drm/amd/display: Add new DP tunnel bandwidth validation

[Why & How]
Add new function for DP tunnel bandwidth validation.
It uses the estimated BW and allocated BW to validate the timings.

Reviewed-by: PeiChen Huang <peichen.huang@amd.com>
Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Signed-off-by: Cruise Hung <Cruise.Hung@amd.com>
Signed-off-by: Fangzhi Zuo <jerry.zuo@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 84 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/link/link_validation.c b/drivers/gpu/drm/amd/display/dc/link/link_validation.c
index e2235fd32998..5b88a1c48dac 100644
--- a/drivers/gpu/drm/amd/display/dc/link/link_validation.c
+++ b/drivers/gpu/drm/amd/display/dc/link/link_validation.c
@@ -263,6 +263,14 @@ uint32_t dp_link_bandwidth_kbps(
 	return link_rate_per_lane_kbps * link_settings->lane_count / 10000 * total_data_bw_efficiency_x10000;
 }
 
+static uint32_t dp_get_timing_bandwidth_kbps(
+	const struct dc_crtc_timing *timing,
+	const struct dc_link *link)
+{
+	return dc_bandwidth_in_kbps_from_timing(timing,
+			dc_link_get_highest_encoding_format(link));
+}
+
 static bool dp_validate_mode_timing(
 	struct dc_link *link,
 	const struct dc_crtc_timing *timing)
@@ -411,13 +419,88 @@ bool link_validate_dpia_bandwidth(const struct dc_stream_state *stream, const un
 	for (uint8_t i = 0; i < num_dpias; ++i) {
 		int dp_overhead = 0;
 
-		dp_overhead = link_dp_dpia_get_dp_overhead_in_dp_tunneling(dpia_link[i]);
+		dp_overhead = link_dpia_get_dp_mst_overhead(dpia_link[i]);
 		bw_needed[i] += dp_overhead;
 	}
 
 	return dpia_validate_usb4_bw(dpia_link, bw_needed, num_dpias);
 }
 
+static const struct dc_tunnel_settings *get_dp_tunnel_settings(const struct dc_state *context,
+		const struct dc_stream_state *stream)
+{
+	int i;
+	const struct dc_tunnel_settings *dp_tunnel_settings = NULL;
+
+	for (i = 0; i < MAX_PIPES; i++) {
+		if (context->res_ctx.pipe_ctx[i].stream && (context->res_ctx.pipe_ctx[i].stream == stream)) {
+			dp_tunnel_settings = &context->res_ctx.pipe_ctx[i].link_config.dp_tunnel_settings;
+			break;
+		}
+	}
+
+	return dp_tunnel_settings;
+}
+
+/*
+ * Calculates the DP tunneling bandwidth required for the stream timing
+ * and aggregates the stream bandwidth for the respective DP tunneling link
+ *
+ * return: dc_status
+ */
+enum dc_status link_validate_dp_tunnel_bandwidth(const struct dc *dc, const struct dc_state *new_ctx)
+{
+	struct dc_validation_dpia_set dpia_link_sets[MAX_DPIA_NUM] = { 0 };
+	uint8_t link_count = 0;
+	enum dc_status result = DC_OK;
+
+	for (uint8_t i = 0; (i < MAX_PIPES && i < new_ctx->stream_count); i++) {
+		const struct dc_stream_state *stream = new_ctx->streams[i];
+		const struct dc_link *link;
+		const struct dc_tunnel_settings *dp_tunnel_settings;
+		uint32_t timing_bw;
+
+		if (stream == NULL)
+			continue;
+
+		link = stream->link;
+
+		if (!(link && (stream->signal == SIGNAL_TYPE_DISPLAY_PORT
+				|| stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST)
+				&& link->hpd_status))
+			continue;
+
+		dp_tunnel_settings = get_dp_tunnel_settings(new_ctx, stream);
+
+		if ((dp_tunnel_settings == NULL) || (dp_tunnel_settings->should_use_dp_bw_allocation == false))
+			continue;
+
+		timing_bw = dp_get_timing_bandwidth_kbps(&stream->timing, link);
+
+		for (uint8_t j = 0; j < MAX_DPIA_NUM; j++) {
+			bool is_new_slot = false;
+
+			if (dpia_link_sets[j].link == NULL) {
+				is_new_slot = true;
+				link_count++;
+				dpia_link_sets[j].required_bw = 0;
+				dpia_link_sets[j].link = link;
+			}
+
+			if (is_new_slot || (dpia_link_sets[j].link == link)) {
+				dpia_link_sets[j].tunnel_settings = dp_tunnel_settings;
+				dpia_link_sets[j].required_bw += timing_bw;
+				break;
+			}
+		}
+	}
+
+	if (link_count && link_dpia_validate_dp_tunnel_bandwidth(dpia_link_sets, link_count) == false)
+		result = DC_FAIL_DP_TUNNEL_BW_VALIDATE;
+
+	return result;
+}
+
 struct dp_audio_layout_config {
 	uint8_t layouts_per_sample_denom;
 	uint8_t symbols_per_layout;