[PATCH 06/17] drm/amd/display: fix cursor calculation for 1xnY rotated display groups

[Bindu Ramamurthy]

From: Samson Tam <Samson.Tam at amd.com>

[Why]
Cursor is missing on displays 2 and up when doing rotated
 display groups in 1xnY setup.  Calculation puts cursor
 out of bounds so it is not enabled.

[How]
In dcn10_set_cursor_position(), add in viewport.y into cursor
 calculations for 1xnY rotated display groups.
For pipe split, check viewport.y for both pipes and use lower one
 to normalize cursor position before calculations.
Add odm 2:1 support ( using same calculations as pipe split ).

Signed-off-by: Samson Tam <Samson.Tam at amd.com>
Acked-by: Bindu Ramamurthy <bindu.r at amd.com>
---
 .../amd/display/dc/dcn10/dcn10_hw_sequencer.c | 64 +++++++++++++++++--
 1 file changed, 58 insertions(+), 6 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 8eb88a50af51..1e18f0bb40b6 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
@@ -3279,6 +3279,8 @@ void dcn10_set_cursor_position(struct pipe_ctx *pipe_ctx)
 	};
 	bool pipe_split_on = (pipe_ctx->top_pipe != NULL) ||
 		(pipe_ctx->bottom_pipe != NULL);
+	bool odm_combine_on = (pipe_ctx->next_odm_pipe != NULL) ||
+		(pipe_ctx->prev_odm_pipe != NULL);
 
 	int x_plane = pipe_ctx->plane_state->dst_rect.x;
 	int y_plane = pipe_ctx->plane_state->dst_rect.y;
@@ -3362,16 +3364,56 @@ void dcn10_set_cursor_position(struct pipe_ctx *pipe_ctx)
 		uint32_t temp_y = pos_cpy.y;
 		int viewport_height =
 			pipe_ctx->plane_res.scl_data.viewport.height;
-
-		if (pipe_split_on) {
+		int viewport_y =
+			pipe_ctx->plane_res.scl_data.viewport.y;
+
+		/**
+		 * Display groups that are 1xnY, have pos_cpy.x > 2 * viewport.height
+		 * For pipe split cases:
+		 * - apply offset of viewport.y to normalize pos_cpy.x
+		 * - calculate the pos_cpy.y as before
+		 * - shift pos_cpy.y back by same offset to get final value
+		 * - since we iterate through both pipes, use the lower
+		 *   viewport.y for offset
+		 * For non pipe split cases, use the same calculation for
+		 *  pos_cpy.y as the 180 degree rotation case below,
+		 *  but use pos_cpy.x as our input because we are rotating
+		 *  270 degrees
+		 */
+		if (pipe_split_on || odm_combine_on) {
+			int pos_cpy_x_offset;
+			int other_pipe_viewport_y;
+
+			if (pipe_split_on) {
+				if (pipe_ctx->bottom_pipe) {
+					other_pipe_viewport_y =
+						pipe_ctx->bottom_pipe->plane_res.scl_data.viewport.y;
+				} else {
+					other_pipe_viewport_y =
+						pipe_ctx->top_pipe->plane_res.scl_data.viewport.y;
+				}
+			} else {
+				if (pipe_ctx->next_odm_pipe) {
+					other_pipe_viewport_y =
+						pipe_ctx->next_odm_pipe->plane_res.scl_data.viewport.y;
+				} else {
+					other_pipe_viewport_y =
+						pipe_ctx->prev_odm_pipe->plane_res.scl_data.viewport.y;
+				}
+			}
+			pos_cpy_x_offset = (viewport_y > other_pipe_viewport_y) ?
+				other_pipe_viewport_y : viewport_y;
+			pos_cpy.x -= pos_cpy_x_offset;
 			if (pos_cpy.x > viewport_height) {
 				pos_cpy.x = pos_cpy.x - viewport_height;
 				pos_cpy.y = viewport_height - pos_cpy.x;
 			} else {
 				pos_cpy.y = 2 * viewport_height - pos_cpy.x;
 			}
-		} else
-			pos_cpy.y = viewport_height - pos_cpy.x;
+			pos_cpy.y += pos_cpy_x_offset;
+		} else {
+			pos_cpy.y = (2 * viewport_y) + viewport_height - pos_cpy.x;
+		}
 		pos_cpy.x = temp_y;
 	}
 	// Mirror horizontally and vertically
@@ -3381,7 +3423,7 @@ void dcn10_set_cursor_position(struct pipe_ctx *pipe_ctx)
 		int viewport_x =
 			pipe_ctx->plane_res.scl_data.viewport.x;
 
-		if (pipe_split_on) {
+		if (pipe_split_on || odm_combine_on) {
 			if (pos_cpy.x >= viewport_width + viewport_x) {
 				pos_cpy.x = 2 * viewport_width
 						- pos_cpy.x + 2 * viewport_x;
@@ -3399,7 +3441,17 @@ void dcn10_set_cursor_position(struct pipe_ctx *pipe_ctx)
 		} else {
 			pos_cpy.x = viewport_width - pos_cpy.x + 2 * viewport_x;
 		}
-		pos_cpy.y = pipe_ctx->plane_res.scl_data.viewport.height - pos_cpy.y;
+
+		/**
+		 * Display groups that are 1xnY, have pos_cpy.y > viewport.height
+		 * Calculation:
+		 *   delta_from_bottom = viewport.y + viewport.height - pos_cpy.y
+		 *   pos_cpy.y_new = viewport.y + delta_from_bottom
+		 * Simplify it as:
+		 *   pos_cpy.y = viewport.y * 2 + viewport.height - pos_cpy.y
+		 */
+		pos_cpy.y = (2 * pipe_ctx->plane_res.scl_data.viewport.y) +
+			pipe_ctx->plane_res.scl_data.viewport.height - pos_cpy.y;
 	}
 
 	hubp->funcs->set_cursor_position(hubp, &pos_cpy, &param);
-- 
2.25.1