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Fixed error checks for EDID retrieval.

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git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@19582 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler 2006-12-20 22:49:53 +00:00
parent f1994d8b4c
commit d6edf65b05
1 changed files with 8 additions and 4 deletions
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12
src/system/boot/platform/bios_ia32/video.cpp
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@ -195,12 +195,15 @@ vesa_get_edid(edid1_info *info)
regs.edi = 0;
call_bios(0x10, &regs);
dprintf("EDID1: %lx\n", regs.eax);
// %ah contains the error code
if ((regs.eax & 0xff00) != 0)
// %al determines wether or not the function is supported
if (regs.eax != 0x4f)
return B_NOT_SUPPORTED;
// test if EDID v1 is supported by the monitor
if (((regs.ebx >> 8) & 1) == 0)
dprintf("EDID2: ebx %lx\n", regs.ebx);
// test if DDC is supported by the monitor
if ((regs.ebx & 3) == 0)
return B_NOT_SUPPORTED;
edid1_raw edidRaw;
@ -213,8 +216,9 @@ vesa_get_edid(edid1_info *info)
regs.es = ADDRESS_SEGMENT(&edidRaw);
regs.edi = ADDRESS_OFFSET(&edidRaw);
call_bios(0x10, &regs);
dprintf("EDID3: %lx\n", regs.eax);
if ((regs.eax & 0xff00) != 0)
if (regs.eax != 0x4f)
return B_NOT_SUPPORTED;
// retrieved EDID - now parse it