drm/radeon: handle runtime pm in fbcon (v2)

Ported from nouveau.

v2: re-enable runtime autosuspend in the error case

Acked-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_fb.c b/drivers/gpu/drm/radeon/radeon_fb.c
index 0e3143acb565..6b2537d913e8 100644
--- a/drivers/gpu/drm/radeon/radeon_fb.c
+++ b/drivers/gpu/drm/radeon/radeon_fb.c
@@ -26,6 +26,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/fb.h>
+#include <linux/pm_runtime.h>
 
 #include <drm/drmP.h>
 #include <drm/drm_crtc.h>
@@ -47,8 +48,35 @@ struct radeon_fbdev {
         struct radeon_device *rdev;
 };
 
+static int
+radeonfb_open(struct fb_info *info, int user)
+{
+        struct radeon_fbdev *rfbdev = info->par;
+        struct radeon_device *rdev = rfbdev->rdev;
+        int ret = pm_runtime_get_sync(rdev->ddev->dev);
+        if (ret < 0 && ret != -EACCES) {
+                pm_runtime_mark_last_busy(rdev->ddev->dev);
+                pm_runtime_put_autosuspend(rdev->ddev->dev);
+                return ret;
+        }
+        return 0;
+}
+
+static int
+radeonfb_release(struct fb_info *info, int user)
+{
+        struct radeon_fbdev *rfbdev = info->par;
+        struct radeon_device *rdev = rfbdev->rdev;
+
+        pm_runtime_mark_last_busy(rdev->ddev->dev);
+        pm_runtime_put_autosuspend(rdev->ddev->dev);
+        return 0;
+}
+
 static struct fb_ops radeonfb_ops = {
         .owner = THIS_MODULE,
+        .fb_open = radeonfb_open,
+        .fb_release = radeonfb_release,
         .fb_check_var = drm_fb_helper_check_var,
         .fb_set_par = drm_fb_helper_set_par,
         .fb_fillrect = drm_fb_helper_cfb_fillrect,