drm/amd/display: Implement interface for notify cursor support change

[Description]
Add new interface for notifying OS of cursor support changes
Reviewed-by: Aric Cyr <aric.cyr@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alvin Lee <alvin.lee2@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -5337,3 +5337,17 @@ bool dc_abm_save_restore(
 	return false;
 }
 
+void dc_query_current_properties(struct dc *dc, struct dc_current_properties *properties)
+{
+	unsigned int i;
+	bool subvp_in_use = false;
+
+	for (i = 0; i < dc->current_state->stream_count; i++) {
+		if (dc->current_state->streams[i]->mall_stream_config.type != SUBVP_NONE) {
+			subvp_in_use = true;
+			break;
+		}
+	}
+	properties->cursor_size_limit = subvp_in_use ? 64 : dc->caps.max_cursor_size;
+}
+

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

@@ -910,6 +910,14 @@ struct dc_debug_options {
 };
 
 struct gpu_info_soc_bounding_box_v1_0;
+
+/* Generic structure that can be used to query properties of DC. More fields
+ * can be added as required.
+ */
+struct dc_current_properties {
+	unsigned int cursor_size_limit;
+};
+
 struct dc {
 	struct dc_debug_options debug;
 	struct dc_versions versions;
@@ -2280,6 +2288,8 @@ void dc_process_dmub_dpia_hpd_int_enable(const struct dc *dc,
 
 void dc_print_dmub_diagnostic_data(const struct dc *dc);
 
+void dc_query_current_properties(struct dc *dc, struct dc_current_properties *properties);
+
 /* DSC Interfaces */
 #include "dc_dsc.h"