[PATCH] drm/amd/display: Fix cursor pos and hotspot calcs

[Nicholas Kazlauskas]

[Why]
The cursor calculations in amdgpu_dm incorrectly assume that the
cursor hotspot is always (0, 0) and don't respect the hot_x and hot_y
attributes that can be passed in via the drm_mode_cursor2_ioctl.

The DC hotspot parameters are also incorrectly used to offset the
cursor when it goes beyond the bounds of the screen instead of
being clamped.

[How]
Use the hot_x and hot_y attributes from the fb to directly fill in the
DC hotspot attributes.

Clamp the cursor position on the edges of the screen instead of using
the hotspot to offset it back in.

Cc: Leo Li <sunpeng.li at amd.com>
Cc: Harry Wentland <harry.wentland at amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 23 +++++++------------
 1 file changed, 8 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 01badda14079..61f2eae0b67f 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4266,7 +4266,6 @@ static int get_cursor_position(struct drm_plane *plane, struct drm_crtc *crtc,
 {
 	struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);
 	int x, y;
-	int xorigin = 0, yorigin = 0;
 
 	if (!crtc || !plane->state->fb) {
 		position->enable = false;
@@ -4284,24 +4283,18 @@ static int get_cursor_position(struct drm_plane *plane, struct drm_crtc *crtc,
 		return -EINVAL;
 	}
 
-	x = plane->state->crtc_x;
-	y = plane->state->crtc_y;
+	x = plane->state->crtc_x + plane->state->fb->hot_x;
+	y = plane->state->crtc_y + plane->state->fb->hot_y;
+
 	/* avivo cursor are offset into the total surface */
 	x += crtc->primary->state->src_x >> 16;
 	y += crtc->primary->state->src_y >> 16;
-	if (x < 0) {
-		xorigin = min(-x, amdgpu_crtc->max_cursor_width - 1);
-		x = 0;
-	}
-	if (y < 0) {
-		yorigin = min(-y, amdgpu_crtc->max_cursor_height - 1);
-		y = 0;
-	}
+
 	position->enable = true;
-	position->x = x;
-	position->y = y;
-	position->x_hotspot = xorigin;
-	position->y_hotspot = yorigin;
+	position->x = x >= 0 ? x : 0;
+	position->y = y >= 0 ? y : 0;
+	position->x_hotspot = plane->state->fb->hot_x;
+	position->y_hotspot = plane->state->fb->hot_y;
 
 	return 0;
 }
-- 
2.17.1