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Preferred resolution detection for VBE.

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* 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_edid_checksum): Likewise.
(grub_vbe_get_preferred_mode): Likewise.  Try EDID followed by the
Flat Panel extension, in line with the X.org VESA driver.
(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.
* include/grub/i386/pc/vbe.h (struct grub_vbe_flat_panel_info): New
structure.
(struct grub_vbe_edid_info): Likewise.
(grub_vbe_bios_get_flat_panel_info): Add prototype.
(grub_vbe_bios_get_ddc_capabilities): Likewise.
(grub_vbe_bios_read_edid): Likewise.

* util/grub.d/00_header.in (GRUB_GFXMODE): Default to "auto".  This
is more appropriate on a wider range of platforms than 640x480.
This commit is contained in:
Colin Watson 2010-12-14 16:22:19 +00:00
parent 159b4a8bb7
commit e03f549b3e
4 changed files with 256 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
ChangeLog.vbe-autodetect Normal file
View file

@ -0,0 +1,25 @@
2010-12-14 Colin Watson <cjwatson@ubuntu.com>
Preferred resolution detection for VBE.
* 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_edid_checksum): Likewise.
(grub_vbe_get_preferred_mode): Likewise. Try EDID followed by the
Flat Panel extension, in line with the X.org VESA driver.
(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.
* include/grub/i386/pc/vbe.h (struct grub_vbe_flat_panel_info): New
structure.
(struct grub_vbe_edid_info): Likewise.
(grub_vbe_bios_get_flat_panel_info): Add prototype.
(grub_vbe_bios_get_ddc_capabilities): Likewise.
(grub_vbe_bios_read_edid): Likewise.
* util/grub.d/00_header.in (GRUB_GFXMODE): Default to "auto". This
is more appropriate on a wider range of platforms than 640x480.

