ps3fb: add support for configurable black borders

Allow all video modes where the visible resolution plus the black borders
matches a native resolution

Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 50 insertions, 21 deletions

diff --git a/drivers/video/ps3fb.c b/drivers/video/ps3fb.c
index be9f70cd0062..b23d64070eef 100644
--- a/drivers/video/ps3fb.c
+++ b/drivers/video/ps3fb.c
@@ -270,32 +270,57 @@ module_param(ps3fb_mode, int, 0);
 
 static char *mode_option __devinitdata;
 
-static unsigned int ps3fb_find_mode(const struct fb_var_screeninfo *var,
+static int ps3fb_cmp_mode(const struct fb_videomode *vmode,
+                          const struct fb_var_screeninfo *var)
+{
+        /* resolution + black border must match a native resolution */
+        if (vmode->left_margin + vmode->xres + vmode->right_margin !=
+            var->left_margin + var->xres + var->right_margin ||
+            vmode->upper_margin + vmode->yres + vmode->lower_margin !=
+            var->upper_margin + var->yres + var->lower_margin)
+                return -1;
+
+        /* minimum limits for margins */
+        if (vmode->left_margin > var->left_margin ||
+            vmode->right_margin > var->right_margin ||
+            vmode->upper_margin > var->upper_margin ||
+            vmode->lower_margin > var->lower_margin)
+                return -1;
+
+        /* these fields must match exactly */
+        if (vmode->pixclock != var->pixclock ||
+            vmode->hsync_len != var->hsync_len ||
+            vmode->vsync_len != var->vsync_len ||
+            vmode->sync != var->sync ||
+            vmode->vmode != (var->vmode & FB_VMODE_MASK))
+                return -1;
+
+        return 0;
+}
+
+static unsigned int ps3fb_find_mode(struct fb_var_screeninfo *var,
                                     u32 *ddr_line_length, u32 *xdr_line_length)
 {
-        unsigned int i, fi, mode;
-
-        for (i = 0; i < ARRAY_SIZE(ps3fb_modedb); i++)
-                if (var->xres == ps3fb_modedb[i].xres &&
-                    var->yres == ps3fb_modedb[i].yres &&
-                    var->pixclock == ps3fb_modedb[i].pixclock &&
-                    var->hsync_len == ps3fb_modedb[i].hsync_len &&
-                    var->vsync_len == ps3fb_modedb[i].vsync_len &&
-                    var->left_margin == ps3fb_modedb[i].left_margin &&
-                    var->right_margin == ps3fb_modedb[i].right_margin &&
-                    var->upper_margin == ps3fb_modedb[i].upper_margin &&
-                    var->lower_margin == ps3fb_modedb[i].lower_margin &&
-                    var->sync == ps3fb_modedb[i].sync &&
-                    (var->vmode & FB_VMODE_MASK) == ps3fb_modedb[i].vmode)
+        unsigned int i, mode;
+
+        for (i = PS3AV_MODE_1080P50; i < ARRAY_SIZE(ps3fb_modedb); i++)
+                if (!ps3fb_cmp_mode(&ps3fb_modedb[i], var))
                         goto found;
 
         pr_debug("ps3fb_find_mode: mode not found\n");
         return 0;
 
 found:
-        /* Cropped broadcast modes use the full line length */
-        fi = i < PS3AV_MODE_1080P50 ? i + PS3AV_MODE_WUXGA : i;
-        *ddr_line_length = ps3fb_modedb[fi].xres * BPP;
+        *ddr_line_length = ps3fb_modedb[i].xres * BPP;
+
+        if (!var->xres) {
+                var->xres = 1;
+                var->right_margin--;
+        }
+        if (!var->yres) {
+                var->yres = 1;
+                var->lower_margin--;
+        }
 
         if (ps3_compare_firmware_version(1, 9, 0) >= 0) {
                 *xdr_line_length = GPU_ALIGN_UP(max(var->xres,
@@ -305,10 +330,14 @@ found:
         } else
                 *xdr_line_length = *ddr_line_length;
 
-        /* Full broadcast modes have the full mode bit set */
         mode = i+1;
-        if (mode > PS3AV_MODE_WUXGA)
-                mode = (mode - PS3AV_MODE_WUXGA) | PS3AV_MODE_FULL;
+        if (mode > PS3AV_MODE_WUXGA) {
+                mode -= PS3AV_MODE_WUXGA;
+                /* Full broadcast modes have the full mode bit set */
+                if (ps3fb_modedb[i].xres == var->xres &&
+                    ps3fb_modedb[i].yres == var->yres)
+                        mode |= PS3AV_MODE_FULL;
+        }
 
         pr_debug("ps3fb_find_mode: mode %u\n", mode);