freescale DIU: add virtual resolution and panning support

Application can now have the virtual resoltuion and use FBIOPAN_DISPLAY
ioctl to pan.

Signed-off-by: York Sun <yorksun@freescale.com>
Cc: Kumar Gala <galak@gate.crashing.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/fsl-diu-fb.c

@@ -777,6 +777,22 @@ static void unmap_video_memory(struct fb_info *info)
 	info->fix.smem_len = 0;
 }
 
+/*
+ * Using the fb_var_screeninfo in fb_info we set the aoi of this
+ * particular framebuffer. It is a light version of fsl_diu_set_par.
+ */
+static int fsl_diu_set_aoi(struct fb_info *info)
+{
+	struct fb_var_screeninfo *var = &info->var;
+	struct mfb_info *mfbi = info->par;
+	struct diu_ad *ad = mfbi->ad;
+
+	/* AOI should not be greater than display size */
+	ad->offset_xyi = cpu_to_le32((var->yoffset << 16) | var->xoffset);
+	ad->offset_xyd = cpu_to_le32((mfbi->y_aoi_d << 16) | mfbi->x_aoi_d);
+	return 0;
+}
+
 /*
  * Using the fb_var_screeninfo in fb_info we set the resolution of this
  * particular framebuffer. This function alters the fb_fix_screeninfo stored
@@ -817,11 +833,11 @@ static int fsl_diu_set_par(struct fb_info *info)
 		diu_ops.get_pixel_format(var->bits_per_pixel,
 					 machine_data->monitor_port);
 	ad->addr    = cpu_to_le32(info->fix.smem_start);
-	ad->src_size_g_alpha = cpu_to_le32((var->yres << 12) |
-				var->xres) | mfbi->g_alpha;
-	/* fix me. AOI should not be greater than display size */
+	ad->src_size_g_alpha = cpu_to_le32((var->yres_virtual << 12) |
+				var->xres_virtual) | mfbi->g_alpha;
+	/* AOI should not be greater than display size */
 	ad->aoi_size 	= cpu_to_le32((var->yres << 16) | var->xres);
-	ad->offset_xyi = 0;
+	ad->offset_xyi = cpu_to_le32((var->yoffset << 16) | var->xoffset);
 	ad->offset_xyd = cpu_to_le32((mfbi->y_aoi_d << 16) | mfbi->x_aoi_d);
 
 	/* Disable chroma keying function */
@@ -921,6 +937,8 @@ static int fsl_diu_pan_display(struct fb_var_screeninfo *var,
 	else
 		info->var.vmode &= ~FB_VMODE_YWRAP;
 
+	fsl_diu_set_aoi(info);
+
 	return 0;
 }
 
@@ -989,7 +1007,7 @@ static int fsl_diu_ioctl(struct fb_info *info, unsigned int cmd,
 		pr_debug("set AOI display offset of index %d to (%d,%d)\n",
 				 mfbi->index, aoi_d.x_aoi_d, aoi_d.y_aoi_d);
 		fsl_diu_check_var(&info->var, info);
-		fsl_diu_set_par(info);
+		fsl_diu_set_aoi(info);
 		break;
 	case MFB_GET_AOID:
 		aoi_d.x_aoi_d = mfbi->x_aoi_d;