From: Gerd Hoffmann <kraxel@redhat.com>
Date: Mon, 24 Jun 2019 10:17:28 +0000 (+0200)
Subject: ati-vga: try vga ddc first
X-Git-Tag: rel-1.13.0~30
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=af573dceef7b9a45d13192ec5abf29b73c78540e;p=seabios.git

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>
---

diff --git a/vgasrc/atiext.c b/vgasrc/atiext.c
index 901e82d..71dfa85 100644
--- a/vgasrc/atiext.c
+++ b/vgasrc/atiext.c
@@ -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();