[PATCH v2 4/5] PCI: keystone: Add quirk to mark AM654 RC BAR flag as IORESOURCE_UNSET
From: Kishon Vijay Abraham I <hidden>
Date: 2021-11-26 08:33:55
Also in:
linux-pci, lkml
Subsystem:
pci native host bridge and endpoint drivers, pci subsystem, the rest · Maintainers:
Lorenzo Pieralisi, Krzysztof Wilczyński, Manivannan Sadhasivam, Bjorn Helgaas, Linus Torvalds
AM654 RootComplex has a hard coded 64 bit BAR of size 1MB and also has both MSI and MSI-X capability in it's config space. If PCIEPORTBUS is enabled, it tries to configure MSI-X and msix_mask_all() adds about 10 Second boot up delay when it tries to write to undefined location. Add quirk to mark AM654 RC BAR flag as IORESOURCE_UNSET so that msix_map_region() returns NULL for Root Complex and avoid un-desirable writes to MSI-X table. Signed-off-by: Kishon Vijay Abraham I <redacted> --- drivers/pci/controller/dwc/pci-keystone.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index 52d20fe17ee9..73e6626a0d8f 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c@@ -557,8 +557,14 @@ static void ks_pcie_quirk(struct pci_dev *dev) { 0, }, }; - if (pci_is_root_bus(bus)) + if (pci_is_root_bus(bus)) { bridge = dev; + if (pci_match_id(am6_pci_devids, bridge)) { + struct resource *r = &dev->resource[0]; + + r->flags |= IORESOURCE_UNSET; + } + } /* look for the host bridge */ while (!pci_is_root_bus(bus)) {
--
2.17.1