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efifb: Skip DMI checks if the bootloader knows what it's doing

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The majority of the DMI checks in efifb are for cases where the bootloader
has provided invalid information. However, on some machines the overrides
may do more harm than good due to configuration differences between machines
with the same machine identifier. It turns out that it's possible for the
bootloader to get the correct information on GOP-based systems, but we
can't guarantee that the kernel's being booted with one that's been updated
to do so. Add support for a capabilities flag that can be set by the
bootloader, and skip the DMI checks in that case. Additionally, set this
flag in the UEFI stub code.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Acked-by: Peter Jones <pjones@redhat.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Matthew Garrett 2012-07-27 12:58:53 -04:00 committed by Matt Fleming
parent d6cf86d8f2
commit f462ed939d
3 changed files with 7 additions and 1 deletions
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2
arch/x86/boot/compressed/eboot.c
View file

@ -379,6 +379,8 @@ static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
si->rsvd_pos = 0;
}
si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
free_handle:
efi_call_phys1(sys_table->boottime->free_pool, gop_handle);
return status;

4
drivers/video/efifb.c
View file

@ -553,7 +553,9 @@ static int __init efifb_init(void)
int ret;
char *option = NULL;
dmi_check_system(dmi_system_table);
if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI ||
!(screen_info.capabilities & VIDEO_CAPABILITY_SKIP_QUIRKS))
dmi_check_system(dmi_system_table);
if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
return -ENODEV;

2
include/linux/screen_info.h
View file

@ -68,6 +68,8 @@ struct screen_info {
#define VIDEO_FLAGS_NOCURSOR (1 << 0) /* The video mode has no cursor set */
#define VIDEO_CAPABILITY_SKIP_QUIRKS (1 << 0)
#ifdef __KERNEL__
extern struct screen_info screen_info;