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platform_kernel-5.15
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efifb: Implement vga_default_device() (v2) 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/x86/include/asm/vga.h
View File

@ -17,4 +17,10 @@
#define vga_readb(x) (*(x)) #define vga_readb(x) (*(x))
#define vga_writeb(x, y) (*(y) = (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 */ #endif /* _ASM_X86_VGA_H */

77
drivers/video/efifb.c
View File

@ -18,6 +18,8 @@
static bool request_mem_succeeded = false; static bool request_mem_succeeded = false;
static struct pci_dev *default_vga;
static struct fb_var_screeninfo efifb_defined __devinitdata = { static struct fb_var_screeninfo efifb_defined __devinitdata = {
.activate = FB_ACTIVATE_NOW, .activate = FB_ACTIVATE_NOW,
.height = -1, .height = -1,
@ -298,35 +300,70 @@ static struct fb_ops efifb_ops = {
.fb_imageblit = cfb_imageblit, .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) static int __init efifb_setup(char *options)
{ {
char *this_opt; char *this_opt;
int i; int i;
struct pci_dev *dev = NULL;
if (!options || !*options) if (options && *options) {
return 0; while ((this_opt = strsep(&options, ",")) != NULL) {
if (!*this_opt) continue;
while ((this_opt = strsep(&options, ",")) != NULL) { for (i = 0; i < M_UNKNOWN; i++) {
if (!*this_opt) continue; if (!strcmp(this_opt, dmi_list[i].optname) &&
dmi_list[i].base != 0) {
for (i = 0; i < M_UNKNOWN; i++) { screen_info.lfb_base = dmi_list[i].base;
if (!strcmp(this_opt, dmi_list[i].optname) && screen_info.lfb_linelength = dmi_list[i].stride;
dmi_list[i].base != 0) { screen_info.lfb_width = dmi_list[i].width;
screen_info.lfb_base = dmi_list[i].base; screen_info.lfb_height = dmi_list[i].height;
screen_info.lfb_linelength = dmi_list[i].stride; }
screen_info.lfb_width = dmi_list[i].width;
screen_info.lfb_height = dmi_list[i].height;
} }
if (!strncmp(this_opt, "base:", 5))
screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
else if (!strncmp(this_opt, "stride:", 7))
screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
else if (!strncmp(this_opt, "height:", 7))
screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
else if (!strncmp(this_opt, "width:", 6))
screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
} }
if (!strncmp(this_opt, "base:", 5))
screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
else if (!strncmp(this_opt, "stride:", 7))
screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
else if (!strncmp(this_opt, "height:", 7))
screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
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; return 0;
} }