From cdf9f085f209ba214178fe749133096721a208a6 Mon Sep 17 00:00:00 2001 From: Bin Meng <bmeng.cn@gmail.com> Date: Thu, 1 Oct 2015 00:35:59 -0700 Subject: [PATCH] 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> --- 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 79f27c744b..0412bf3515 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; @@ -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); -- 2.39.5