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efifb: Implement vga_default_device() (v2)

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EFI doesn't typically make use of the legacy VGA ROM, but it may still be
configured to pass that through to a given video device. This may lead to
an inaccurate choice of default video device. Add support to efifb to pick
out the correct active video device.

v2: fix if->ifdef

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Acked-by: hpa@zytor.com
Cc: matt.fleming@intel.com
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Matthew Garrett 2012-04-16 16:26:05 -04:00 committed by Dave Airlie
parent 88674088d1
commit b4aa016305
2 changed files with 63 additions and 20 deletions
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6
arch/x86/include/asm/vga.h
View file

@ -17,4 +17,10 @@
#define vga_readb(x) (*(x))
#define vga_writeb(x, y) (*(y) = (x))
#ifdef CONFIG_FB_EFI
#define __ARCH_HAS_VGA_DEFAULT_DEVICE
extern struct pci_dev *vga_default_device(void);
extern void vga_set_default_device(struct pci_dev *pdev);
#endif
#endif /* _ASM_X86_VGA_H */

43
drivers/video/efifb.c
View file

@ -18,6 +18,8 @@
static bool request_mem_succeeded = false;
static struct pci_dev *default_vga;
static struct fb_var_screeninfo efifb_defined __devinitdata = {
.activate = FB_ACTIVATE_NOW,
.height = -1,
@ -298,14 +300,23 @@ static struct fb_ops efifb_ops = {
.fb_imageblit = cfb_imageblit,
};
struct pci_dev *vga_default_device(void)
{
return default_vga;
}
void vga_set_default_device(struct pci_dev *pdev)
{
default_vga = pdev;
}
static int __init efifb_setup(char *options)
{
char *this_opt;
int i;
struct pci_dev *dev = NULL;
if (!options || !*options)
return 0;
if (options && *options) {
while ((this_opt = strsep(&options, ",")) != NULL) {
if (!*this_opt) continue;
@ -327,6 +338,32 @@ static int __init efifb_setup(char *options)
else if (!strncmp(this_opt, "width:", 6))
screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
}
}
for_each_pci_dev(dev) {
int i;
if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
continue;
for (i=0; i < DEVICE_COUNT_RESOURCE; i++) {
resource_size_t start, end;
if (!(pci_resource_flags(dev, i) & IORESOURCE_MEM))
continue;
start = pci_resource_start(dev, i);
end = pci_resource_end(dev, i);
if (!start || !end)
continue;
if (screen_info.lfb_base >= start &&
(screen_info.lfb_base + screen_info.lfb_size) < end)
default_vga = dev;
}
}
return 0;
}