udlfb: add more comprehensive support for DPMS FB_BLANK_* modes

Fixes earlier problems where monitor would not return from blank

Test with any DisplayLink-based USB 2.0 graphics adapter
sudo nano /sys/class/graphics/fb?/blank
and write out single digit FB_BLANK_* code from include/linux/fb.h

Supports on (0), blank (1), suspend (2,3), powerdown (4)

Signed-off-by: Bernie Thompson <bernie@plugable.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

2 files changed, 74 insertions, 24 deletions

diff --git a/drivers/video/udlfb.c b/drivers/video/udlfb.c
index 087fc9960bb..fecd2d3543b 100644
--- a/drivers/video/udlfb.c
+++ b/drivers/video/udlfb.c
@@ -94,17 +94,39 @@ static char *dlfb_vidreg_unlock(char *buf)
 }
 
 /*
- * On/Off for driving the DisplayLink framebuffer to the display
- *  0x00 H and V sync on
- *  0x01 H and V sync off (screen blank but powered)
- *  0x07 DPMS powerdown (requires modeset to come back)
+ * Map FB_BLANK_* to DisplayLink register
+ * DLReg FB_BLANK_*
+ * ----- -----------------------------
+ *  0x00 FB_BLANK_UNBLANK (0)
+ *  0x01 FB_BLANK (1)
+ *  0x03 FB_BLANK_VSYNC_SUSPEND (2)
+ *  0x05 FB_BLANK_HSYNC_SUSPEND (3)
+ *  0x07 FB_BLANK_POWERDOWN (4) Note: requires modeset to come back
  */
-static char *dlfb_enable_hvsync(char *buf, bool enable)
+static char *dlfb_blanking(char *buf, int fb_blank)
 {
-        if (enable)
-                return dlfb_set_register(buf, 0x1F, 0x00);
-        else
-                return dlfb_set_register(buf, 0x1F, 0x07);
+        u8 reg;
+
+        switch (fb_blank) {
+        case FB_BLANK_POWERDOWN:
+                reg = 0x07;
+                break;
+        case FB_BLANK_HSYNC_SUSPEND:
+                reg = 0x05;
+                break;
+        case FB_BLANK_VSYNC_SUSPEND:
+                reg = 0x03;
+                break;
+        case FB_BLANK_NORMAL:
+                reg = 0x01;
+                break;
+        default:
+                reg = 0x00;
+        }
+
+        buf = dlfb_set_register(buf, 0x1F, reg);
+
+        return buf;
 }
 
 static char *dlfb_set_color_depth(char *buf, u8 selection)
@@ -272,13 +294,15 @@ static int dlfb_set_video_mode(struct dlfb_data *dev,
         wrptr = dlfb_set_base8bpp(wrptr, dev->info->fix.smem_len);
 
         wrptr = dlfb_set_vid_cmds(wrptr, var);
-        wrptr = dlfb_enable_hvsync(wrptr, true);
+        wrptr = dlfb_blanking(wrptr, FB_BLANK_UNBLANK);
         wrptr = dlfb_vidreg_unlock(wrptr);
 
         writesize = wrptr - buf;
 
         retval = dlfb_submit_urb(dev, urb, writesize);
 
+        dev->blank_mode = FB_BLANK_UNBLANK;
+
         return retval;
 }
 
@@ -1039,32 +1063,57 @@ static int dlfb_ops_set_par(struct fb_info *info)
         return result;
 }
 
+/* To fonzi the jukebox (e.g. make blanking changes take effect) */
+static char *dlfb_dummy_render(char *buf)
+{
+        *buf++ = 0xAF;
+        *buf++ = 0x6A; /* copy */
+        *buf++ = 0x00; /* from address*/
+        *buf++ = 0x00;
+        *buf++ = 0x00;
+        *buf++ = 0x01; /* one pixel */
+        *buf++ = 0x00; /* to address */
+        *buf++ = 0x00;
+        *buf++ = 0x00;
+        return buf;
+}
+
 /*
  * In order to come back from full DPMS off, we need to set the mode again
  */
 static int dlfb_ops_blank(int blank_mode, struct fb_info *info)
 {
         struct dlfb_data *dev = info->par;
+        char *bufptr;
+        struct urb *urb;
 
-        if (blank_mode != FB_BLANK_UNBLANK) {
-                char *bufptr;
-                struct urb *urb;
-
-                urb = dlfb_get_urb(dev);
-                if (!urb)
-                        return 0;
+        pr_info("/dev/fb%d FB_BLANK mode %d --> %d\n",
+                info->node, dev->blank_mode, blank_mode);
 
-                bufptr = (char *) urb->transfer_buffer;
-                bufptr = dlfb_vidreg_lock(bufptr);
-                bufptr = dlfb_enable_hvsync(bufptr, false);
-                bufptr = dlfb_vidreg_unlock(bufptr);
+        if ((dev->blank_mode == FB_BLANK_POWERDOWN) &&
+            (blank_mode != FB_BLANK_POWERDOWN)) {
 
-                dlfb_submit_urb(dev, urb, bufptr -
-                                (char *) urb->transfer_buffer);
-        } else {
+                /* returning from powerdown requires a fresh modeset */
                 dlfb_set_video_mode(dev, &info->var);
         }
 
+        urb = dlfb_get_urb(dev);
+        if (!urb)
+                return 0;
+
+        bufptr = (char *) urb->transfer_buffer;
+        bufptr = dlfb_vidreg_lock(bufptr);
+        bufptr = dlfb_blanking(bufptr, blank_mode);
+        bufptr = dlfb_vidreg_unlock(bufptr);
+
+        /* seems like a render op is needed to have blank change take effect */
+        bufptr = dlfb_dummy_render(bufptr);
+
+        dlfb_submit_urb(dev, urb, bufptr -
+                        (char *) urb->transfer_buffer);
+
+        dev->blank_mode = blank_mode;
+
         return 0;
 }
 
diff --git a/include/video/udlfb.h b/include/video/udlfb.h
index 69d485a4a02..c41f308c963 100644
--- a/include/video/udlfb.h
+++ b/include/video/udlfb.h
@@ -50,6 +50,7 @@ struct dlfb_data {
         int base16;
         int base8;
         u32 pseudo_palette[256];
+        int blank_mode; /*one of FB_BLANK_ */
         /* blit-only rendering path metrics, exposed through sysfs */
         atomic_t bytes_rendered; /* raw pixel-bytes driver asked to render */
         atomic_t bytes_identical; /* saved effort with backbuffer comparison */