pci: Set PCI_COMMAND_IO bit for VGA device

PCI_COMMAND_IO bit must be set for VGA device as it needs to respond
to legacy VGA IO address.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/pci/pci_auto.c b/drivers/pci/pci_auto.c
index 79f27c7..0412bf3 100644 (file)
--- a/drivers/pci/pci_auto.c
+++ b/drivers/pci/pci_auto.c
@@ -89,6 +89,7 @@ void pciauto_setup_device(struct pci_controller *hose,
        struct pci_region *bar_res;
        int found_mem64 = 0;
 #endif
+       u16 class;
 
        pci_hose_read_config_word(hose, dev, PCI_COMMAND, &cmdstat);
        cmdstat = (cmdstat & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) | PCI_COMMAND_MASTER;
@@ -206,6 +207,11 @@ void pciauto_setup_device(struct pci_controller *hose,
        }
 #endif
 
+       /* PCI_COMMAND_IO must be set for VGA device */
+       pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);
+       if (class == PCI_CLASS_DISPLAY_VGA)
+               cmdstat |= PCI_COMMAND_IO;
+
        pci_hose_write_config_word(hose, dev, PCI_COMMAND, cmdstat);
        pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE,
                CONFIG_SYS_PCI_CACHE_LINE_SIZE);