Pull the parameter checking from drm_primary_helper_update() out into
its own function; drivers that provide their own setplane()
implementations rather than using the helper may still want to share
this parameter checking logic.
A few of the checks here were also updated based on suggestions by
Ville Syrjälä.
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
---
drivers/gpu/drm/drm_plane_helper.c | 148 +++++++++++++++++++++++++++++--------
include/drm/drm_plane_helper.h | 9 +++
2 files changed, 128 insertions(+), 29 deletions(-)
diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c
index 65c4a00..9bbbdf2 100644
--- a/drivers/gpu/drm/drm_plane_helper.c
+++ b/drivers/gpu/drm/drm_plane_helper.c
@@ -66,6 +66,102 @@ static int get_connectors_for_crtc(struct drm_crtc *crtc,
}
/**
+ * drm_primary_helper_check_update() - Check primary plane update for validity
+ * @plane: plane object to update
+ * @crtc: owning CRTC of owning plane
+ * @fb: framebuffer to flip onto plane
+ * @crtc_x: x offset of primary plane on crtc
+ * @crtc_y: y offset of primary plane on crtc
+ * @crtc_w: width of primary plane rectangle on crtc
+ * @crtc_h: height of primary plane rectangle on crtc
+ * @src_x: x offset of @fb for panning
+ * @src_y: y offset of @fb for panning
+ * @src_w: width of source rectangle in @fb
+ * @src_h: height of source rectangle in @fb
+ * @can_scale: is primary plane scaling legal?
+ * @can_position: is it legal to position the primary plane such that it
+ * doesn't cover the entire crtc?
+ *
+ * Checks that a desired primary plane update is valid. Drivers that provide
+ * their own primary plane handling may still wish to call this function to
+ * avoid duplication of error checking code.
+ *
+ * RETURNS:
+ * Zero if update appears valid, error code on failure
+ */
+int drm_primary_helper_check_update(struct drm_plane *plane,
+ struct drm_crtc *crtc,
+ struct drm_framebuffer *fb,
+ int crtc_x, int crtc_y,
+ unsigned int crtc_w, unsigned int crtc_h,
+ uint32_t src_x, uint32_t src_y,
+ uint32_t src_w, uint32_t src_h,
+ bool can_scale,
+ bool can_position)
+{
+ struct drm_rect dest = {
+ .x1 = crtc_x,
+ .y1 = crtc_y,
+ .x2 = crtc_x + crtc_w,
+ .y2 = crtc_y + crtc_h,
+ };
+ struct drm_rect src = {
+ .x1 = src_x >> 16,
+ .y1 = src_y >> 16,
+ .x2 = (src_x + src_w) >> 16,
+ .y2 = (src_y + src_h) >> 16,
+ };
+ const struct drm_rect clip = {
+ .x2 = crtc->mode.hdisplay,
+ .y2 = crtc->mode.vdisplay,
+ };
+ int hscale, vscale;
+ int visible;
+
+ if (!crtc->enabled) {
+ DRM_DEBUG_KMS("Cannot update primary plane of a disabled CRTC.\n");
+ return -EINVAL;
+ }
+
+ /* setplane API takes shifted source rectangle values; unshift them */
+ src_x >>= 16;
+ src_y >>= 16;
+ src_w >>= 16;
+ src_h >>= 16;
+
+ /* check scaling */
+ if (!can_scale && (crtc_w != src_w || crtc_h != src_h)) {
+ DRM_DEBUG_KMS("Can't scale primary plane\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Drivers that can scale should perform their own min/max scale
+ * factor checks.
+ */
+ hscale = drm_rect_calc_hscale(&src, &dest, 0, INT_MAX);
+ vscale = drm_rect_calc_vscale(&src, &dest, 0, INT_MAX);
+ visible = drm_rect_clip_scaled(&src, &dest, &clip, hscale, vscale);
+ if (!visible)
+ /*
+ * Primary plane isn't visible; some drivers can handle this
+ * so we just return success here. Drivers that can't
+ * (including those that use the primary plane helper's
+ * update function) will return an error from their
+ * update_plane handler.
