[PATCH v2] drm/msm: dpu: Allow planes to extend past active display

[Sean Paul]

From: Sean Paul <seanpaul at chromium.org>

The atomic_check is a bit too aggressive with respect to planes which
leave the active area. This caused a bunch of log spew when the cursor
got to the edge of the screen and stopped it from going all the way.

This patch removes the conservative bounds checks from atomic and clips
the dst rect such that we properly display planes which go off the
screen.

Changes in v2:
- Apply the clip to src as well (taking into account scaling)

Cc: Sravanthi Kollukuduru <skolluku at codeaurora.org>
Cc: Jeykumar Sankaran <jsanka at codeaurora.org>
Signed-off-by: Sean Paul <seanpaul at chromium.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c  |  3 +--
 drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 14 +++++++++++++-
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 07c2d15b45f2..f0a5e776ba32 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -1551,8 +1551,7 @@ static int dpu_crtc_atomic_check(struct drm_crtc *crtc,
 		cnt++;
 
 		dst = drm_plane_state_dest(pstate);
-		if (!drm_rect_intersect(&clip, &dst) ||
-		    !drm_rect_equals(&clip, &dst)) {
+		if (!drm_rect_intersect(&clip, &dst)) {
 			DPU_ERROR("invalid vertical/horizontal destination\n");
 			DPU_ERROR("display: " DRM_RECT_FMT " plane: "
 				  DRM_RECT_FMT "\n", DRM_RECT_ARG(&crtc_rect),
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
index efdf9b200dd9..adfd16625188 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
@@ -1254,7 +1254,8 @@ static int dpu_plane_sspp_atomic_update(struct drm_plane *plane,
 	const struct dpu_format *fmt;
 	struct drm_crtc *crtc;
 	struct drm_framebuffer *fb;
-	struct drm_rect src, dst;
+	struct drm_rect clip = { 0 }, src, dst;
+	int hscale, vscale;
 
 	if (!plane) {
 		DPU_ERROR("invalid plane\n");
@@ -1300,6 +1301,17 @@ static int dpu_plane_sspp_atomic_update(struct drm_plane *plane,
 
 	dst = drm_plane_state_dest(state);
 
+	hscale = drm_rect_calc_hscale(&src, &dst,
+				      pdpu->pipe_sblk->maxupscale,
+				      pdpu->pipe_sblk->maxdwnscale);
+	vscale = drm_rect_calc_vscale(&src, &dst,
+				      pdpu->pipe_sblk->maxupscale,
+				      pdpu->pipe_sblk->maxdwnscale);
+
+	clip.x2 = crtc->state->adjusted_mode.hdisplay;
+	clip.y2 = crtc->state->adjusted_mode.vdisplay;
+	drm_rect_clip_scaled(&src, &dst, &clip, hscale, vscale);
+
 	DPU_DEBUG_PLANE(pdpu, "FB[%u] " DRM_RECT_FMT "->crtc%u " DRM_RECT_FMT
 			", %4.4s ubwc %d\n", fb->base.id, DRM_RECT_ARG(&src),
 			crtc->base.id, DRM_RECT_ARG(&dst),
-- 
Sean Paul, Software Engineer, Google / Chromium OS