vga16fb, drm: vga16fb->drm handoff

let vga16fb claim 0xA0000+0x10000 region as its aperture;
drm drivers don't use it, so we have to detect it and kick
vga16fb manually - but only if drm is driving the primary card

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: James Simmons <jsimmons@infradead.org>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 30 insertions, 10 deletions

diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index 7cfcd716fd5f..e08b7b5cb326 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -1500,19 +1500,26 @@ static bool fb_do_apertures_overlap(struct apertures_struct *gena,
         return false;
 }
 
-void remove_conflicting_framebuffers(struct apertures_struct *a, const char *name)
+#define VGA_FB_PHYS 0xA0000
+void remove_conflicting_framebuffers(struct apertures_struct *a,
+                                     const char *name, bool primary)
 {
         int i;
 
         /* check all firmware fbs and kick off if the base addr overlaps */
         for (i = 0 ; i < FB_MAX; i++) {
+                struct apertures_struct *gen_aper;
                 if (!registered_fb[i])
                         continue;
 
                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
                         continue;
 
-                if (fb_do_apertures_overlap(registered_fb[i]->apertures, a)) {
+                gen_aper = registered_fb[i]->apertures;
+                if (fb_do_apertures_overlap(gen_aper, a) ||
+                        (primary && gen_aper && gen_aper->count &&
+                         gen_aper->ranges[0].base == VGA_FB_PHYS)) {
+
                         printk(KERN_ERR "fb: conflicting fb hw usage "
                                "%s vs %s - removing generic driver\n",
                                name, registered_fb[i]->fix.id);
@@ -1545,7 +1552,8 @@ register_framebuffer(struct fb_info *fb_info)
         if (fb_check_foreignness(fb_info))
                 return -ENOSYS;
 
-        remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id);
+        remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
+                                         fb_is_primary_device(fb_info));
 
         num_registered_fb++;
         for (i = 0 ; i < FB_MAX; i++)
diff --git a/drivers/video/vga16fb.c b/drivers/video/vga16fb.c
index bf638a47a5b3..149c47ac7e93 100644
--- a/drivers/video/vga16fb.c
+++ b/drivers/video/vga16fb.c
@@ -1263,10 +1263,19 @@ static void vga16fb_imageblit(struct fb_info *info, const struct fb_image *image
                 vga_imageblit_color(info, image);
 }
 
+static void vga16fb_destroy(struct fb_info *info)
+{
+        iounmap(info->screen_base);
+        fb_dealloc_cmap(&info->cmap);
+        /* XXX unshare VGA regions */
+        framebuffer_release(info);
+}
+
 static struct fb_ops vga16fb_ops = {
         .owner          = THIS_MODULE,
         .fb_open        = vga16fb_open,
         .fb_release     = vga16fb_release,
+        .fb_destroy     = vga16fb_destroy,
         .fb_check_var   = vga16fb_check_var,
         .fb_set_par     = vga16fb_set_par,
         .fb_setcolreg   = vga16fb_setcolreg,
@@ -1306,6 +1315,11 @@ static int __devinit vga16fb_probe(struct platform_device *dev)
                 ret = -ENOMEM;
                 goto err_fb_alloc;
         }
+        info->apertures = alloc_apertures(1);
+        if (!info->apertures) {
+                ret = -ENOMEM;
+                goto err_ioremap;
+        }
 
         /* XXX share VGA_FB_PHYS and I/O region with vgacon and others */
         info->screen_base = (void __iomem *)VGA_MAP_MEM(VGA_FB_PHYS, 0);
@@ -1335,7 +1349,7 @@ static int __devinit vga16fb_probe(struct platform_device *dev)
         info->fix = vga16fb_fix;
         /* supports rectangles with widths of multiples of 8 */
         info->pixmap.blit_x = 1 << 7 | 1 << 15 | 1 << 23 | 1 << 31;
-        info->flags = FBINFO_FLAG_DEFAULT |
+        info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE |
                 FBINFO_HWACCEL_YPAN;
 
         i = (info->var.bits_per_pixel == 8) ? 256 : 16;
@@ -1354,6 +1368,9 @@ static int __devinit vga16fb_probe(struct platform_device *dev)
 
         vga16fb_update_fix(info);
 
+        info->apertures->ranges[0].base = VGA_FB_PHYS;
+        info->apertures->ranges[0].size = VGA_FB_PHYS_LEN;
+
         if (register_framebuffer(info) < 0) {
                 printk(KERN_ERR "vga16fb: unable to register framebuffer\n");
                 ret = -EINVAL;
@@ -1380,13 +1397,8 @@ static int vga16fb_remove(struct platform_device *dev)
 {
         struct fb_info *info = platform_get_drvdata(dev);
 
-        if (info) {
+        if (info)
                 unregister_framebuffer(info);
-                iounmap(info->screen_base);
-                fb_dealloc_cmap(&info->cmap);
-        /* XXX unshare VGA regions */
-                framebuffer_release(info);
-        }
 
         return 0;
 }