drm/amd/display: add dp dto programming function to dccg

[WHY&HOW]
Add support for programming dp dto via dccg.
Reviewed-by: Jun Lei <jun.lei@amd.com>
Acked-by: Stylon Wang <stylon.wang@amd.com>
Signed-off-by: Dillon Varone <dillon.varone@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/dce/dce_clock_source.c

@@ -34,6 +34,7 @@
 
 #include "dce_clock_source.h"
 #include "clk_mgr.h"
+#include "dccg.h"
 
 #include "reg_helper.h"
 

drivers/gpu/drm/amd/display/dc/inc/hw/dccg.h

@@ -56,6 +56,13 @@ enum dentist_dispclk_change_mode {
 	DISPCLK_CHANGE_MODE_RAMPING,
 };
 
+struct dp_dto_params {
+	int otg_inst;
+	enum signal_type signal;
+	long long pixclk_hz;
+	long long refclk_hz;
+};
+
 enum pixel_rate_div {
    PIXEL_RATE_DIV_BY_1 = 0,
    PIXEL_RATE_DIV_BY_2 = 1,
@@ -182,6 +189,9 @@ struct dccg_funcs {
 			struct dccg *dccg,
 			uint32_t stream_enc_inst,
 			uint32_t link_enc_inst);
+	void (*set_dp_dto)(
+			struct dccg *dccg,
+			const struct dp_dto_params *params);
 };
 
 #endif //__DAL_DCCG_H__