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dm: pci: Enable VGA address forwarding on bridges
To support graphics card behind a PCI bridge, the bridge control register (offset 0x3e) in the configuration space must turn on VGA address forwarding. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Acked-by: Simon Glass <sjg@chromium.org>
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@ -364,9 +364,23 @@ int dm_pci_read_config32(struct udevice *dev, int offset, u32 *valuep)
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return 0;
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return 0;
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}
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}
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static void set_vga_bridge_bits(struct udevice *dev)
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{
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struct udevice *parent = dev->parent;
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u16 bc;
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while (parent->seq != 0) {
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dm_pci_read_config16(parent, PCI_BRIDGE_CONTROL, &bc);
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bc |= PCI_BRIDGE_CTL_VGA;
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dm_pci_write_config16(parent, PCI_BRIDGE_CONTROL, bc);
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parent = parent->parent;
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}
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}
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int pci_auto_config_devices(struct udevice *bus)
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int pci_auto_config_devices(struct udevice *bus)
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{
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{
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struct pci_controller *hose = bus->uclass_priv;
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struct pci_controller *hose = bus->uclass_priv;
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struct pci_child_platdata *pplat;
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unsigned int sub_bus;
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unsigned int sub_bus;
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struct udevice *dev;
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struct udevice *dev;
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int ret;
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int ret;
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@ -386,6 +400,10 @@ int pci_auto_config_devices(struct udevice *bus)
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return ret;
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return ret;
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max_bus = ret;
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max_bus = ret;
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sub_bus = max(sub_bus, max_bus);
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sub_bus = max(sub_bus, max_bus);
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pplat = dev_get_parent_platdata(dev);
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if (pplat->class == (PCI_CLASS_DISPLAY_VGA << 8))
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set_vga_bridge_bits(dev);
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}
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}
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debug("%s: done\n", __func__);
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debug("%s: done\n", __func__);
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