udlfb: Correct sub-optimal resolution selection.

The situation in which the problem occurred was with a Plugable UGA-2K-A
connected to a Samsung EX2220X display. The driver indicates that
1920x1080 is a valid mode (the first mode available, in fact), but
proceeds to set the framebuffer size to 1600x1200.

The patch corrects what seems to be a logic error, regarding unsetting
the FB_MISC_1ST_DETAIL flag, if the first (top/best) mode is invalid.
The existing code unset the flag if ANY mode was invalid.

Signed-off-by: William Katsak <william.katsak@alcatel-lucent.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/drivers/video/udlfb.c b/drivers/video/udlfb.c
index 52b0f3e..816a4fd 100644 (file)
--- a/drivers/video/udlfb.c
+++ b/drivers/video/udlfb.c
@@ -1233,8 +1233,12 @@ static int dlfb_setup_modes(struct dlfb_data *dev,
                        if (dlfb_is_valid_mode(&info->monspecs.modedb[i], info))
                                fb_add_videomode(&info->monspecs.modedb[i],
                                        &info->modelist);
-                       else /* if we've removed top/best mode */
-                               info->monspecs.misc &= ~FB_MISC_1ST_DETAIL;
+                       else {
+                               if (i == 0)
+                                       /* if we've removed top/best mode */
+                                       info->monspecs.misc
+                                               &= ~FB_MISC_1ST_DETAIL;
+                       }
                }
 
                default_vmode = fb_find_best_display(&info->monspecs,