[PATCH V6 03/12] PCI/VGA: Split out vga_arb_update_default_device()

[Huacai Chen]

This patch is the first step of the rework: If there's no default VGA
device, and we find a VGA device that owns the legacy VGA resources, we
make that device the default. Split this logic out from vga_arbiter_add_
pci_device() into a new function, vga_arb_update_default_device().

Signed-off-by: Huacai Chen <chenhuacai at loongson.cn>
Signed-off-by: Bjorn Helgaas <bhelgaas at google.com>
---
 drivers/gpu/vga/vgaarb.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
index 29e725ebaa43..f8f95244d499 100644
--- a/drivers/gpu/vga/vgaarb.c
+++ b/drivers/gpu/vga/vgaarb.c
@@ -579,6 +579,21 @@ static bool vga_arb_integrated_gpu(struct device *dev)
 }
 #endif
 
+static void vga_arb_update_default_device(struct vga_device *vgadev)
+{
+	struct pci_dev *pdev = vgadev->pdev;
+
+	/*
+	 * If we don't have a default VGA device yet, and this device owns
+	 * the legacy VGA resources, make it the default.
+	 */
+	if (!vga_default_device() &&
+	    ((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK)) {
+		vgaarb_info(&pdev->dev, "setting as boot VGA device\n");
+		vga_set_default_device(pdev);
+	}
+}
+
 /*
  * Rules for using a bridge to control a VGA descendant decoding: if a bridge
  * has only one VGA descendant then it can be used to control the VGA routing
@@ -706,15 +721,7 @@ static bool vga_arbiter_add_pci_device(struct pci_dev *pdev)
 		bus = bus->parent;
 	}
 
-	/* Deal with VGA default device. Use first enabled one
-	 * by default if arch doesn't have it's own hook
-	 */
-	if (!vga_default_device() &&
-	    ((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK)) {
-		vgaarb_info(&pdev->dev, "setting as boot VGA device\n");
-		vga_set_default_device(pdev);
-	}
-
+	vga_arb_update_default_device(vgadev);
 	vga_arbiter_check_bridge_sharing(vgadev);
 
 	/* Add to the list */
-- 
2.27.0