+ */
+ return 0;
+
+ if (!can_position && !drm_rect_equals(&dest, &clip)) {
+ DRM_DEBUG_KMS("Primary plane must cover entire CRTC\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_primary_helper_check_update);
+
+/**
* drm_primary_helper_update() - Helper for primary plane update
* @plane: plane object to update
* @crtc: owning CRTC of owning plane
@@ -113,6 +209,12 @@ int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
.x = src_x >> 16,
.y = src_y >> 16,
};
+ struct drm_rect src = {
+ .x1 = src_x >> 16,
+ .y1 = src_y >> 16,
+ .x2 = (src_x + src_w) >> 16,
+ .y2 = (src_y + src_h) >> 16,
+ };
struct drm_rect dest = {
.x1 = crtc_x,
.y1 = crtc_y,
@@ -124,40 +226,28 @@ int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
.y2 = crtc->mode.vdisplay,
};
struct drm_connector **connector_list;
+ int visible;
+ int hscale, vscale;
int num_connectors, ret;
- if (!crtc->enabled) {
- DRM_DEBUG_KMS("Cannot update primary plane of a disabled CRTC.\n");
- return -EINVAL;
- }
-
- /* Disallow subpixel positioning */
- if ((src_x | src_y | src_w | src_h) & SUBPIXEL_MASK) {
- DRM_DEBUG_KMS("Primary plane does not support subpixel positioning\n");
- return -EINVAL;
- }
-
- /* Disallow scaling */
- src_w >>= 16;
- src_h >>= 16;
- if (crtc_w != src_w || crtc_h != src_h) {
- DRM_DEBUG_KMS("Can't scale primary plane\n");
- return -EINVAL;
- }
-
- /* Make sure primary plane covers entire CRTC */
- drm_rect_intersect(&dest, &clip);
- if (dest.x1 != 0 || dest.y1 != 0 ||
- dest.x2 != crtc->mode.hdisplay || dest.y2 != crtc->mode.vdisplay) {
- DRM_DEBUG_KMS("Primary plane must cover entire CRTC\n");
- return -EINVAL;
- }
-
- /* Framebuffer must be big enough to cover entire plane */
- ret = drm_crtc_check_viewport(crtc, crtc_x, crtc_y, &crtc->mode, fb);
+ ret = drm_primary_helper_check_update(plane, crtc, fb,
+ crtc_x, crtc_y, crtc_w, crtc_h,
+ src_x, src_y, src_w, src_h,
+ false, false);
if (ret)
return ret;
+ hscale = drm_rect_calc_hscale(&src, &dest, 0, INT_MAX);
+ vscale = drm_rect_calc_vscale(&src, &dest, 0, INT_MAX);
+ visible = drm_rect_clip_scaled(&src, &dest, &clip, hscale, vscale);
+ if (!visible)
+ /*
+ * Primary plane isn't visible. Note that unless a driver
+ * provides their own disable function, this will just
+ * wind up returning -EINVAL to userspace.
+ */
+ return plane->funcs->disable_plane(plane);
+
/* Find current connectors for CRTC */
num_connectors = get_connectors_for_crtc(crtc, NULL, 0);
BUG_ON(num_connectors == 0);
diff --git a/include/drm/drm_plane_helper.h b/include/drm/drm_plane_helper.h
index 09824be..373201a 100644
--- a/include/drm/drm_plane_helper.h
+++ b/include/drm/drm_plane_helper.h
@@ -31,6 +31,15 @@
* planes.
*/
+extern int drm_primary_helper_check_update(struct drm_plane *plane,
+ struct drm_crtc *crtc,
+ struct drm_framebuffer *fb,
+ int crtc_x, int crtc_y,
+ unsigned int crtc_w, unsigned int crtc_h,
+ uint32_t src_x, uint32_t src_y,
+ uint32_t src_w, uint32_t src_h,
+ bool can_scale,
+ bool can_position);
extern int drm_primary_helper_update(struct drm_plane *plane,
struct drm_crtc *crtc,
struct drm_framebuffer *fb,
--
1.8.5.1
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