drm: Add page_flip_target CRTC hook v2

Mostly the same as the existing page_flip hook, but takes an additional
parameter specifying the target vertical blank period when the flip
should take effect.

v2:
* Add curly braces around else statement corresponding to an if block
  with curly braces (Alex Deucher)
* Call drm_crtc_vblank_put in the error case (Daniel Vetter)
* Clarify entry point documentation comment (Daniel Vetter)

Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index b1dbb60..a316f73 100644 (file)
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -5402,6 +5402,7 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
        struct drm_crtc *crtc;
        struct drm_framebuffer *fb = NULL;
        struct drm_pending_vblank_event *e = NULL;
+       u32 target_vblank = 0;
        int ret = -EINVAL;
 
        if (page_flip->flags & ~DRM_MODE_PAGE_FLIP_FLAGS ||
@@ -5415,6 +5416,19 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
        if (!crtc)
                return -ENOENT;
 
+       if (crtc->funcs->page_flip_target) {
+               int r;
+
+               r = drm_crtc_vblank_get(crtc);
+               if (r)
+                       return r;
+
+               target_vblank = drm_crtc_vblank_count(crtc) +
+                       !(page_flip->flags & DRM_MODE_PAGE_FLIP_ASYNC);
+       } else if (crtc->funcs->page_flip == NULL) {
+               return -EINVAL;
+       }
+
        drm_modeset_lock_crtc(crtc, crtc->primary);
        if (crtc->primary->fb == NULL) {
                /* The framebuffer is currently unbound, presumably
@@ -5425,9 +5439,6 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
                goto out;
        }
 
-       if (crtc->funcs->page_flip == NULL)
-               goto out;
-
        fb = drm_framebuffer_lookup(dev, page_flip->fb_id);
        if (!fb) {
                ret = -ENOENT;
@@ -5468,7 +5479,12 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
        }
 
        crtc->primary->old_fb = crtc->primary->fb;
-       ret = crtc->funcs->page_flip(crtc, fb, e, page_flip->flags);
+       if (crtc->funcs->page_flip_target)
+               ret = crtc->funcs->page_flip_target(crtc, fb, e,
+                                                   page_flip->flags,
+                                                   target_vblank);
+       else
+               ret = crtc->funcs->page_flip(crtc, fb, e, page_flip->flags);
        if (ret) {
                if (page_flip->flags & DRM_MODE_PAGE_FLIP_EVENT)
                        drm_event_cancel_free(dev, &e->base);
@@ -5481,6 +5497,8 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
        }
 
 out:
+       if (ret)
+               drm_crtc_vblank_put(crtc);
        if (fb)
                drm_framebuffer_unreference(fb);
        if (crtc->primary->old_fb)

diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 44e0708..3c90563 100644 (file)
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -581,6 +581,24 @@ struct drm_crtc_funcs {
                         uint32_t flags);
 
        /**
+        * @page_flip_target:
+        *
+        * Same as @page_flip but with an additional parameter specifying the
+        * absolute target vertical blank period (as reported by
+        * drm_crtc_vblank_count()) when the flip should take effect.
+        *
+        * Note that the core code calls drm_crtc_vblank_get before this entry
+        * point, and will call drm_crtc_vblank_put if this entry point returns
+        * any non-0 error code. It's the driver's responsibility to call
+        * drm_crtc_vblank_put after this entry point returns 0, typically when
+        * the flip completes.
+        */
+       int (*page_flip_target)(struct drm_crtc *crtc,
+                               struct drm_framebuffer *fb,
+                               struct drm_pending_vblank_event *event,
+                               uint32_t flags, uint32_t target);
+
+       /**
         * @set_property:
         *
         * This is the legacy entry point to update a property attached to the