4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Alan Douglas <adouglas@xxxxxxxxxxx>
[ Upstream commit 0652d4b6b56f73c81abbdbc7e26f772cb2dfe370 ]
The IRQ physical address is allocated from region 0, rather than
the highest region. Update the driver to reserve this region in
the bitmap and to use region 0 for all types of interrupt.
This corrects a problem which prevents the interrupt being
signalled correctly if using the first address in the AXI region,
since an offset of zero will always be mapped to region 0.
Fixes: 37dddf14f1ae ("PCI: cadence: Add EndPoint Controller driver for Cadence PCIe controller")
Signed-off-by: Alan Douglas <adouglas@xxxxxxxxxxx>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/pci/controller/pcie-cadence-ep.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
--- a/drivers/pci/controller/pcie-cadence-ep.c
+++ b/drivers/pci/controller/pcie-cadence-ep.c
@@ -258,7 +258,6 @@ static void cdns_pcie_ep_assert_intx(str
u8 intx, bool is_asserted)
{
struct cdns_pcie *pcie = &ep->pcie;
- u32 r = ep->max_regions - 1;
u32 offset;
u16 status;
u8 msg_code;
@@ -268,8 +267,8 @@ static void cdns_pcie_ep_assert_intx(str
/* Set the outbound region if needed. */
if (unlikely(ep->irq_pci_addr != CDNS_PCIE_EP_IRQ_PCI_ADDR_LEGACY ||
ep->irq_pci_fn != fn)) {
- /* Last region was reserved for IRQ writes. */
- cdns_pcie_set_outbound_region_for_normal_msg(pcie, fn, r,
+ /* First region was reserved for IRQ writes. */
+ cdns_pcie_set_outbound_region_for_normal_msg(pcie, fn, 0,
ep->irq_phys_addr);
ep->irq_pci_addr = CDNS_PCIE_EP_IRQ_PCI_ADDR_LEGACY;
ep->irq_pci_fn = fn;
@@ -347,8 +346,8 @@ static int cdns_pcie_ep_send_msi_irq(str
/* Set the outbound region if needed. */
if (unlikely(ep->irq_pci_addr != (pci_addr & ~pci_addr_mask) ||
ep->irq_pci_fn != fn)) {
- /* Last region was reserved for IRQ writes. */
- cdns_pcie_set_outbound_region(pcie, fn, ep->max_regions - 1,
+ /* First region was reserved for IRQ writes. */
+ cdns_pcie_set_outbound_region(pcie, fn, 0,
false,
ep->irq_phys_addr,
pci_addr & ~pci_addr_mask,
@@ -517,6 +516,8 @@ static int cdns_pcie_ep_probe(struct pla
goto free_epc_mem;
}
ep->irq_pci_addr = CDNS_PCIE_EP_IRQ_PCI_ADDR_NONE;
+ /* Reserve region 0 for IRQs */
+ set_bit(0, &ep->ob_region_map);
return 0;
