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move more EDID-handling functions to generic code, and make videoinfo display EDID information

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This commit is contained in:
Colin Watson 2010-12-14 18:03:34 +00:00
parent 25d884a52a
commit 129185cfaa
5 changed files with 108 additions and 23 deletions
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43
grub-core/video/video.c
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@ -393,6 +393,49 @@ grub_video_edid_checksum (struct grub_video_edid_info *edid_info)
return grub_errno;
}
grub_err_t
grub_video_get_edid (struct grub_video_edid_info *edid_info)
{
if (! grub_video_adapter_active)
return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");
if (! grub_video_adapter_active->get_edid)
return grub_error (GRUB_ERR_BAD_DEVICE,
"EDID information unavailable for this video mode");
if (grub_video_adapter_active->get_edid (edid_info) != GRUB_ERR_NONE)
return grub_errno;
if (grub_video_edid_checksum (edid_info) != GRUB_ERR_NONE)
return grub_errno;
return GRUB_ERR_NONE;
}
grub_err_t
grub_video_edid_preferred_mode (struct grub_video_edid_info *edid_info,
unsigned int *width, unsigned int *height)
{
/* Bit 1 in the Feature Support field indicates that the first
Detailed Timing Description is the preferred timing mode. */
if (edid_info->version == 1 /* we don't understand later versions */
&& (edid_info->feature_support
& GRUB_VIDEO_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;
}
return grub_error (GRUB_ERR_BAD_DEVICE, "no preferred mode available");
}
/* Parse <width>x<height>[x<depth>]*/
static grub_err_t
parse_modespec (const char *current_mode, int *width, int *height, int *depth)