From: Bin Meng <bmeng.cn@gmail.com>
Date: Thu, 1 Oct 2015 07:35:59 +0000 (-0700)
Subject: pci: Set PCI_COMMAND_IO bit for VGA device
X-Git-Tag: v2016.01-rc1~298^2~55
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=cdf9f085f209ba214178fe749133096721a208a6;p=u-boot

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 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);