diff options
| author | Pali Rohár <pali@kernel.org> | 2021-11-25 15:46:05 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-03-08 21:12:36 +0300 |
| commit | e7c433270307f6eccade1470df3aaa6b252077e1 (patch) | |
| tree | fbdc25b43be84d739dac7ab67b4f808bdfebf2ab /drivers/pci | |
| parent | a24745673304e4561391f345a1d98230967fb3ea (diff) | |
| download | linux-e7c433270307f6eccade1470df3aaa6b252077e1.tar.xz | |
PCI: mvebu: Fix support for DEVCAP2, DEVCTL2 and LNKCTL2 registers on emulated bridge
[ Upstream commit 4ab34548c55fbbb3898306a47dfaccd4860e1ccb ]
Armada XP and new hardware supports access to DEVCAP2, DEVCTL2 and LNKCTL2
configuration registers of PCIe core via PCIE_CAP_PCIEXP. So export them
via emulated software root bridge.
Pre-XP hardware does not support these registers and returns zeros.
Link: https://lore.kernel.org/r/20211125124605.25915-16-pali@kernel.org
Fixes: 1f08673eef12 ("PCI: mvebu: Convert to PCI emulated bridge config space")
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/controller/pci-mvebu.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c index b690768d5a41..357e9a293edf 100644 --- a/drivers/pci/controller/pci-mvebu.c +++ b/drivers/pci/controller/pci-mvebu.c @@ -524,6 +524,18 @@ mvebu_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge, *value = mvebu_readl(port, PCIE_RC_RTSTA); break; + case PCI_EXP_DEVCAP2: + *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCAP2); + break; + + case PCI_EXP_DEVCTL2: + *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL2); + break; + + case PCI_EXP_LNKCTL2: + *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL2); + break; + default: return PCI_BRIDGE_EMUL_NOT_HANDLED; } @@ -615,6 +627,17 @@ mvebu_pci_bridge_emul_pcie_conf_write(struct pci_bridge_emul *bridge, if (new & PCI_EXP_RTSTA_PME) mvebu_writel(port, ~PCIE_INT_PM_PME, PCIE_INT_CAUSE_OFF); break; + + case PCI_EXP_DEVCTL2: + mvebu_writel(port, new, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL2); + break; + + case PCI_EXP_LNKCTL2: + mvebu_writel(port, new, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL2); + break; + + default: + break; } } |