[PATCH] drm/amd/display: Use full update for swizzle mode change

[Charlene Liu <Charlene.Liu@xxxxxxx>]

[WHY & HOW]
1) We did linear/non linear transition properly long ago
2) We used that path to handle SystemDisplayEnable
3) We fixed a SystemDisplayEnable inability to fallback to passive by
   impacting the transition flow generically
4) AFMF later relied on the generic transition behavior

Separating the two flows to make (3) non-generic is the best immediate
coarse of action.

DC can discern SSAMPO3 very easily from SDE.

Cc: Mario Limonciello <mario.limonciello@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Chris Park <chris.park@xxxxxxx>
Signed-off-by: Charlene Liu <Charlene.Liu@xxxxxxx>
Signed-off-by: Alex Hung <alex.hung@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 67812fbbb006..a1652130e4be 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -2376,7 +2376,7 @@ static bool is_surface_in_context(
 	return false;
 }
 
-static enum surface_update_type get_plane_info_update_type(const struct dc_surface_update *u)
+static enum surface_update_type get_plane_info_update_type(const struct dc *dc, const struct dc_surface_update *u)
 {
 	union surface_update_flags *update_flags = &u->surface->update_flags;
 	enum surface_update_type update_type = UPDATE_TYPE_FAST;
@@ -2455,7 +2455,7 @@ static enum surface_update_type get_plane_info_update_type(const struct dc_surfa
 		/* todo: below are HW dependent, we should add a hook to
 		 * DCE/N resource and validated there.
 		 */
-		if (u->plane_info->tiling_info.gfx9.swizzle != DC_SW_LINEAR) {
+		if (!dc->debug.skip_full_updated_if_possible) {
 			/* swizzled mode requires RQ to be setup properly,
 			 * thus need to run DML to calculate RQ settings
 			 */
@@ -2547,7 +2547,7 @@ static enum surface_update_type det_surface_update(const struct dc *dc,
 
 	update_flags->raw = 0; // Reset all flags
 
-	type = get_plane_info_update_type(u);
+	type = get_plane_info_update_type(dc, u);
 	elevate_update_type(&overall_type, type);
 
 	type = get_scaling_info_update_type(dc, u);
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index e659f4fed19f..78ebe636389e 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -1060,6 +1060,7 @@ struct dc_debug_options {
 	bool enable_ips_visual_confirm;
 	unsigned int sharpen_policy;
 	unsigned int scale_to_sharpness_policy;
+	bool skip_full_updated_if_possible;
 };