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ati-vga: try vga ddc first 

Try vga ddc bus before dvi ddc bus.
Return early in case we got valid data.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2019-06-24 12:17:28 +02:00
parent ae9a9796ec
commit af573dceef
1 changed files with 9 additions and 0 deletions
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9
vgasrc/atiext.c
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@ -299,6 +299,15 @@ static void ati_i2c_edid_radeon(void)
SET_VGA(ati_i2c_bit_sda_out, 16);
SET_VGA(ati_i2c_bit_sda_in, 8);
dprintf(1, "ati: reading edid blob (radeon vga) ... \n");
SET_VGA(ati_i2c_reg, GPIO_VGA_DDC);
ati_i2c_edid();
valid = (GET_GLOBAL(VBE_edid[0]) == 0x00 &&
GET_GLOBAL(VBE_edid[1]) == 0xff);
dprintf(1, "ati: ... %s\n", valid ? "good" : "invalid");
if (valid)
return;
dprintf(1, "ati: reading edid blob (radeon dvi) ... \n");
SET_VGA(ati_i2c_reg, GPIO_DVI_DDC);
ati_i2c_edid();