From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bin Meng Date: Thu, 1 Oct 2015 00:35:59 -0700 Subject: [U-Boot] [PATCH 1/6] pci: Set PCI_COMMAND_IO bit for VGA device In-Reply-To: <1443684964-342-1-git-send-email-bmeng.cn@gmail.com> References: <1443684964-342-1-git-send-email-bmeng.cn@gmail.com> Message-ID: <1443684964-342-2-git-send-email-bmeng.cn@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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 --- 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); -- 1.8.2.1