3 files changed, 43 insertions, 1 deletions

diff --git a/drivers/video/tegra/dc/dc_priv.h b/drivers/video/tegra/dc/dc_priv.h
index 332c80f9cbb6..759d64da7052 100644
--- a/drivers/video/tegra/dc/dc_priv.h
+++ b/drivers/video/tegra/dc/dc_priv.h
@@ -372,7 +372,7 @@ void tegra_dc_disable_crc(struct tegra_dc *dc);
 void tegra_dc_set_out_pin_polars(struct tegra_dc *dc,
 				const struct tegra_dc_out_pin *pins,
 				const unsigned int n_pins);
-/* defined in dc.c, used in bandwidth.c */
+/* defined in dc.c, used in bandwidth.c and ext/dev.c */
 unsigned int tegra_dc_has_multiple_dc(void);
 
 /* defined in dc.c, used in dsi.c */
diff --git a/drivers/video/tegra/dc/ext/dev.c b/drivers/video/tegra/dc/ext/dev.c
index f9c76f8f0d0d..92e42ce32ac2 100644
--- a/drivers/video/tegra/dc/ext/dev.c
+++ b/drivers/video/tegra/dc/ext/dev.c
@@ -274,6 +274,32 @@ static int tegra_dc_ext_set_windowattr(struct tegra_dc_ext *ext,
 	return 0;
 }
 
+static struct srcu_notifier_head tegra_dc_flip_notifier_list;
+static bool init_tegra_dc_flip_notifier_list_called;
+static int __init init_tegra_dc_flip_notifier_list(void)
+{
+	srcu_init_notifier_head(&tegra_dc_flip_notifier_list);
+	init_tegra_dc_flip_notifier_list_called = true;
+	return 0;
+}
+
+pure_initcall(init_tegra_dc_flip_notifier_list);
+
+int tegra_dc_register_flip_notifier(struct notifier_block *nb)
+{
+	WARN_ON(!init_tegra_dc_flip_notifier_list_called);
+
+	return srcu_notifier_chain_register(
+			&tegra_dc_flip_notifier_list, nb);
+}
+EXPORT_SYMBOL(tegra_dc_register_flip_notifier);
+
+int tegra_dc_unregister_flip_notifier(struct notifier_block *nb)
+{
+	return srcu_notifier_chain_unregister(&tegra_dc_flip_notifier_list, nb);
+}
+EXPORT_SYMBOL(tegra_dc_unregister_flip_notifier);
+
 static void tegra_dc_ext_flip_worker(struct work_struct *work)
 {
 	struct tegra_dc_ext_flip_data *data =
@@ -327,6 +353,9 @@ static void tegra_dc_ext_flip_worker(struct work_struct *work)
 		tegra_dc_update_windows(wins, nr_win);
 		/* TODO: implement swapinterval here */
 		tegra_dc_sync_windows(wins, nr_win);
+		if (!tegra_dc_has_multiple_dc())
+			srcu_notifier_call_chain(&tegra_dc_flip_notifier_list,
+						 1UL, NULL);
 	}
 
 	for (i = 0; i < DC_N_WINDOWS; i++) {
diff --git a/drivers/video/tegra/dc/mode.c b/drivers/video/tegra/dc/mode.c
index 49cc5f5abd53..be909691b957 100644
--- a/drivers/video/tegra/dc/mode.c
+++ b/drivers/video/tegra/dc/mode.c
@@ -247,10 +247,23 @@ int tegra_dc_program_mode(struct tegra_dc *dc, struct tegra_dc_mode *mode)
 	return 0;
 }
 
+static int panel_sync_rate;
+
+int tegra_dc_get_panel_sync_rate(void)
+{
+	return panel_sync_rate;
+}
+EXPORT_SYMBOL(tegra_dc_get_panel_sync_rate);
+
 int tegra_dc_set_mode(struct tegra_dc *dc, const struct tegra_dc_mode *mode)
 {
 	memcpy(&dc->mode, mode, sizeof(dc->mode));
 
+	if (dc->out->type == TEGRA_DC_OUT_RGB)
+		panel_sync_rate = tegra_dc_calc_refresh(mode);
+	else if (dc->out->type == TEGRA_DC_OUT_DSI)
+		panel_sync_rate = dc->out->dsi->rated_refresh_rate * 1000;
+
 	print_mode(dc, mode, __func__);
 
 	return 0;