drm/amdgpu: 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>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
index 9191467..3c527cc 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_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>
@@ -48,8 +49,35 @@ struct amdgpu_fbdev {
        struct amdgpu_device *adev;
 };
 
+static int
+amdgpufb_open(struct fb_info *info, int user)
+{
+       struct amdgpu_fbdev *rfbdev = info->par;
+       struct amdgpu_device *adev = rfbdev->adev;
+       int ret = pm_runtime_get_sync(adev->ddev->dev);
+       if (ret < 0 && ret != -EACCES) {
+               pm_runtime_mark_last_busy(adev->ddev->dev);
+               pm_runtime_put_autosuspend(adev->ddev->dev);
+               return ret;
+       }
+       return 0;
+}
+
+static int
+amdgpufb_release(struct fb_info *info, int user)
+{
+       struct amdgpu_fbdev *rfbdev = info->par;
+       struct amdgpu_device *adev = rfbdev->adev;
+
+       pm_runtime_mark_last_busy(adev->ddev->dev);
+       pm_runtime_put_autosuspend(adev->ddev->dev);
+       return 0;
+}
+
 static struct fb_ops amdgpufb_ops = {
        .owner = THIS_MODULE,
+       .fb_open = amdgpufb_open,
+       .fb_release = amdgpufb_release,
        .fb_check_var = drm_fb_helper_check_var,
        .fb_set_par = drm_fb_helper_set_par,
        .fb_fillrect = drm_fb_helper_cfb_fillrect,