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authorBjorn Helgaas <bhelgaas@google.com>2017-10-13 06:47:29 +0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2017-10-18 11:04:56 +0300
commit505a1b571711a977b7d069dec3c14381521e9683 (patch)
tree8b74843c99dda03db00dec7b4f59ccfe1da49f64 /drivers/gpu/vga
parenta37c0f48950b56f6ef2ee637ba597855504e3056 (diff)
downloadlinux-505a1b571711a977b7d069dec3c14381521e9683.tar.xz
vgaarb: Factor out EFI and fallback default device selection
The default VGA device is normally set in vga_arbiter_add_pci_device() when we call it for the first enabled device that can be accessed with the legacy VGA resources ([mem 0xa0000-0xbffff], etc.) That default device can be overridden by an EFI device that owns the boot framebuffer. As a fallback, we can also select a VGA device that can't be accessed via legacy VGA resources, or a VGA device that isn't even enabled. Factor out this EFI and fallback selection from vga_arb_device_init() into a separate vga_arb_select_default_device() function. This doesn't change any behavior, but it untangles the "bridge control possible" checking and messages from the default device selection. Tested-by: Zhou Wang <wangzhou1@hisilicon.com> # D05 Hisi Hip07, Hip08 Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Daniel Axtens <dja@axtens.net> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20171013034729.14630.30419.stgit@bhelgaas-glaptop.roam.corp.google.com
Diffstat (limited to 'drivers/gpu/vga')
-rw-r--r--drivers/gpu/vga/vgaarb.c57
1 files changed, 35 insertions, 22 deletions
diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
index 8035e38d5110..d35d6d271f3f 100644
--- a/drivers/gpu/vga/vgaarb.c
+++ b/drivers/gpu/vga/vgaarb.c
@@ -1402,29 +1402,14 @@ static struct miscdevice vga_arb_device = {
MISC_DYNAMIC_MINOR, "vga_arbiter", &vga_arb_device_fops
};
-static int __init vga_arb_device_init(void)
+static void __init vga_arb_select_default_device(void)
{
- int rc;
struct pci_dev *pdev;
struct vga_device *vgadev;
- rc = misc_register(&vga_arb_device);
- if (rc < 0)
- pr_err("error %d registering device\n", rc);
-
- bus_register_notifier(&pci_bus_type, &pci_notifier);
-
- /* We add all pci devices satisfying vga class in the arbiter by
- * default */
- pdev = NULL;
- while ((pdev =
- pci_get_subsys(PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
- PCI_ANY_ID, pdev)) != NULL)
- vga_arbiter_add_pci_device(pdev);
-
+#if defined(CONFIG_X86) || defined(CONFIG_IA64)
list_for_each_entry(vgadev, &vga_list, list) {
struct device *dev = &vgadev->pdev->dev;
-#if defined(CONFIG_X86) || defined(CONFIG_IA64)
/*
* Override vga_arbiter_add_pci_device()'s I/O based detection
* as it may take the wrong device (e.g. on Apple system under
@@ -1461,12 +1446,8 @@ static int __init vga_arb_device_init(void)
vgaarb_info(dev, "overriding boot device\n");
vga_set_default_device(vgadev->pdev);
}
-#endif
- if (vgadev->bridge_has_one_vga)
- vgaarb_info(dev, "bridge control possible\n");
- else
- vgaarb_info(dev, "no bridge control possible\n");
}
+#endif
if (!vga_default_device()) {
list_for_each_entry(vgadev, &vga_list, list) {
@@ -1492,6 +1473,38 @@ static int __init vga_arb_device_init(void)
vga_set_default_device(vgadev->pdev);
}
}
+}
+
+static int __init vga_arb_device_init(void)
+{
+ int rc;
+ struct pci_dev *pdev;
+ struct vga_device *vgadev;
+
+ rc = misc_register(&vga_arb_device);
+ if (rc < 0)
+ pr_err("error %d registering device\n", rc);
+
+ bus_register_notifier(&pci_bus_type, &pci_notifier);
+
+ /* We add all PCI devices satisfying VGA class in the arbiter by
+ * default */
+ pdev = NULL;
+ while ((pdev =
+ pci_get_subsys(PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
+ PCI_ANY_ID, pdev)) != NULL)
+ vga_arbiter_add_pci_device(pdev);
+
+ list_for_each_entry(vgadev, &vga_list, list) {
+ struct device *dev = &vgadev->pdev->dev;
+
+ if (vgadev->bridge_has_one_vga)
+ vgaarb_info(dev, "bridge control possible\n");
+ else
+ vgaarb_info(dev, "no bridge control possible\n");
+ }
+
+ vga_arb_select_default_device();
pr_info("loaded\n");
return rc;