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authorNicholas Kazlauskas <nicholas.kazlauskas@amd.com>2020-04-05 16:40:53 -0400
committerAlex Deucher <alexander.deucher@amd.com>2020-04-07 14:20:45 -0400
commite99acf7d1a9c67a1030427a0fbc2361eda6d1496 (patch)
tree64b56f7cf601e841326e455f1e5389681465759e /drivers/gpu
parent346d8a0a3c91888a412c2735d69daa09c00f0203 (diff)
drm/amd/display: Translate cursor position by source rect
[Why] Cursor is drawn as part of the framebuffer for a plane on AMD hardware. The cursor position on the framebuffer does not change even if the source rect viewport for the cursor does. This causes the cursor to be clipped. The following IGT tests fail as a result of this issue: - kms_plane_cursor@pipe-*-viewport-size-* [How] Offset cursor position by plane source rect viewport. If the viewport is unscaled then the cursor is now correctly positioned on any plane - primary or overlay. There is still a hardware limitation for dealing with the cursor size being incorrectly scaled but that's not something we can address. Add some documentation explaining some of this in the code while we're at it. Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> Reviewed-by: Zhan Liu <Zhan.Liu@amd.com> Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c34
1 files changed, 33 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
index 0be010085575..37d4a612058a 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -3021,12 +3021,44 @@ void dcn10_set_cursor_position(struct pipe_ctx *pipe_ctx)
int x_pos = pos_cpy.x;
int y_pos = pos_cpy.y;
- // translate cursor from stream space to plane space
+ /**
+ * DC cursor is stream space, HW cursor is plane space and drawn
+ * as part of the framebuffer.
+ *
+ * Cursor position can't be negative, but hotspot can be used to
+ * shift cursor out of the plane bounds. Hotspot must be smaller
+ * than the cursor size.
+ */
+
+ /**
+ * Translate cursor from stream space to plane space.
+ *
+ * If the cursor is scaled then we need to scale the position
+ * to be in the approximately correct place. We can't do anything
+ * about the actual size being incorrect, that's a limitation of
+ * the hardware.
+ */
x_pos = (x_pos - x_plane) * pipe_ctx->plane_state->src_rect.width /
pipe_ctx->plane_state->dst_rect.width;
y_pos = (y_pos - y_plane) * pipe_ctx->plane_state->src_rect.height /
pipe_ctx->plane_state->dst_rect.height;
+ /**
+ * If the cursor's source viewport is clipped then we need to
+ * translate the cursor to appear in the correct position on
+ * the screen.
+ *
+ * This translation isn't affected by scaling so it needs to be
+ * done *after* we adjust the position for the scale factor.
+ */
+ x_pos += pipe_ctx->plane_state->src_rect.x;
+ y_pos += pipe_ctx->plane_state->src_rect.y;
+
+ /**
+ * If the position is negative then we need to add to the hotspot
+ * to shift the cursor outside the plane.
+ */
+
if (x_pos < 0) {
pos_cpy.x_hotspot -= x_pos;
x_pos = 0;