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[v2,5/8] PCI: Add new start_link() & stop_link function ops

Message ID 20240803-qps615-v2-5-9560b7c71369@quicinc.com (mailing list archive)
State New
Delegated to: Manivannan Sadhasivam
Headers show
Series PCI: Enable Power and configure the QPS615 PCIe switch | expand

Commit Message

Krishna Chaitanya Chundru Aug. 3, 2024, 3:22 a.m. UTC 
Certain devices like QPS615 which uses PCI pwrctl framework
needs to configure the device before PCI link is up.

If the controller driver already enables link training as part of
its probe, after the device is powered on, controller and device
participates in the link training and link can come up immediately
and maynot have time to configure the device.

So we need to stop the link training by using stop_link() and enable
them back after device is configured by using start_link().

Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
---
 include/linux/pci.h | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 4cf89a4b4cbc..0791d74951e9 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -802,6 +802,8 @@  struct pci_ops {
 	void __iomem *(*map_bus)(struct pci_bus *bus, unsigned int devfn, int where);
 	int (*read)(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val);
 	int (*write)(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val);
+	int (*start_link)(struct pci_bus *bus);
+	void (*stop_link)(struct pci_bus *bus);
 };
 
 /*