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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
hifive-unleashed-5.1
Bjorn Helgaas 2017-10-12 22:47:29 -05:00 committed by Daniel Vetter
parent a37c0f4895
commit 505a1b5717
1 changed files with 35 additions and 22 deletions
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57
drivers/gpu/vga/vgaarb.c
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@ -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;