[PATCH] PCI: dwc: rcar-gen4: Use 4K EPC BAR alignment

[Koichiro Den]

R-Car S4 Series (R8A779F[4-7]*) uses a 4K minimum iATU region size
(CX_ATU_MIN_REGION_SIZE = 4K) as per R19UH0161EJ0130 Rev.1.30.

Update the advertised alignment to 4K, as described in
commit 2a9a801620ef ("PCI: endpoint: Add support to specify alignment
for buffers allocated to BARs").

With the previous 1MB alignment requirement, iATU programming for BAR4
on this platform often cannot be performed, since a 1MB-aligned target
address may fall outside the tiny 256B BAR4 window.

Signed-off-by: Koichiro Den <den@xxxxxxxxxxxxx>
---
 drivers/pci/controller/dwc/pcie-rcar-gen4.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
index 3d4a889e38cc..396ef9432299 100644
--- a/drivers/pci/controller/dwc/pcie-rcar-gen4.c
+++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
@@ -428,7 +428,7 @@ static const struct pci_epc_features rcar_gen4_pcie_epc_features = {
 	.bar[BAR_3] = { .type = BAR_RESERVED, },
 	.bar[BAR_4] = { .type = BAR_FIXED, .fixed_size = 256 },
 	.bar[BAR_5] = { .type = BAR_RESERVED, },
-	.align = SZ_1M,
+	.align = SZ_4K,
 };
 
 static const struct pci_epc_features*
-- 
2.51.0