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pci: Set PCI_COMMAND_IO bit for VGA device

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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>
This commit is contained in:
Bin Meng 2015-10-01 00:35:59 -07:00 • committed by Simon Glass
parent 5dbcf3a0f9
commit cdf9f085f2
1 changed files with 6 additions and 0 deletions
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6
drivers/pci/pci_auto.c
View file

@ -89,6 +89,7 @@ void pciauto_setup_device(struct pci_controller *hose,
struct pci_region *bar_res; struct pci_region *bar_res;
int found_mem64 = 0; int found_mem64 = 0;
#endif #endif
u16 class;
pci_hose_read_config_word(hose, dev, PCI_COMMAND, &cmdstat); pci_hose_read_config_word(hose, dev, PCI_COMMAND, &cmdstat);
cmdstat = (cmdstat & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) | PCI_COMMAND_MASTER; cmdstat = (cmdstat & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) | PCI_COMMAND_MASTER;
@ -206,6 +207,11 @@ void pciauto_setup_device(struct pci_controller *hose,
} }
#endif #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_word(hose, dev, PCI_COMMAND, cmdstat);
pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE, pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE,
CONFIG_SYS_PCI_CACHE_LINE_SIZE); CONFIG_SYS_PCI_CACHE_LINE_SIZE);