drm/amd/display: sometime VtotalMin less than VTotal (rounding issue)

Signed-off-by: Charlene Liu <charlene.liu@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Reviewed-by: Jordan Lazare <Jordan.Lazare@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
index 2026ef3..7a0731e 100644 (file)
--- a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
+++ b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
@@ -905,7 +905,6 @@ void mod_freesync_notify_mode_change(struct mod_freesync *mod_freesync,
        core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync);
 
        for (stream_index = 0; stream_index < num_streams; stream_index++) {
-
                map_index = map_index_from_stream(core_freesync,
                                streams[stream_index]);
 
@@ -913,11 +912,12 @@ void mod_freesync_notify_mode_change(struct mod_freesync *mod_freesync,
 
                if (core_freesync->map[map_index].caps->supported) {
                        /* Update the field rate for new timing */
-                       state->nominal_refresh_rate_in_micro_hz = 1000000 *
-                               div64_u64(div64_u64((streams[stream_index]->
-                               timing.pix_clk_khz * 1000),
-                               streams[stream_index]->timing.v_total),
-                               streams[stream_index]->timing.h_total);
+                       unsigned long long temp;
+                       temp = streams[stream_index]->timing.pix_clk_khz;
+                       temp *= 1000ULL * 1000ULL * 1000ULL;
+                       temp = div_u64(temp, streams[stream_index]->timing.h_total);
+                       temp = div_u64(temp, streams[stream_index]->timing.v_total);
+                       state->nominal_refresh_rate_in_micro_hz = (unsigned int) temp;
 
                        /* Update the stream */
                        update_stream(core_freesync, streams[stream_index]);