1 files changed, 79 insertions, 42 deletions

diff --git a/drivers/video/pxafb.c b/drivers/video/pxafb.c
index 825b665245bb..0764759a2eed 100644
--- a/drivers/video/pxafb.c
+++ b/drivers/video/pxafb.c
@@ -627,7 +627,12 @@ static void overlay1fb_enable(struct pxafb_layer *ofb)
 
 static void overlay1fb_disable(struct pxafb_layer *ofb)
 {
-        uint32_t lccr5 = lcd_readl(ofb->fbi, LCCR5);
+        uint32_t lccr5;
+
+        if (!(lcd_readl(ofb->fbi, OVL1C1) & OVLxC1_OEN))
+                return;
+
+        lccr5 = lcd_readl(ofb->fbi, LCCR5);
 
         lcd_writel(ofb->fbi, OVL1C1, ofb->control[0] & ~OVLxC1_OEN);
 
@@ -685,7 +690,12 @@ static void overlay2fb_enable(struct pxafb_layer *ofb)
 
 static void overlay2fb_disable(struct pxafb_layer *ofb)
 {
-        uint32_t lccr5 = lcd_readl(ofb->fbi, LCCR5);
+        uint32_t lccr5;
+
+        if (!(lcd_readl(ofb->fbi, OVL2C1) & OVLxC1_OEN))
+                return;
+
+        lccr5 = lcd_readl(ofb->fbi, LCCR5);
 
         lcd_writel(ofb->fbi, OVL2C1, ofb->control[0] & ~OVLxC1_OEN);
 
@@ -720,12 +730,10 @@ static int overlayfb_open(struct fb_info *info, int user)
         if (user == 0)
                 return -ENODEV;
 
-        /* allow only one user at a time */
-        if (atomic_inc_and_test(&ofb->usage))
-                return -EBUSY;
+        if (ofb->usage++ == 0)
+                /* unblank the base framebuffer */
+                fb_blank(&ofb->fbi->fb, FB_BLANK_UNBLANK);
 
-        /* unblank the base framebuffer */
-        fb_blank(&ofb->fbi->fb, FB_BLANK_UNBLANK);
         return 0;
 }
 
@@ -733,12 +741,15 @@ static int overlayfb_release(struct fb_info *info, int user)
 {
         struct pxafb_layer *ofb = (struct pxafb_layer*) info;
 
-        atomic_dec(&ofb->usage);
-        ofb->ops->disable(ofb);
+        if (ofb->usage == 1) {
+                ofb->ops->disable(ofb);
+                ofb->fb.var.height      = -1;
+                ofb->fb.var.width       = -1;
+                ofb->fb.var.xres = ofb->fb.var.xres_virtual = 0;
+                ofb->fb.var.yres = ofb->fb.var.yres_virtual = 0;
 
-        free_pages_exact(ofb->video_mem, ofb->video_mem_size);
-        ofb->video_mem = NULL;
-        ofb->video_mem_size = 0;
+                ofb->usage--;
+        }
         return 0;
 }
 
@@ -794,7 +805,7 @@ static int overlayfb_check_var(struct fb_var_screeninfo *var,
         return 0;
 }
 
-static int overlayfb_map_video_memory(struct pxafb_layer *ofb)
+static int overlayfb_check_video_memory(struct pxafb_layer *ofb)
 {
         struct fb_var_screeninfo *var = &ofb->fb.var;
         int pfor = NONSTD_TO_PFOR(var->nonstd);
@@ -812,27 +823,11 @@ static int overlayfb_map_video_memory(struct pxafb_layer *ofb)
 
         size = PAGE_ALIGN(ofb->fb.fix.line_length * var->yres_virtual);
 
-        /* don't re-allocate if the original video memory is enough */
         if (ofb->video_mem) {
                 if (ofb->video_mem_size >= size)
                         return 0;
-
-                free_pages_exact(ofb->video_mem, ofb->video_mem_size);
         }
-
-        ofb->video_mem = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
-        if (ofb->video_mem == NULL)
-                return -ENOMEM;
-
-        ofb->video_mem_phys = virt_to_phys(ofb->video_mem);
-        ofb->video_mem_size = size;
-
-        mutex_lock(&ofb->fb.mm_lock);
-        ofb->fb.fix.smem_start  = ofb->video_mem_phys;
-        ofb->fb.fix.smem_len    = ofb->fb.fix.line_length * var->yres_virtual;
-        mutex_unlock(&ofb->fb.mm_lock);
-        ofb->fb.screen_base     = ofb->video_mem;
-        return 0;
+        return -EINVAL;
 }
 
 static int overlayfb_set_par(struct fb_info *info)
@@ -841,7 +836,7 @@ static int overlayfb_set_par(struct fb_info *info)
         struct fb_var_screeninfo *var = &info->var;
         int xpos, ypos, pfor, bpp, ret;
 
-        ret = overlayfb_map_video_memory(ofb);
+        ret = overlayfb_check_video_memory(ofb);
         if (ret)
                 return ret;
 
