diff options
Diffstat (limited to 'drivers/video/fbdev/efifb.c')
| -rw-r--r-- | drivers/video/fbdev/efifb.c | 66 |
1 files changed, 65 insertions, 1 deletions
diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c index 8c4dc1e1f94f..b827a8113e26 100644 --- a/drivers/video/fbdev/efifb.c +++ b/drivers/video/fbdev/efifb.c @@ -10,6 +10,7 @@ #include <linux/efi.h> #include <linux/errno.h> #include <linux/fb.h> +#include <linux/pci.h> #include <linux/platform_device.h> #include <linux/screen_info.h> #include <video/vga.h> @@ -143,6 +144,8 @@ static struct attribute *efifb_attrs[] = { }; ATTRIBUTE_GROUPS(efifb); +static bool pci_dev_disabled; /* FB base matches BAR of a disabled device */ + static int efifb_probe(struct platform_device *dev) { struct fb_info *info; @@ -152,7 +155,7 @@ static int efifb_probe(struct platform_device *dev) unsigned int size_total; char *option = NULL; - if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI) + if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled) return -ENODEV; if (fb_get_options("efifb", &option)) @@ -360,3 +363,64 @@ static struct platform_driver efifb_driver = { }; builtin_platform_driver(efifb_driver); + +#if defined(CONFIG_PCI) && !defined(CONFIG_X86) + +static bool pci_bar_found; /* did we find a BAR matching the efifb base? */ + +static void claim_efifb_bar(struct pci_dev *dev, int idx) +{ + u16 word; + + pci_bar_found = true; + + pci_read_config_word(dev, PCI_COMMAND, &word); + if (!(word & PCI_COMMAND_MEMORY)) { + pci_dev_disabled = true; + dev_err(&dev->dev, + "BAR %d: assigned to efifb but device is disabled!\n", + idx); + return; + } + + if (pci_claim_resource(dev, idx)) { + pci_dev_disabled = true; + dev_err(&dev->dev, + "BAR %d: failed to claim resource for efifb!\n", idx); + return; + } + + dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx); +} + +static void efifb_fixup_resources(struct pci_dev *dev) +{ + u64 base = screen_info.lfb_base; + u64 size = screen_info.lfb_size; + int i; + + if (pci_bar_found || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI) + return; + + if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) + base |= (u64)screen_info.ext_lfb_base << 32; + + if (!base) + return; + + for (i = 0; i < PCI_STD_RESOURCE_END; i++) { + struct resource *res = &dev->resource[i]; + + if (!(res->flags & IORESOURCE_MEM)) + continue; + + if (res->start <= base && res->end >= base + size - 1) { + claim_efifb_bar(dev, i); + break; + } + } +} +DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY, + 16, efifb_fixup_resources); + +#endif |