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PCI: cadence: Fix updating Vendor ID and Subsystem Vendor ID register

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[ Upstream commit e3bca37d15dca118f2ef1f0a068bb6e07846ea20 ]

Commit 1b79c5284439 ("PCI: cadence: Add host driver for Cadence PCIe
controller") in order to update Vendor ID, directly wrote to
PCI_VENDOR_ID register. However 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.

Link: https://lore.kernel.org/r/20200722110317.4744-10-kishon@ti.com
Fixes: 1b79c5284439 ("PCI: cadence: Add host driver for Cadence PCIe controller")
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kishon Vijay Abraham I 2020-07-22 16:33:11 +05:30 committed by Greg Kroah-Hartman
parent 8456017563
commit 16416a1587
1 changed files with 7 additions and 2 deletions
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9
drivers/pci/controller/pcie-cadence-host.c
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@ -102,6 +102,7 @@ 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:
@ -121,8 +122,12 @@ 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);