ps3fb: add virtual screen and panning support

ps3fb: Add virtual screen and panning support:
  - The vertical virtual screen size is limited by the amount of memory
    reserved for ps3fb,
  - The horizontal virtual screen size is limited to the fullscreen width,
  - Advertise that we support panning, so fbcon will use it if the virtual
    screen is enabled.
    Enabling a virtual screen (using `fbset -vyres nnn') can speed up text
    console scrolling by a factor of 10-15, depending on the video mode.

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, 40 insertions, 25 deletions

diff --git a/drivers/video/ps3fb.c b/drivers/video/ps3fb.c
index 88e15d4b5684..64af173d18f9 100644
--- a/drivers/video/ps3fb.c
+++ b/drivers/video/ps3fb.c
@@ -141,6 +141,7 @@ struct ps3fb_par {
         unsigned int height;
         unsigned long full_offset;      /* start of fullscreen DDR fb */
         unsigned long fb_offset;        /* start of actual DDR fb */
+        unsigned long pan_offset;
 };
 
 struct ps3fb_res_table {
@@ -440,8 +441,8 @@ static int ps3fb_sync(struct fb_info *info, u32 frame)
         base = frame * yres * line_length;
 
         ps3fb_sync_image(info->device, base + par->full_offset,
-                         base + par->fb_offset, base, par->width, par->height,
-                         line_length);
+                         base + par->fb_offset, base + par->pan_offset,
+                         par->width, par->height, line_length);
 
 out:
         release_console_sem();
@@ -488,27 +489,23 @@ static int ps3fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
         if (!mode)
                 return -EINVAL;
 
-        /*
-         *  FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal!
-         *  as FB_VMODE_SMOOTH_XPAN is only used internally
-         */
+        /* Virtual screen */
+        if (var->xres_virtual < var->xres)
+                var->xres_virtual = var->xres;
+        if (var->yres_virtual < var->yres)
+                var->yres_virtual = var->yres;
 
-        if (var->vmode & FB_VMODE_CONUPDATE) {
-                var->vmode |= FB_VMODE_YWRAP;
-                var->xoffset = info->var.xoffset;
-                var->yoffset = info->var.yoffset;
-        }
-
-        /* Virtual screen and panning are not supported */
-        if (var->xres_virtual > var->xres || var->yres_virtual > var->yres ||
-            var->xoffset || var->yoffset) {
+        if (var->xres_virtual > line_length / BPP) {
                 dev_dbg(info->device,
-                        "Virtual screen and panning are not supported\n");
+                        "Horizontal virtual screen size too large\n");
                 return -EINVAL;
         }
 
-        var->xres_virtual = var->xres;
-        var->yres_virtual = var->yres;
+        if (var->xoffset + var->xres > var->xres_virtual ||
+            var->yoffset + var->yres > var->yres_virtual) {
+                dev_dbg(info->device, "panning out-of-range\n");
+                return -EINVAL;
+        }
 
         /* We support ARGB8888 only */
         if (var->bits_per_pixel > 32 || var->grayscale ||
@@ -543,7 +540,7 @@ static int ps3fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
         }
 
         /* Memory limit */
-        if (var->yres * line_length > ps3fb.xdr_size) {
+        if (var->yres_virtual * line_length > ps3fb.xdr_size) {
                 dev_dbg(info->device, "Not enough memory\n");
                 return -ENOMEM;
         }
@@ -561,7 +558,7 @@ static int ps3fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 static int ps3fb_set_par(struct fb_info *info)
 {
         struct ps3fb_par *par = info->par;
-        unsigned int mode, lines, maxlines;
+        unsigned int mode, line_length, lines, maxlines;
         int i;
         unsigned long offset, dst;
 
@@ -569,7 +566,7 @@ static int ps3fb_set_par(struct fb_info *info)
                 info->var.xres, info->var.xres_virtual,
                 info->var.yres, info->var.yres_virtual, info->var.pixclock);
 
-        mode = ps3fb_find_mode(&info->var, &info->fix.line_length);
+        mode = ps3fb_find_mode(&info->var, &line_length);
         if (!mode)
                 return -EINVAL;
 
@@ -578,6 +575,10 @@ static int ps3fb_set_par(struct fb_info *info)
 
         info->fix.smem_start = virt_to_abs(ps3fb.xdr_ea);
         info->fix.smem_len = ps3fb.xdr_size;
+        info->fix.xpanstep = info->var.xres_virtual > info->var.xres ? 1 : 0;
+        info->fix.ypanstep = info->var.yres_virtual > info->var.yres ? 1 : 0;
+        info->fix.line_length = line_length;
+
         info->screen_base = (char __iomem *)ps3fb.xdr_ea;
 
         par->num_frames = info->fix.smem_len/
@@ -591,6 +592,8 @@ static int ps3fb_set_par(struct fb_info *info)
         offset = VP_OFF(i);
         par->fb_offset = GPU_ALIGN_UP(offset);
         par->full_offset = par->fb_offset - offset;
+        par->pan_offset = info->var.yoffset * line_length +
+                          info->var.xoffset * BPP;
 
         if (par->new_mode_id != par->mode_id) {
                 if (ps3av_set_video_mode(par->new_mode_id)) {
@@ -607,11 +610,11 @@ static int ps3fb_set_par(struct fb_info *info)
         lines = ps3fb_res[i].yres * par->num_frames;
         if (par->full_offset)
                 lines++;
-        maxlines = ps3fb.xdr_size / info->fix.line_length;
-        for (dst = 0; lines; dst += maxlines * info->fix.line_length) {
+        maxlines = ps3fb.xdr_size / line_length;
+        for (dst = 0; lines; dst += maxlines * line_length) {
                 unsigned int l = min(lines, maxlines);
                 ps3fb_sync_image(info->device, 0, dst, 0, ps3fb_res[i].xres, l,
-                                 info->fix.line_length);
+                                 line_length);
                 lines -= l;
         }
 
@@ -641,6 +644,16 @@ static int ps3fb_setcolreg(unsigned int regno, unsigned int red,
         return 0;
 }
 
+static int ps3fb_pan_display(struct fb_var_screeninfo *var,
+                             struct fb_info *info)
+{
+        struct ps3fb_par *par = info->par;
+
+        par->pan_offset = var->yoffset * info->fix.line_length +
+                          var->xoffset * BPP;
+        return 0;
+}
+
     /*
      *  As we have a virtual frame buffer, we need our own mmap function
      */
@@ -965,6 +978,7 @@ static struct fb_ops ps3fb_ops = {
         .fb_check_var   = ps3fb_check_var,
         .fb_set_par     = ps3fb_set_par,
         .fb_setcolreg   = ps3fb_setcolreg,
+        .fb_pan_display = ps3fb_pan_display,
         .fb_fillrect    = sys_fillrect,
         .fb_copyarea    = sys_copyarea,
         .fb_imageblit   = sys_imageblit,
@@ -1115,7 +1129,8 @@ static int __devinit ps3fb_probe(struct ps3_system_bus_device *dev)
         info->fix.smem_start = virt_to_abs(ps3fb.xdr_ea);
         info->fix.smem_len = ps3fb.xdr_size;
         info->pseudo_palette = par->pseudo_palette;
-        info->flags = FBINFO_DEFAULT | FBINFO_READS_FAST;
+        info->flags = FBINFO_DEFAULT | FBINFO_READS_FAST |
+                      FBINFO_HWACCEL_XPAN | FBINFO_HWACCEL_YPAN;
 
         retval = fb_alloc_cmap(&info->cmap, 256, 0);
         if (retval < 0)