
---
drivers/pci/controller/dwc/pcie-designware.h | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index e995f692a1ecd10130d3be3358827f801811387f..99a02f052e1c8410573ecd44340a9ba4f822e979 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;

--
2.34.1