drm/amd/display: Make cursor source translation adjustment optional

[Why]
In some usecases, like tiled display, the stream and plane configuration
can be setup in a way where the caller expects DAL to perform the
clipping, eg:

P0:
src_rect(0, 0, w, h)
dst_rect(0, 0, w, h)

P1:
src_rect(w, 0, w, h)
dst_rect(0, 0, w, h)

Cursor is enabled on both streams with the same position.

This can result in double cursor on tiled display, even though this
behavior is technically correct from the DC interface point of view.

We need a mechanism to control this dynamically.

[How]
This is something that should live in the DM layer based on detection
of the specified configuration but it's not something that we really
have enough information to deal with today.

Add a flag to the cursor position state that specifies whether we
want DC to do the translation or not and make it opt-in and let
the DM decide when to do it.

Signed-off-by: Nicholas Kazlauskas <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Acked-by: Rodrigo Siqueira <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: Nicholas Kazlauskas

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -6283,6 +6283,7 @@ static int get_cursor_position(struct drm_plane *plane, struct drm_crtc *crtc,
 		y = 0;
 	}
 	position->enable = true;
+	position->translate_by_source = true;
 	position->x = x;
 	position->y = y;
 	position->x_hotspot = xorigin;

drivers/gpu/drm/amd/display/dc/dc_hw_types.h

@@ -385,6 +385,8 @@ struct dc_cursor_position {
 	 */
 	bool enable;
 
+	/* Translate cursor x/y by the source rectangle for each plane. */
+	bool translate_by_source;
 };
 
 struct dc_cursor_mi_param {

drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c

@@ -2692,9 +2692,15 @@ void dce110_set_cursor_position(struct pipe_ctx *pipe_ctx)
 	 *
 	 * This translation isn't affected by scaling so it needs to be
 	 * done *after* we adjust the position for the scale factor.
+	 *
+	 * This is only done by opt-in for now since there are still
+	 * some usecases like tiled display that might enable the
+	 * cursor on both streams while expecting dc to clip it.
 	 */
-	pos_cpy.x += pipe_ctx->plane_state->src_rect.x;
-	pos_cpy.y += pipe_ctx->plane_state->src_rect.y;
+	if (pos_cpy.translate_by_source) {
+		pos_cpy.x += pipe_ctx->plane_state->src_rect.x;
+		pos_cpy.y += pipe_ctx->plane_state->src_rect.y;
+	}
 
 	if (pipe_ctx->plane_state->address.type
 			== PLN_ADDR_TYPE_VIDEO_PROGRESSIVE)

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

@@ -3050,9 +3050,15 @@ void dcn10_set_cursor_position(struct pipe_ctx *pipe_ctx)
 	 *
 	 * This translation isn't affected by scaling so it needs to be
 	 * done *after* we adjust the position for the scale factor.
+	 *
+	 * This is only done by opt-in for now since there are still
+	 * some usecases like tiled display that might enable the
+	 * cursor on both streams while expecting dc to clip it.
 	 */
-	x_pos += pipe_ctx->plane_state->src_rect.x;
-	y_pos += pipe_ctx->plane_state->src_rect.y;
+	if (pos_cpy.translate_by_source) {
+		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