[PATCH V12 2/5] PCI: add pci_bus_crs_visibility_pending() function to detect CRS response

Sinan Kaya
2017-08-23T04:57:16Z

We need a wrapper function to determine when a particular device is
returning Configuration Request Retry Status (CRS) response. This will only
happen if the root port supports CRS visibility.

Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
---
drivers/pci/pci.h | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 22e0617..7fa583a 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -235,6 +235,10 @@ enum pci_bar_type {
pci_bar_mem64, /* A 64-bit memory BAR */
};

+static inline bool pci_bus_crs_visibility_pending(u32 l)
+{
+ return (l & 0xffff) == 0x0001;
+}
bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *pl,
int crs_timeout);
int pci_setup_device(struct pci_dev *dev);
--
1.9.1