[RFC PATCH 13/30] PCI: cadence: Use local management register to configure Vendor ID
From: Kishon Vijay Abraham I <hidden>
Date: 2019-06-04 13:18:48
Also in:
linux-devicetree, linux-omap, linux-pci, linux-rockchip, lkml
Subsystem:
pci native host bridge and endpoint drivers, pci subsystem, the rest · Maintainers:
Lorenzo Pieralisi, Krzysztof Wilczyński, Manivannan Sadhasivam, Bjorn Helgaas, Linus Torvalds
PCI_VENDOR_ID in root port configuration space is read-only register and writing to it will have no effect. Use local management register to configure Vendor ID and Subsystem Vendor ID. Signed-off-by: Kishon Vijay Abraham I <redacted> --- drivers/pci/controller/pcie-cadence-host.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/controller/pcie-cadence-host.c b/drivers/pci/controller/pcie-cadence-host.c
index 14a54f6a11de..dcecf47805ad 100644
--- a/drivers/pci/controller/pcie-cadence-host.c
+++ b/drivers/pci/controller/pcie-cadence-host.c@@ -148,6 +148,7 @@ static int cdns_pcie_host_init_root_port(struct cdns_pcie_rc *rc) { struct cdns_pcie *pcie = &rc->pcie; u32 value, ctrl; + u32 id; /* * Set the root complex BAR configuration register:
@@ -167,8 +168,12 @@ static int cdns_pcie_host_init_root_port(struct cdns_pcie_rc *rc) cdns_pcie_writel(pcie, CDNS_PCIE_LM_RC_BAR_CFG, value); /* Set root port configuration space */ - if (rc->vendor_id != 0xffff) - cdns_pcie_rp_writew(pcie, PCI_VENDOR_ID, rc->vendor_id); + if (rc->vendor_id != 0xffff) { + id = CDNS_PCIE_LM_ID_VENDOR(rc->vendor_id) | + CDNS_PCIE_LM_ID_SUBSYS(rc->vendor_id); + cdns_pcie_writel(pcie, CDNS_PCIE_LM_ID, id); + } + if (rc->device_id != 0xffff) cdns_pcie_rp_writew(pcie, PCI_DEVICE_ID, rc->device_id);
--
2.17.1
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