linux-kernel - [PATCH] drm/amd/display: dual cursors are seen if scaling is enabled

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Date:   Mon, 29 Mar 2021 15:54:10 +0800
From:   Louis Li <Ching-shih.Li@....com>
To:     unlisted-recipients:; (no To-header on input)
CC:     <ching-li@....com>, Louis Li <Ching-shih.Li@....com>,
        Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "Nicholas Kazlauskas" <Nicholas.Kazlauskas@....com>,
        Ikshwaku Chauhan <ikshwaku.chauhan@....corp-partner.google.com>,
        Aric Cyr <aric.cyr@....com>, hersen wu <hersenxs.wu@....com>,
        Stéphane Marchesin <marcheu@...omium.org>,
        <amd-gfx@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] drm/amd/display: dual cursors are seen if scaling is enabled

[Why]
This issue is found when scaling is not equal to one from src to dest.
When issue happens, there are offsets in both axis x and y between
two cursors. Users cannot control APP under such a condition.

[How]
For dual cursors, cursor should be disabled if there is a visible pipe
on top of the current pipe at the current cursor position.
For offsets between two cursors, need translate cursor position from
stream space to plane space with scaling into consideration.

Tested-by: Louis Li <Ching-shih.Li@....com>
Signed-off-by: Louis Li <Ching-shih.Li@....com>
Change-Id: Ic19e4f3b9225736f037f5ade10b68e8afe5f9ab7
---
 .../amd/display/dc/dcn10/dcn10_hw_sequencer.c | 40 ++++++++++++++-----
 1 file changed, 30 insertions(+), 10 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 83212ea40077..1ce5e58e3a9e 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
@@ -2999,6 +2999,10 @@ static bool dcn10_can_pipe_disable_cursor(struct pipe_ctx *pipe_ctx)
 	const struct rect *r1 = &pipe_ctx->plane_res.scl_data.recout, *r2;
 	int r1_r = r1->x + r1->width, r1_b = r1->y + r1->height, r2_r, r2_b;
 
+	struct dc_cursor_position pos_cpy = pipe_ctx->stream->cursor_position;
+	int cp_x = pos_cpy.x;
+	int cp_y = pos_cpy.y;
+
 	/**
 	 * Disable the cursor if there's another pipe above this with a
 	 * plane that contains this pipe's viewport to prevent double cursor
@@ -3013,7 +3017,8 @@ static bool dcn10_can_pipe_disable_cursor(struct pipe_ctx *pipe_ctx)
 		r2_r = r2->x + r2->width;
 		r2_b = r2->y + r2->height;
 
-		if (r1->x >= r2->x && r1->y >= r2->y && r1_r <= r2_r && r1_b <= r2_b)
+		if ((cp_x >= r1->x && cp_y >= r1->y && cp_x <= r1_r && cp_y <= r1_b)
+		   && (cp_x >= r2->x && cp_y >= r2->y && cp_x <= r2_r && cp_y <= r2_b))
 			return true;
 	}
 
@@ -3034,15 +3039,30 @@ static void dcn10_set_cursor_position(struct pipe_ctx *pipe_ctx)
 		.rotation = pipe_ctx->plane_state->rotation,
 		.mirror = pipe_ctx->plane_state->horizontal_mirror
 	};
-	uint32_t x_plane = pipe_ctx->plane_state->dst_rect.x;
-	uint32_t y_plane = pipe_ctx->plane_state->dst_rect.y;
-	uint32_t x_offset = min(x_plane, pos_cpy.x);
-	uint32_t y_offset = min(y_plane, pos_cpy.y);
-
-	pos_cpy.x -= x_offset;
-	pos_cpy.y -= y_offset;
-	pos_cpy.x_hotspot += (x_plane - x_offset);
-	pos_cpy.y_hotspot += (y_plane - y_offset);
+
+	int x_plane = pipe_ctx->plane_state->dst_rect.x;
+	int y_plane = pipe_ctx->plane_state->dst_rect.y;
+	int x_pos = pos_cpy.x;
+	int y_pos = pos_cpy.y;
+
+	// translate cursor from stream space to plane space
+	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 (x_pos < 0) {
+		pos_cpy.x_hotspot -= x_pos;
+		x_pos = 0;
+	}
+
+	if (y_pos < 0) {
+		pos_cpy.y_hotspot -= y_pos;
+		y_pos = 0;
+	}
+
+	pos_cpy.x = (uint32_t)x_pos;
+	pos_cpy.y = (uint32_t)y_pos;
 
 	if (pipe_ctx->plane_state->address.type
 			== PLN_ADDR_TYPE_VIDEO_PROGRESSIVE)
-- 
2.27.0