[PATCH 27/35] drm/amd/display: PIP overlay corruption

[Bhawanpreet Lakha]

From: Murton Liu <murton.liu at amd.com>

[Why]
When moving mouse onto or off of pip plane,
screen would flash briefly due to garbage negative
pos values being programmed for cursor.
Also, text flashes due to PIP flips taking too long.

[How]
When negative pos value seen, default to 0 and adjust by modifying cursor hotspot.
For flip issue, only do post update when optimize required vs all the time.

Change-Id: I38990fe0a916306a781ae06147d5d6bd89f3fe92
Signed-off-by: Murton Liu <murton.liu at amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr at amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha at amd.com>
Acked-by: Sivapiriyan Kumarasamy <Sivapiriyan.Kumarasamy at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c      |  3 +++
 .../gpu/drm/amd/display/dc/dcn10/dcn10_hubp.c | 23 +++++++++++++++++--
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index af5f486d24e0..77e1bd18b1dd 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1125,6 +1125,9 @@ bool dc_post_update_surfaces_to_stream(struct dc *dc)
 	int i;
 	struct dc_state *context = dc->current_state;
 
+	if (dc->optimized_required == false)
+		return true;
+
 	post_surface_trace(dc);
 
 	for (i = 0; i < dc->res_pool->pipe_count; i++)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubp.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubp.c
index 0ba68d41b9c3..683829466a44 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubp.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubp.c
@@ -1150,9 +1150,28 @@ void hubp1_cursor_set_position(
 	REG_UPDATE(CURSOR_CONTROL,
 			CURSOR_ENABLE, cur_en);
 
-	REG_SET_2(CURSOR_POSITION, 0,
-			CURSOR_X_POSITION, pos->x,
+	//account for cases where we see negative offset relative to overlay plane
+	if (src_x_offset < 0 && src_y_offset < 0) {
+		REG_SET_2(CURSOR_POSITION, 0,
+			CURSOR_X_POSITION, 0,
+			CURSOR_Y_POSITION, 0);
+		x_hotspot -= src_x_offset;
+		y_hotspot -= src_y_offset;
+	} else if (src_x_offset < 0) {
+		REG_SET_2(CURSOR_POSITION, 0,
+			CURSOR_X_POSITION, 0,
 			CURSOR_Y_POSITION, pos->y);
+		x_hotspot -= src_x_offset;
+	} else if (src_y_offset < 0) {
+		REG_SET_2(CURSOR_POSITION, 0,
+			CURSOR_X_POSITION, pos->x,
+			CURSOR_Y_POSITION, 0);
+		y_hotspot -= src_y_offset;
+	} else {
+		REG_SET_2(CURSOR_POSITION, 0,
+				CURSOR_X_POSITION, pos->x,
+				CURSOR_Y_POSITION, pos->y);
+	}
 
 	REG_SET_2(CURSOR_HOT_SPOT, 0,
 			CURSOR_HOT_SPOT_X, x_hotspot,
-- 
2.17.1