[PATCH] fbdev: Workaround for buggy EDID blocks
Some EDID blocks set the flag "prefer first detailed timing" without providing
any detailed timing at all. Clear this flag if the block does not provide
detailed timings.
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/video/fbmon.c b/drivers/video/fbmon.c
index 713226c..442a52d 100644
--- a/drivers/video/fbmon.c
+++ b/drivers/video/fbmon.c
@@ -827,7 +827,7 @@
void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
{
unsigned char *block;
- int i;
+ int i, found = 0;
if (edid == NULL)
return;
@@ -869,6 +869,22 @@
get_monspecs(edid, specs);
specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
+
+ /*
+ * Workaround for buggy EDIDs that sets that the first
+ * detailed timing is preferred but has not detailed
+ * timing specified
+ */
+ for (i = 0; i < specs->modedb_len; i++) {
+ if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found)
+ specs->misc &= ~FB_MISC_1ST_DETAIL;
+
DPRINTK("========================================\n");
}