PCI: rcar-gen4: set ep BAR4 fixed size

On rcar-gen4, the ep BAR4 has a fixed size of 256B. Document this
constraint in the epc features of the platform.

Fixes: e311b38 ("PCI: rcar-gen4: Add endpoint mode support")
Signed-off-by: Jerome Brunet <[email protected]>
Signed-off-by: Manivannan Sadhasivam <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: jbrun3t

drivers/pci/controller/dwc/pcie-rcar-gen4.c

@@ -403,6 +403,7 @@ static const struct pci_epc_features rcar_gen4_pcie_epc_features = {
 	.msix_capable = false,
 	.bar[BAR_1] = { .type = BAR_RESERVED, },
 	.bar[BAR_3] = { .type = BAR_RESERVED, },
+	.bar[BAR_4] = { .type = BAR_FIXED, .fixed_size = 256 },
 	.bar[BAR_5] = { .type = BAR_RESERVED, },
 	.align = SZ_1M,
 };