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 ---
drivers/pci/pci_auto.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/pci/pci_auto.c b/drivers/pci/pci_auto.c index 41d5447..e2c239e 100644 --- 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; @@ -205,6 +206,11 @@ 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);