drm: platform multi-device support

Include the device id in the bus-id to give userspace a way to open
the correct "cardN" when there are multiple device instances.

Signed-off-by: Rob Clark <rob@ti.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/gpu/drm/drm_platform.c b/drivers/gpu/drm/drm_platform.c
index 7223f06d8e58..2a8b6265ad3d 100644
--- a/drivers/gpu/drm/drm_platform.c
+++ b/drivers/gpu/drm/drm_platform.c
@@ -123,14 +123,15 @@ static int drm_platform_set_busid(struct drm_device *dev, struct drm_master *mas
 {
         int len, ret;
 
-        master->unique_len = 10 + strlen(dev->platformdev->name);
+        master->unique_len = 13 + strlen(dev->platformdev->name);
+        master->unique_size = master->unique_len;
         master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
 
         if (master->unique == NULL)
                 return -ENOMEM;
 
         len = snprintf(master->unique, master->unique_len,
-                       "platform:%s", dev->platformdev->name);
+                        "platform:%s:%02d", dev->platformdev->name, dev->platformdev->id);
 
         if (len > master->unique_len) {
                 DRM_ERROR("Unique buffer overflowed\n");