From: Pali Rohár pali@kernel.org
[ Upstream commit d419052bc6c60fa4ab2b5a51d5f1e55a66e2b4ff ]
Commit 43f5c77bcbd2 ("PCI: aardvark: Fix reporting CRS value") started using CRSSVE flag for handling CRS responses.
PCI_EXP_RTCTL_CRSSVE flag is stored only in emulated config space buffer and there is handler for PCI_EXP_RTCTL register. So every read operation from config space automatically clears CRSSVE flag as it is not defined in PCI_EXP_RTCTL read handler.
Fix this by reading current CRSSVE bit flag from emulated space buffer and appending it to PCI_EXP_RTCTL read response.
Link: https://lore.kernel.org/r/20211005180952.6812-5-kabel@kernel.org Fixes: 43f5c77bcbd2 ("PCI: aardvark: Fix reporting CRS value") Signed-off-by: Pali Rohár pali@kernel.org Signed-off-by: Marek Behún kabel@kernel.org Signed-off-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Reviewed-by: Marek Behún kabel@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/controller/pci-aardvark.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c index 589ddb4c50100..b792a779f1059 100644 --- a/drivers/pci/controller/pci-aardvark.c +++ b/drivers/pci/controller/pci-aardvark.c @@ -885,6 +885,7 @@ advk_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge, case PCI_EXP_RTCTL: { u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG); *value = (val & PCIE_MSG_PM_PME_MASK) ? 0 : PCI_EXP_RTCTL_PMEIE; + *value |= le16_to_cpu(bridge->pcie_conf.rootctl) & PCI_EXP_RTCTL_CRSSVE; *value |= PCI_EXP_RTCAP_CRSVIS << 16; return PCI_BRIDGE_EMUL_HANDLED; }