150
grub-core/video/i386/pc/vbe.c
View file

@ -273,6 +273,56 @@ grub_vbe_bios_get_pm_interface (grub_uint16_t *segment, grub_uint16_t *offset,
return regs.eax & 0xffff;
}
/* Call VESA BIOS 0x4f11 to get flat panel information, return status. */
grub_vbe_status_t
grub_vbe_bios_get_flat_panel_info (struct grub_vbe_flat_panel_info *flat_panel_info)
{
struct grub_bios_int_registers regs;
regs.eax = 0x4f11;
regs.ebx = 0x0001;
regs.es = (((grub_addr_t) flat_panel_info) & 0xffff0000) >> 4;
regs.edi = ((grub_addr_t) flat_panel_info) & 0xffff;
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
grub_bios_interrupt (0x10, &regs);
return regs.eax & 0xffff;
}
/* Call VESA BIOS 0x4f15 to get DDC availability, return status. */
grub_vbe_status_t
grub_vbe_bios_get_ddc_capabilities (grub_uint8_t *level)
{
struct grub_bios_int_registers regs;
regs.eax = 0x4f15;
regs.ebx = 0x0000;
regs.ecx = 0x0000;
regs.es = 0x0000;
regs.edi = 0x0000;
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
grub_bios_interrupt (0x10, &regs);
*level = regs.ebx & 0xff;
return regs.eax & 0xffff;
}
/* Call VESA BIOS 0x4f15 to read EDID information, return status. */
grub_vbe_status_t
grub_vbe_bios_read_edid (struct grub_vbe_edid_info *edid_info)
{
struct grub_bios_int_registers regs;
regs.eax = 0x4f15;
regs.ebx = 0x0001;
regs.ecx = 0x0000;
regs.edx = 0x0000;
regs.es = (((grub_addr_t) edid_info) & 0xffff0000) >> 4;
regs.edi = ((grub_addr_t) edid_info) & 0xffff;
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
grub_bios_interrupt (0x10, &regs);
return regs.eax & 0xffff;
}
grub_err_t
grub_vbe_probe (struct grub_vbe_info_block *info_block)
@ -327,6 +377,70 @@ grub_vbe_probe (struct grub_vbe_info_block *info_block)
return GRUB_ERR_NONE;
}
static grub_err_t
grub_vbe_edid_checksum (struct grub_vbe_edid_info *edid_info)
{
const char *edid_bytes = (const char *) edid_info;
int i;
char checksum = 0;
/* Check EDID checksum. */
for (i = 0; i < 128; ++i)
checksum += edid_bytes[i];
if (checksum != 0)
return grub_error (GRUB_ERR_BAD_DEVICE,
"invalid EDID checksum %d", checksum);
grub_errno = GRUB_ERR_NONE;
return grub_errno;
}
static grub_err_t
grub_vbe_get_preferred_mode (unsigned int *width, unsigned int *height)
{
grub_vbe_status_t status;
grub_uint8_t ddc_level;
struct grub_vbe_edid_info edid_info;
struct grub_vbe_flat_panel_info flat_panel_info;
if (controller_info.version >= 0x200
&& (grub_vbe_bios_get_ddc_capabilities (&ddc_level) & 0xff)
== GRUB_VBE_STATUS_OK)
{
status = grub_vbe_bios_read_edid (&edid_info);
/* Bit 1 in the Feature Support field indicates that the first
Detailed Timing Description is the preferred timing mode. */
if (status == GRUB_VBE_STATUS_OK
&& grub_vbe_edid_checksum (&edid_info) == GRUB_ERR_NONE
&& edid_info.version == 1 /* we don't understand later versions */
&& (edid_info.feature_support
& GRUB_VBE_EDID_FEATURE_PREFERRED_TIMING_MODE)
&& edid_info.detailed_timings[0].pixel_clock)
{
*width = edid_info.detailed_timings[0].horizontal_active_lo
| (((unsigned int)
(edid_info.detailed_timings[0].horizontal_hi & 0xf0))
<< 4);
*height = edid_info.detailed_timings[0].vertical_active_lo
| (((unsigned int)
(edid_info.detailed_timings[0].vertical_hi & 0xf0))
<< 4);
return GRUB_ERR_NONE;
}
}
status = grub_vbe_bios_get_flat_panel_info (&flat_panel_info);
if (status == GRUB_VBE_STATUS_OK)
{
*width = flat_panel_info.horizontal_size;
*height = flat_panel_info.vertical_size;
return GRUB_ERR_NONE;
}
return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "cannot get preferred mode");
}
grub_err_t
grub_vbe_set_video_mode (grub_uint32_t vbe_mode,
struct grub_vbe_mode_info_block *vbe_mode_info)
@ -695,11 +809,28 @@ grub_video_vbe_setup (unsigned int width, unsigned int height,
struct grub_vbe_mode_info_block best_vbe_mode_info;
grub_uint32_t best_vbe_mode = 0;
int depth;
int preferred_mode = 0;
/* Decode depth from mode_type. If it is zero, then autodetect. */
depth = (mode_type & GRUB_VIDEO_MODE_TYPE_DEPTH_MASK)
>> GRUB_VIDEO_MODE_TYPE_DEPTH_POS;
if (width == 0 && height == 0)
{
grub_vbe_get_preferred_mode (&width, &height);
if (grub_errno == GRUB_ERR_NONE)
preferred_mode = 1;
else
{
/* Fall back to 640x480. This is conservative, but the largest
mode supported by the graphics card may not be safe for the
display device. */
grub_errno = GRUB_ERR_NONE;
width = 640;
height = 480;
}
}
/* Walk thru mode list and try to find matching mode. */
for (p = vbe_mode_list; *p != 0xFFFF; p++)
{
@ -742,10 +873,21 @@ grub_video_vbe_setup (unsigned int width, unsigned int height,
/* Unsupported bitdepth . */
continue;
if (((vbe_mode_info.x_resolution != width)
|| (vbe_mode_info.y_resolution != height)) && width != 0 && height != 0)
/* Non matching resolution. */
continue;
if (preferred_mode)
{
if (vbe_mode_info.x_resolution > width
|| vbe_mode_info.y_resolution > height)
/* Resolution exceeds that of preferred mode. */
continue;
}
else
{
if (((vbe_mode_info.x_resolution != width)
|| (vbe_mode_info.y_resolution != height))
&& width != 0 && height != 0)
/* Non matching resolution. */
continue;
}
/* Check if user requested RGB or index color mode. */
if ((mode_mask & GRUB_VIDEO_MODE_TYPE_COLOR_MASK) != 0)

