From 4c5b161e3f0a2daa7d37bb9d77b5dba468dd3c0e Mon Sep 17 00:00:00 2001 From: "Ronald G. Minnich" Date: Fri, 28 Jun 2013 14:33:30 -0700 Subject: EDID: add fields specialized to the needs of framebuffers 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 Reviewed-on: https://gerrit.chromium.org/gerrit/60514 Tested-by: Ronald G. Minnich Reviewed-by: Aaron Durbin Commit-Queue: Ronald G. Minnich Reviewed-on: http://review.coreboot.org/4336 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich --- src/lib/edid.c | 24 ++++++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-) (limited to 'src/lib') diff --git a/src/lib/edid.c b/src/lib/edid.c index d0e8b98b52..aa12596d89 100644 --- a/src/lib/edid.c +++ b/src/lib/edid.c @@ -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; -- cgit v1.2.3