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Preferred resolution detection for VBE.

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* grub-core/video/video.c (grub_video_edid_checksum): New function.
(grub_video_edid_preferred_mode): Likewise.  Try EDID followed by
the Flat Panel extension, in line with the X.org VESA driver.
* grub-core/video/i386/pc/vbe.c (grub_vbe_bios_get_flat_panel_info):
New function.
(grub_vbe_bios_get_ddc_capabilities): Likewise.
(grub_vbe_bios_read_edid): Likewise.
(grub_vbe_get_preferred_mode): Likewise.
(grub_video_vbe_setup): When the mode is "auto", try to get the
preferred mode from VBE, and use the largest mode that is no larger
than the preferred mode (some BIOSes expose a preferred mode that is
not in their mode list!).  If this fails, fall back to 640x480 as a
safe conservative choice.
(grub_video_vbe_get_edid): New function.
(grub_video_vbe_adapter): Add get_edid.
* include/grub/video.h (struct grub_vbe_edid_info): New structure.
(struct grub_video_adapter): Add get_edid.
(grub_video_edid_checksum): Add prototype.
(grub_video_edid_preferred_mode): Likewise.
* include/grub/i386/pc/vbe.h (struct grub_vbe_flat_panel_info): New
structure.

* grub-core/commands/videoinfo.c (print_edid): New function.
(grub_cmd_videoinfo): Print EDID if available.

* util/grub.d/00_header.in (GRUB_GFXMODE): Default to "auto".  This
is more appropriate on a wider range of platforms than 640x480.
* docs/grub.texi (Simple configuration): Update GRUB_GFXMODE
documentation.
This commit is contained in:
Colin Watson 2011-07-21 19:46:44 +01:00
commit 8fc4fa45c5
8 changed files with 333 additions and 6 deletions
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17
include/grub/i386/pc/vbe.h
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@ -19,6 +19,8 @@
#ifndef GRUB_VBE_MACHINE_HEADER
#define GRUB_VBE_MACHINE_HEADER 1
#include <grub/video.h>
/* Default video mode to be used. */
#define GRUB_VBE_DEFAULT_VIDEO_MODE 0x101
@ -169,6 +171,21 @@ struct grub_vbe_palette_data
grub_uint8_t alignment;
} __attribute__ ((packed));
struct grub_vbe_flat_panel_info
{
grub_uint16_t horizontal_size;
grub_uint16_t vertical_size;
grub_uint16_t panel_type;
grub_uint8_t red_bpp;
grub_uint8_t green_bpp;
grub_uint8_t blue_bpp;
grub_uint8_t reserved_bpp;
grub_uint32_t reserved_offscreen_mem_size;
grub_vbe_farptr_t reserved_offscreen_mem_ptr;
grub_uint8_t reserved[14];
} __attribute__ ((packed));
/* Prototypes for helper functions. */
/* Call VESA BIOS 0x4f00 to get VBE Controller Information, return status. */
grub_vbe_status_t