@@ -891,7 +886,7 @@ static void __devinit init_pxafb_overlay(struct pxafb_info *fbi,
 
         ofb->id = id;
         ofb->ops = &ofb_ops[id];
-        atomic_set(&ofb->usage, 0);
+        ofb->usage = 0;
         ofb->fbi = fbi;
         init_completion(&ofb->branch_done);
 }
@@ -904,20 +899,54 @@ static inline int pxafb_overlay_supported(void)
         return 0;
 }
 
-static int __devinit pxafb_overlay_init(struct pxafb_info *fbi)
+static int __devinit pxafb_overlay_map_video_memory(struct pxafb_info *pxafb,
+        struct pxafb_layer *ofb)
+{
+        /* We assume that user will use at most video_mem_size for overlay fb,
+         * anyway, it's useless to use 16bpp main plane and 24bpp overlay
+         */
+        ofb->video_mem = alloc_pages_exact(PAGE_ALIGN(pxafb->video_mem_size),
+                GFP_KERNEL | __GFP_ZERO);
+        if (ofb->video_mem == NULL)
+                return -ENOMEM;
+
+        ofb->video_mem_phys = virt_to_phys(ofb->video_mem);
+        ofb->video_mem_size = PAGE_ALIGN(pxafb->video_mem_size);
+
+        mutex_lock(&ofb->fb.mm_lock);
+        ofb->fb.fix.smem_start  = ofb->video_mem_phys;
+        ofb->fb.fix.smem_len    = pxafb->video_mem_size;
+        mutex_unlock(&ofb->fb.mm_lock);
+
+        ofb->fb.screen_base     = ofb->video_mem;
+
+        return 0;
+}
+
+static void __devinit pxafb_overlay_init(struct pxafb_info *fbi)
 {
         int i, ret;
 
         if (!pxafb_overlay_supported())
-                return 0;
+                return;
 
         for (i = 0; i < 2; i++) {
-                init_pxafb_overlay(fbi, &fbi->overlay[i], i);
-                ret = register_framebuffer(&fbi->overlay[i].fb);
+                struct pxafb_layer *ofb = &fbi->overlay[i];
+                init_pxafb_overlay(fbi, ofb, i);
+                ret = register_framebuffer(&ofb->fb);
                 if (ret) {
                         dev_err(fbi->dev, "failed to register overlay %d\n", i);
-                        return ret;
+                        continue;
+                }
+                ret = pxafb_overlay_map_video_memory(fbi, ofb);
+                if (ret) {
+                        dev_err(fbi->dev,
+                                "failed to map video memory for overlay %d\n",
+                                i);
+                        unregister_framebuffer(&ofb->fb);
+                        continue;
                 }
+                ofb->registered = 1;
         }
 
         /* mask all IU/BS/EOF/SOF interrupts */
@@ -926,7 +955,6 @@ static int __devinit pxafb_overlay_init(struct pxafb_info *fbi)
         /* place overlay(s) on top of base */
         fbi->lccr0 |= LCCR0_OUC;
         pr_info("PXA Overlay driver loaded successfully!\n");
-        return 0;
 }
 
 static void __devexit pxafb_overlay_exit(struct pxafb_info *fbi)
@@ -936,8 +964,15 @@ static void __devexit pxafb_overlay_exit(struct pxafb_info *fbi)
         if (!pxafb_overlay_supported())
                 return;
 
-        for (i = 0; i < 2; i++)
-                unregister_framebuffer(&fbi->overlay[i].fb);
+        for (i = 0; i < 2; i++) {
+                struct pxafb_layer *ofb = &fbi->overlay[i];
+                if (ofb->registered) {
+                        if (ofb->video_mem)
+                                free_pages_exact(ofb->video_mem,
+                                        ofb->video_mem_size);
+                        unregister_framebuffer(&ofb->fb);
+                }
+        }
 }
 #else
 static inline void pxafb_overlay_init(struct pxafb_info *fbi) {}
@@ -1368,7 +1403,8 @@ static int pxafb_activate_var(struct fb_var_screeninfo *var,
             (lcd_readl(fbi, LCCR3) != fbi->reg_lccr3) ||
             (lcd_readl(fbi, LCCR4) != fbi->reg_lccr4) ||
             (lcd_readl(fbi, FDADR0) != fbi->fdadr[0]) ||
-            (lcd_readl(fbi, FDADR1) != fbi->fdadr[1]))
+            ((fbi->lccr0 & LCCR0_SDS) &&
+            (lcd_readl(fbi, FDADR1) != fbi->fdadr[1])))
                 pxafb_schedule_work(fbi, C_REENABLE);
 
         return 0;
@@ -1420,7 +1456,8 @@ static void pxafb_enable_controller(struct pxafb_info *fbi)
         lcd_writel(fbi, LCCR0, fbi->reg_lccr0 & ~LCCR0_ENB);
 
         lcd_writel(fbi, FDADR0, fbi->fdadr[0]);
-        lcd_writel(fbi, FDADR1, fbi->fdadr[1]);
+        if (fbi->lccr0 & LCCR0_SDS)
+                lcd_writel(fbi, FDADR1, fbi->fdadr[1]);
         lcd_writel(fbi, LCCR0, fbi->reg_lccr0 | LCCR0_ENB);
 }