From: Zhao Junwang <zhjwpku@xxxxxxxxx>
This is the equivalent helper to drm_plane_helper_check_update
for legacy drivers, but using atomic state to check things.
Motivated by the atomic conversion of the bochs driver.
v2: according to Daniel's comment
-polish the kerneldoc comment to match the signatures
-crtc->mode is legacy state, we need to look at crtc_state
instead
according to Maarten's comment
-there is no need for can_update_disabled in the atomic world,
so, we can delete that parameter
v3: according to Daniel's comment
-this function call can't fail, add a WARN_ON
-use drm_atomic_get_existing_crtc_state
according to Maarten's comment
-kill off the plane parameter and rename state to plane_state
-do not handling NULL, i.e. no need to check plane_state in
atomic.
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Zhao Junwang <zhjwpku@xxxxxxxxx>
---
drivers/gpu/drm/drm_atomic_helper.c | 56 +++++++++++++++++++++++++++++++++++
drivers/gpu/drm/drm_plane_helper.c | 6 ++++
include/drm/drm_atomic_helper.h | 5 ++++
3 files changed, 67 insertions(+)
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 536ae4d..eaef689 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -1336,6 +1336,62 @@ void drm_atomic_helper_swap_state(struct drm_device *dev,
EXPORT_SYMBOL(drm_atomic_helper_swap_state);
/**
+ * drm_atomic_helper_plane_check_update
+ * @plane_state: drm plane state
+ * @min_scale: minimum @src:@dest scaling factor in 16.16 fixed point
+ * @max_scale: maximum @src:@dest scaling factor in 16.16 fixed point
+ * @can_position: is it legal to position the plane such that it
+ * doesn't cover the entire crtc? This will generally
+ * only be false for primary planes.
+ *
+ * This provides a helper to be used in a driver's plane atomic_check
+ * callback. It is the atomic equivalent of
+ * drm_plane_helper_check_update() and has the exact same semantics,
+ * except that it looks at the atomic CRTC state in the atomic update
+ * instead of legacy state directly embedded in struct &drm_crtc.
+ *
+ * RETURNS:
+ * Zero on success, error code on failure
+ */
+int drm_atomic_helper_plane_check_update(struct drm_plane_state *plane_state,
+ int min_scale,
+ int max_scale,
+ bool can_position,
+ bool *visible)
+{
+ struct drm_crtc_state *crtc_state;
+ crtc_state = drm_atomic_get_existing_crtc_state(plane_state->state,
+ plane_state->crtc);
+ if (WARN_ON(IS_ERR(crtc_state)))
+ return PTR_ERR(crtc_state);
+
+ struct drm_rect src = {
+ .x1 = plane_state->src_x,
+ .y1 = plane_state->src_y,
+ .x2 = plane_state->src_x + plane_state->src_w,
+ .y2 = plane_state->src_y + plane_state->src_h,
+ };
+ struct drm_rect dest = {
+ .x1 = plane_state->crtc_x,
+ .y1 = plane_state->crtc_y,
+ .x2 = plane_state->crtc_x + plane_state->crtc_w,
+ .y2 = plane_state->crtc_y + plane_state->crtc_h,
+ };
+ const struct drm_rect clip = {
+ .x2 = crtc_state->mode.hdisplay,
+ .y2 = crtc_state->mode.vdisplay,
+ };
+
+ return drm_plane_helper_check_update(plane_state->plane,
+ plane_state->crtc,
+ plane_state->fb,
+ &src, &dest, &clip,
+ min_scale, max_scale,
+ can_position, true, visible);
+}
+EXPORT_SYMBOL(drm_atomic_helper_plane_check_update);
+
+/**
* drm_atomic_helper_update_plane - Helper for primary plane update using atomic
* @plane: plane object to update
* @crtc: owning CRTC of owning plane
diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c
index 10be2d2..e346fe2 100644
--- a/drivers/gpu/drm/drm_plane_helper.c
+++ b/drivers/gpu/drm/drm_plane_helper.c
@@ -125,6 +125,12 @@ static int get_connectors_for_crtc(struct drm_crtc *crtc,
* still wish to call this function to avoid duplication of error checking
* code.
*
+ * Note: When converting over to atomic drivers you need to switch
+ * over to using drm_atomic_helper_plane_check_update() since only
+ * that correctly checks atomic state - this function here only looks
+ * at legacy state and hence will check against stale values in
+ * atomic updates.
+ *
* RETURNS:
* Zero if update appears valid, error code on failure
*/
diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
index cc1fee8..eaa2544 100644
--- a/include/drm/drm_atomic_helper.h
+++ b/include/drm/drm_atomic_helper.h
@@ -64,6 +64,11 @@ void drm_atomic_helper_swap_state(struct drm_device *dev,
struct drm_atomic_state *state);
/* implementations for legacy interfaces */
+int drm_atomic_helper_plane_check_update(struct drm_plane_state *plane_state,
+ int min_scale,
+ int max_scale,
+ bool can_position,
+ bool *visible);
int drm_atomic_helper_update_plane(struct drm_plane *plane,
struct drm_crtc *crtc,
struct drm_framebuffer *fb,
--
1.7.10.4
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