x86: qemu: Turn on PCIe ECAM address range decoding on Q35

Turn on PCIe ECAM address range decoding on Q35.
Signed-off-by: NBin Meng <bmeng.cn@gmail.com>
Acked-by: NSimon Glass <sjg@chromium.org>

arch/x86/cpu/qemu/pci.c

@@ -90,6 +90,10 @@ int board_pci_post_scan(struct pci_controller *hose)
 		xbcs = x86_pci_read_config16(PIIX_ISA, XBCS);
 		xbcs |= APIC_EN;
 		x86_pci_write_config16(PIIX_ISA, XBCS, xbcs);
+	} else {
+		/* Configure PCIe ECAM base address */
+		x86_pci_write_config32(PCI_BDF(0, 0, 0), PCIEX_BAR,
+				       CONFIG_PCIE_ECAM_BASE | BAR_EN);
 	}
 
 	/*

arch/x86/include/asm/arch-qemu/qemu.h

@@ -22,6 +22,10 @@
 #define IDE1_TIM		0x42
 #define IDE_DECODE_EN		(1 << 15)
 
+/* PCIe ECAM Base Address Register */
+#define PCIEX_BAR		0x60
+#define BAR_EN			(1 << 0)
+
 /* I/O Ports */
 #define CMOS_ADDR_PORT		0x70
 #define CMOS_DATA_PORT		0x71