[PATCH 13/15] PCI: mvebu: Fix support for PCI_EXP_DEVCTL on emulated bridge

Pali Rohár
2021-11-25T12:49:16Z

Comment in Armada 370 functional specification is misleading.
PCI_EXP_DEVCTL_*RE bits are supported and configures receiving of error
interrupts.

Signed-off-by: Pali Rohár <pali@kernel.org>
Fixes: 1f08673eef12 ("PCI: mvebu: Convert to PCI emulated bridge config space")
Cc: stable@vger.kernel.org
---
drivers/pci/controller/pci-mvebu.c | 11 +----------
1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index 3075ea98c131..c9b736344b56 100644
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -545,9 +545,7 @@ mvebu_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge,
break;

case PCI_EXP_DEVCTL:
- *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL) &
- ~(PCI_EXP_DEVCTL_URRE | PCI_EXP_DEVCTL_FERE |
- PCI_EXP_DEVCTL_NFERE | PCI_EXP_DEVCTL_CERE);
+ *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL);
break;

case PCI_EXP_LNKCAP:
@@ -658,13 +656,6 @@ mvebu_pci_bridge_emul_pcie_conf_write(struct pci_bridge_emul *bridge,

switch (reg) {
case PCI_EXP_DEVCTL:
- /*
- * Armada370 data says these bits must always
- * be zero when in root complex mode.
- */
- new &= ~(PCI_EXP_DEVCTL_URRE | PCI_EXP_DEVCTL_FERE |
- PCI_EXP_DEVCTL_NFERE | PCI_EXP_DEVCTL_CERE);
-
mvebu_writel(port, new, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL);
break;

--
2.20.1