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
--- a/drivers/pci/pci_auto.c
+++ b/drivers/pci/pci_auto.c
@@ -89,6 +89,7 @@
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 @@
}
#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);