This patch is the third step of the rework: On X86 and IA64 platform,
update default VGA device if the new found device owns the firmware
framebuffer.
Signed-off-by: Huacai Chen <chenhua...@loongson.cn>
---
drivers/pci/vgaarb.c | 45 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c
index 02b68810273a..c768365138b6 100644
--- a/drivers/pci/vgaarb.c
+++ b/drivers/pci/vgaarb.c
@@ -584,6 +584,14 @@ static void vga_arb_update_default_device(struct
vga_device *vgadev)
struct pci_dev *pdev = vgadev->pdev;
struct device *dev = &pdev->dev;
struct vga_device *vgadev_default;
+#if defined(CONFIG_X86) || defined(CONFIG_IA64)
+ int i;
+ unsigned long flags;
+ u64 base = screen_info.lfb_base;
+ u64 size = screen_info.lfb_size;
+ u64 limit;
+ resource_size_t start, end;
+#endif
/*
* If we don't have a default VGA device yet, and this device owns
@@ -610,6 +618,43 @@ static void vga_arb_update_default_device(struct
vga_device *vgadev)
vgaarb_info(dev, "overriding boot VGA device\n");
vga_set_default_device(pdev);
}
+
+#if defined(CONFIG_X86) || defined(CONFIG_IA64)
+ if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
+ base |= (u64)screen_info.ext_lfb_base << 32;
+
+ limit = base + size;
+
+ /*
+ * Override vga_arbiter_add_pci_device()'s I/O based detection
+ * as it may take the wrong device (e.g. on Apple system under
+ * EFI).
+ *
+ * Select the device owning the boot framebuffer if there is
+ * one.
+ */
+
+ /* Does firmware framebuffer belong to us? */
+ for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+ flags = pci_resource_flags(vgadev->pdev, i);
+
+ if ((flags & IORESOURCE_MEM) == 0)
+ continue;
+
+ start = pci_resource_start(vgadev->pdev, i);
+ end = pci_resource_end(vgadev->pdev, i);
+
+ if (!start || !end)
+ continue;
+
+ if (base < start || limit >= end)
+ continue;
+
+ if (vgadev->pdev != vga_default_device())
+ vgaarb_info(dev, "overriding boot device\n");
+ vga_set_default_device(vgadev->pdev);
+ }
+#endif
}
/*
--
2.27.0
