[PATCH 3/3] drm/amd/display: update bw_calcs to take pipe sync into account (v2)

[Alex Deucher]

Properly set all_displays_in_sync so that when the data is
propagated to powerplay, it's set properly and we can enable
mclk switching when all monitors are in sync.

v2: fix logic, clean up

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 .../gpu/drm/amd/display/dc/calcs/dce_calcs.c  | 49 ++++++++++++++++++-
 1 file changed, 47 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/calcs/dce_calcs.c b/drivers/gpu/drm/amd/display/dc/calcs/dce_calcs.c
index 9f12e21f8b9b..8d904647fb0f 100644
--- a/drivers/gpu/drm/amd/display/dc/calcs/dce_calcs.c
+++ b/drivers/gpu/drm/amd/display/dc/calcs/dce_calcs.c
@@ -25,6 +25,7 @@
 
 #include <linux/slab.h>
 
+#include "resource.h"
 #include "dm_services.h"
 #include "dce_calcs.h"
 #include "dc.h"
@@ -2977,6 +2978,50 @@ static void populate_initial_data(
 	data->number_of_displays = num_displays;
 }
 
+static bool all_displays_in_sync(const struct pipe_ctx pipe[],
+				 int pipe_count,
+				 uint32_t number_of_displays)
+{
+	const struct pipe_ctx *unsynced_pipes[MAX_PIPES] = { NULL };
+	int group_size = 1;
+	int i, j;
+
+	for (i = 0; i < pipe_count; i++) {
+		if (!pipe[i].stream)
+			continue;
+
+		unsynced_pipes[i] = &pipe[i];
+	}
+
+	for (i = 0; i < pipe_count; i++) {
+		const struct pipe_ctx *pipe_set[MAX_PIPES];
+
+		if (!unsynced_pipes[i])
+			continue;
+
+		pipe_set[0] = unsynced_pipes[i];
+		unsynced_pipes[i] = NULL;
+
+		/* Add tg to the set, search rest of the tg's for ones with
+		 * same timing, add all tgs with same timing to the group
+		 */
+		for (j = i + 1; j < pipe_count; j++) {
+			if (!unsynced_pipes[j])
+				continue;
+
+			if (resource_are_streams_timing_synchronizable(
+					unsynced_pipes[j]->stream,
+					pipe_set[0]->stream)) {
+				pipe_set[group_size] = unsynced_pipes[j];
+				unsynced_pipes[j] = NULL;
+				group_size++;
+			}
+		}
+	}
+
+	return (group_size == number_of_displays) ? true : false;
+}
+
 /**
  * Return:
  *	true -	Display(s) configuration supported.
@@ -2998,8 +3043,8 @@ bool bw_calcs(struct dc_context *ctx,
 
 	populate_initial_data(pipe, pipe_count, data);
 
-	/*TODO: this should be taken out calcs output and assigned during timing sync for pplib use*/
-	calcs_output->all_displays_in_sync = false;
+	calcs_output->all_displays_in_sync = all_displays_in_sync(pipe, pipe_count,
+								  data->number_of_displays);
 
 	if (data->number_of_displays != 0) {
 		uint8_t yclk_lvl, sclk_lvl;
-- 
2.20.1