edid: prefer standard timings

Windows guests using the "Basic Display Adapter" don't parse the
"Established timings III" block.  They also don't parse any edid
extension.

So prefer the "Standard Timings" block to store the display resolutions
in edid_fill_modes().  Also reorder the mode list, so more exotic
resolutions (specifically the ones which are not supported by vgabios)
are moved down and the remaining ones have a better chance to get one of
the eight slots in the "Standard Timings" block.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-Id: <20210316143812.2363588-6-kraxel@redhat.com>

hw/display/edid-generate.c

@@ -25,19 +25,20 @@ static const struct edid_mode {
     { .xres = 1920,   .yres = 1080,   .dta =  31 },
 
     /* additional standard timings 3 (all @ 60Hz) */
-    { .xres = 1920,   .yres = 1440,   .xtra3 = 11,   .bit = 5 },
     { .xres = 1920,   .yres = 1200,   .xtra3 = 10,   .bit = 0 },
-    { .xres = 1856,   .yres = 1392,   .xtra3 = 10,   .bit = 3 },
-    { .xres = 1792,   .yres = 1344,   .xtra3 = 10,   .bit = 5 },
     { .xres = 1600,   .yres = 1200,   .xtra3 =  9,   .bit = 2 },
     { .xres = 1680,   .yres = 1050,   .xtra3 =  9,   .bit = 5 },
-    { .xres = 1440,   .yres = 1050,   .xtra3 =  8,   .bit = 1 },
     { .xres = 1440,   .yres =  900,   .xtra3 =  8,   .bit = 5 },
-    { .xres = 1360,   .yres =  768,   .xtra3 =  8,   .bit = 7 },
     { .xres = 1280,   .yres = 1024,   .xtra3 =  7,   .bit = 1 },
     { .xres = 1280,   .yres =  960,   .xtra3 =  7,   .bit = 3 },
     { .xres = 1280,   .yres =  768,   .xtra3 =  7,   .bit = 6 },
 
+    { .xres = 1920,   .yres = 1440,   .xtra3 = 11,   .bit = 5 },
+    { .xres = 1856,   .yres = 1392,   .xtra3 = 10,   .bit = 3 },
+    { .xres = 1792,   .yres = 1344,   .xtra3 = 10,   .bit = 5 },
+    { .xres = 1440,   .yres = 1050,   .xtra3 =  8,   .bit = 1 },
+    { .xres = 1360,   .yres =  768,   .xtra3 =  8,   .bit = 7 },
+
     /* established timings (all @ 60Hz) */
     { .xres = 1024,   .yres =  768,   .byte  = 36,   .bit = 3 },
     { .xres =  800,   .yres =  600,   .byte  = 35,   .bit = 0 },
@@ -109,13 +110,13 @@ static void edid_fill_modes(uint8_t *edid, uint8_t *xtra3, uint8_t *dta,
 
         if (mode->byte) {
             edid[mode->byte] |= (1 << mode->bit);
-        } else if (mode->xtra3 && xtra3) {
-            xtra3[mode->xtra3] |= (1 << mode->bit);
         } else if (std < 54) {
             rc = edid_std_mode(edid + std, mode->xres, mode->yres);
             if (rc == 0) {
                 std += 2;
             }
+        } else if (mode->xtra3 && xtra3) {
+            xtra3[mode->xtra3] |= (1 << mode->bit);
         }
 
         if (dta && mode->dta) {