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EDID: add fields specialized to the needs of framebuffers

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Now that we have horizontal display areas that are not multiples of 32  bytes,
things are more complex. We add three struct members (x, y resolution and
bytes per line) which are to be filled in by the mainboard as it sets the mode.

In future, the EDID code may take a stab at initializing these but the values are
context-dependent.

Change-Id: Ib9102d6bbf8c66931f5adb1029a04b881a982cfe
Signed-off-by: Ronald G. Minnich <rminnich@google.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/60514
Tested-by: Ronald G. Minnich <rminnich@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Commit-Queue: Ronald G. Minnich <rminnich@chromium.org>
Reviewed-on: http://review.coreboot.org/4336
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
Ronald G. Minnich
2013-06-28 14:33:30 -07:00
committed by Stefan Reinauer
parent 3ece50d9db
commit 4c5b161e3f
2 changed files with 28 additions and 4 deletions
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24
src/lib/edid.c
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@ -457,6 +457,23 @@ detailed_block(struct edid *out, unsigned char *x, int in_extension)
out->vso = ((x[10] >> 4) + ((x[11] & 0x0C) << 2));
out->vspw = ((x[10] & 0x0F) + ((x[11] & 0x03) << 4));
out->vborder = x[16];
/* set up some reasonable defaults for payloads.
* We observe that most modern chipsets we work with
* tend to support rgb888 without regard to the
* panel bits per color or other settings. The rgb888
* is a convenient layout for software because
* it avoids the messy bit stuffing of rgb565 or rgb444.
* It makes a reasonable trade of memory for speed.
* So, set up the default for
* 32 bits per pixel
* rgb888 (i.e. no alpha, but pixels on 32-bit boundaries)
* The mainboard can modify these if needed, though
* we have yet to see a case where that will happen.
*/
out->bpp = 32;
out->x_resolution = ALIGN(out->ha * ((out->bpp + 7) / 8),64) / (out->bpp/8);
out->y_resolution = out->va;
out->bytes_per_line = ALIGN(out->ha * ((out->bpp + 7) / 8),64);
printk(BIOS_SPEW, "Did detailed timing\n");
}
did_detailed_timing = 1;
@ -1398,8 +1415,9 @@ int decode_edid(unsigned char *edid, int size, struct edid *out)
void set_vbe_mode_info_valid(struct edid *edid, uintptr_t fb_addr)
{
edid_fb.physical_address = fb_addr;
edid_fb.x_resolution = edid->ha;
edid_fb.y_resolution = edid->va;
edid_fb.x_resolution = edid->x_resolution;
edid_fb.y_resolution = edid->y_resolution;
edid_fb.bytes_per_line = edid->bytes_per_line;
/* In the case of (e.g.) 24bpp, the convention nowadays
* seems to be to round it up to the nearest reasonable
* boundary, because otherwise the byte-packing is hideous.
@ -1416,7 +1434,6 @@ void set_vbe_mode_info_valid(struct edid *edid, uintptr_t fb_addr)
case 32:
case 24:
/* packed into 4-byte words */
edid_fb.bytes_per_line = edid->ha * 4;
edid_fb.red_mask_pos = 16;
edid_fb.red_mask_size = 8;
edid_fb.green_mask_pos = 8;
@ -1426,7 +1443,6 @@ void set_vbe_mode_info_valid(struct edid *edid, uintptr_t fb_addr)
break;
case 16:
/* packed into 2-byte words */
edid_fb.bytes_per_line = edid->ha * 2;
edid_fb.red_mask_pos = 12;
edid_fb.red_mask_size = 4;
edid_fb.green_mask_pos = 8;