drm/amd/display: use full update for clip size increase of large plan…

…e source

[ Upstream commit 05b7827 ]

[why]
Clip size increase will increase viewport, which could cause us to
switch  to MPC combine.
If we skip full update, we are not able to change to MPC combine in
fast update. This will cause corruption showing on the video plane.

[how]
treat clip size increase of a surface larger than 5k as a full update.

Reviewed-by: Jun Lei <jun.lei@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -996,7 +996,8 @@ static bool dc_construct(struct dc *dc,
 	/* set i2c speed if not done by the respective dcnxxx__resource.c */
 	if (dc->caps.i2c_speed_in_khz_hdcp == 0)
 		dc->caps.i2c_speed_in_khz_hdcp = dc->caps.i2c_speed_in_khz;
-
+	if (dc->caps.max_optimizable_video_width == 0)
+		dc->caps.max_optimizable_video_width = 5120;
 	dc->clk_mgr = dc_clk_mgr_create(dc->ctx, dc->res_pool->pp_smu, dc->res_pool->dccg);
 	if (!dc->clk_mgr)
 		goto fail;
@@ -2438,6 +2439,7 @@ static enum surface_update_type get_plane_info_update_type(const struct dc_surfa
 }
 
 static enum surface_update_type get_scaling_info_update_type(
+		const struct dc *dc,
 		const struct dc_surface_update *u)
 {
 	union surface_update_flags *update_flags = &u->surface->update_flags;
@@ -2472,6 +2474,12 @@ static enum surface_update_type get_scaling_info_update_type(
 			update_flags->bits.clock_change = 1;
 	}
 
+	if (u->scaling_info->src_rect.width > dc->caps.max_optimizable_video_width &&
+		(u->scaling_info->clip_rect.width > u->surface->clip_rect.width ||
+		 u->scaling_info->clip_rect.height > u->surface->clip_rect.height))
+		 /* Changing clip size of a large surface may result in MPC slice count change */
+		update_flags->bits.bandwidth_change = 1;
+
 	if (u->scaling_info->src_rect.x != u->surface->src_rect.x
 			|| u->scaling_info->src_rect.y != u->surface->src_rect.y
 			|| u->scaling_info->clip_rect.x != u->surface->clip_rect.x
@@ -2509,7 +2517,7 @@ static enum surface_update_type det_surface_update(const struct dc *dc,
 	type = get_plane_info_update_type(u);
 	elevate_update_type(&overall_type, type);
 
-	type = get_scaling_info_update_type(u);
+	type = get_scaling_info_update_type(dc, u);
 	elevate_update_type(&overall_type, type);
 
 	if (u->flip_addr) {

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

@@ -230,6 +230,11 @@ struct dc_caps {
 	uint32_t dmdata_alloc_size;
 	unsigned int max_cursor_size;
 	unsigned int max_video_width;
+	/*
+	 * max video plane width that can be safely assumed to be always
+	 * supported by single DPP pipe.
+	 */
+	unsigned int max_optimizable_video_width;
 	unsigned int min_horizontal_blanking_period;
 	int linear_pitch_alignment;
 	bool dcc_const_color;