84
include/grub/i386/pc/vbe.h
View file

@ -169,6 +169,81 @@ 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));
struct grub_vbe_edid_info
{
grub_uint8_t header[8];
grub_uint16_t manufacturer_id;
grub_uint16_t product_id;
grub_uint32_t serial_number;
grub_uint8_t week_of_manufacture;
grub_uint8_t year_of_manufacture;
grub_uint8_t version;
grub_uint8_t revision;
grub_uint8_t video_input_definition;
grub_uint8_t max_horizontal_image_size;
grub_uint8_t max_vertical_image_size;
grub_uint8_t display_gamma;
grub_uint8_t feature_support;
#define GRUB_VBE_EDID_FEATURE_PREFERRED_TIMING_MODE (1 << 1)
grub_uint8_t red_green_lo;
grub_uint8_t blue_white_lo;
grub_uint8_t red_x_hi;
grub_uint8_t red_y_hi;
grub_uint8_t green_x_hi;
grub_uint8_t green_y_hi;
grub_uint8_t blue_x_hi;
grub_uint8_t blue_y_hi;
grub_uint8_t white_x_hi;
grub_uint8_t white_y_hi;
grub_uint8_t established_timings_1;
grub_uint8_t established_timings_2;
grub_uint8_t manufacturer_reserved_timings;
grub_uint16_t standard_timings[8];
struct {
grub_uint16_t pixel_clock;
/* Only valid if the pixel clock is non-null. */
grub_uint8_t horizontal_active_lo;
grub_uint8_t horizontal_blanking_lo;
grub_uint8_t horizontal_hi;
grub_uint8_t vertical_active_lo;
grub_uint8_t vertical_blanking_lo;
grub_uint8_t vertical_hi;
grub_uint8_t horizontal_sync_offset_lo;
grub_uint8_t horizontal_sync_pulse_width_lo;
grub_uint8_t vertical_sync_lo;
grub_uint8_t sync_hi;
grub_uint8_t horizontal_image_size_lo;
grub_uint8_t vertical_image_size_lo;
grub_uint8_t image_size_hi;
grub_uint8_t horizontal_border;
grub_uint8_t vertical_border;
grub_uint8_t flags;
} detailed_timings[4];
grub_uint8_t extension_flag;
grub_uint8_t checksum;
} __attribute__ ((packed));
/* Prototypes for helper functions. */
/* Call VESA BIOS 0x4f00 to get VBE Controller Information, return status. */
grub_vbe_status_t
@ -197,6 +272,15 @@ grub_vbe_bios_get_scanline_length (grub_uint32_t *length);
grub_vbe_status_t
grub_vbe_bios_get_display_start (grub_uint32_t *x,
grub_uint32_t *y);
/* Call VESA BIOS 0x4f11 to get flat panel information, return status. */
grub_vbe_status_t
grub_vbe_bios_get_flat_panel_info (struct grub_vbe_flat_panel_info *flat_panel_info);
/* Call VESA BIOS 0x4f15 to get DDC availability, return status. */
grub_vbe_status_t
grub_vbe_bios_get_ddc_capabilities (grub_uint8_t *level);
/* Call VESA BIOS 0x4f15 to read EDID information, return status. */
grub_vbe_status_t
grub_vbe_bios_read_edid (struct grub_vbe_edid_info *edid_data);
grub_vbe_status_t grub_vbe_bios_getset_dac_palette_width (int set, int *width);

2
util/grub.d/00_header.in
View file

@ -36,7 +36,7 @@ done
if [ "x${GRUB_DEFAULT}" = "x" ] ; then GRUB_DEFAULT=0 ; fi
if [ "x${GRUB_DEFAULT}" = "xsaved" ] ; then GRUB_DEFAULT='${saved_entry}' ; fi
if [ "x${GRUB_TIMEOUT}" = "x" ] ; then GRUB_TIMEOUT=5 ; fi
if [ "x${GRUB_GFXMODE}" = "x" ] ; then GRUB_GFXMODE=640x480 ; fi
if [ "x${GRUB_GFXMODE}" = "x" ] ; then GRUB_GFXMODE=auto ; fi
if [ "x${GRUB_DEFAULT_BUTTON}" = "x" ] ; then GRUB_DEFAULT_BUTTON="$GRUB_DEFAULT" ; fi
if [ "x${GRUB_DEFAULT_BUTTON}" = "xsaved" ] ; then GRUB_DEFAULT_BUTTON='${saved_entry}' ; fi