drm/amd/display: add global master update lock for DCN2

[why]
when an update programming sequence requires both
front end and back end pipe to be updated synchronously,
a global update lock needs to be set to ensure that
we don't get a frame with only front end update but
not the back end update.

[how]
setup global lock parameters on enable_stream_timing.
enable global lock when pipe_control_lock_global is called.
disable global lock when pipe_control_lock is called.

Signed-off-by: Wenjing Liu <Wenjing.Liu@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c

@@ -727,6 +727,10 @@ enum dc_status dcn20_enable_stream_timing(
 			pipe_ctx->stream->signal,
 			true);
 
+	if (pipe_ctx->stream_res.tg->funcs->setup_global_lock)
+		pipe_ctx->stream_res.tg->funcs->setup_global_lock(
+				pipe_ctx->stream_res.tg);
+
 	/* program otg blank color */
 	color_space = stream->output_color_space;
 	color_space_to_black_color(dc, color_space, &black_color);

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_optc.c

@@ -330,6 +330,65 @@ void optc2_triplebuffer_unlock(struct timing_generator *optc)
 
 }
 
+
+void optc2_setup_global_lock(struct timing_generator *optc)
+{
+	struct optc *optc1 = DCN10TG_FROM_TG(optc);
+	uint32_t v_blank_start = 0;
+	uint32_t h_blank_start = 0, h_total = 0;
+
+	REG_SET(OTG_GLOBAL_CONTROL1, 0, MASTER_UPDATE_LOCK_DB_EN, 1);
+
+	REG_SET(OTG_GLOBAL_CONTROL2, 0, DIG_UPDATE_LOCATION, 20);
+
+	REG_GET(OTG_V_BLANK_START_END, OTG_V_BLANK_START, &v_blank_start);
+
+	REG_GET(OTG_H_BLANK_START_END, OTG_H_BLANK_START, &h_blank_start);
+
+	REG_GET(OTG_H_TOTAL, OTG_H_TOTAL, &h_total);
+	REG_UPDATE_2(OTG_GLOBAL_CONTROL1,
+			MASTER_UPDATE_LOCK_DB_X,
+			h_blank_start - 200 - 1,
+			MASTER_UPDATE_LOCK_DB_Y,
+			v_blank_start - 1);
+}
+
+void optc2_lock_global(struct timing_generator *optc)
+{
+	struct optc *optc1 = DCN10TG_FROM_TG(optc);
+
+	REG_UPDATE(OTG_GLOBAL_CONTROL2, GLOBAL_UPDATE_LOCK_EN, 1);
+
+	REG_SET(OTG_GLOBAL_CONTROL0, 0,
+			OTG_MASTER_UPDATE_LOCK_SEL, optc->inst);
+	REG_SET(OTG_MASTER_UPDATE_LOCK, 0,
+			OTG_MASTER_UPDATE_LOCK, 1);
+
+	/* Should be fast, status does not update on maximus */
+	if (optc->ctx->dce_environment != DCE_ENV_FPGA_MAXIMUS)
+		REG_WAIT(OTG_MASTER_UPDATE_LOCK,
+				UPDATE_LOCK_STATUS, 1,
+				1, 10);
+}
+
+void optc2_lock(struct timing_generator *optc)
+{
+	struct optc *optc1 = DCN10TG_FROM_TG(optc);
+
+	REG_UPDATE(OTG_GLOBAL_CONTROL2, GLOBAL_UPDATE_LOCK_EN, 0);
+
+	REG_SET(OTG_GLOBAL_CONTROL0, 0,
+			OTG_MASTER_UPDATE_LOCK_SEL, optc->inst);
+	REG_SET(OTG_MASTER_UPDATE_LOCK, 0,
+			OTG_MASTER_UPDATE_LOCK, 1);
+
+	/* Should be fast, status does not update on maximus */
+	if (optc->ctx->dce_environment != DCE_ENV_FPGA_MAXIMUS)
+		REG_WAIT(OTG_MASTER_UPDATE_LOCK,
+				UPDATE_LOCK_STATUS, 1,
+				1, 10);
+}
+
 void optc2_lock_doublebuffer_enable(struct timing_generator *optc)
 {
 	struct optc *optc1 = DCN10TG_FROM_TG(optc);
@@ -424,8 +483,10 @@ static struct timing_generator_funcs dcn20_tg_funcs = {
 		.triplebuffer_lock = optc2_triplebuffer_lock,
 		.triplebuffer_unlock = optc2_triplebuffer_unlock,
 		.disable_reset_trigger = optc1_disable_reset_trigger,
-		.lock = optc1_lock,
+		.lock = optc2_lock,
 		.unlock = optc1_unlock,
+		.lock_global = optc2_lock_global,
+		.setup_global_lock = optc2_setup_global_lock,
 		.lock_doublebuffer_enable = optc2_lock_doublebuffer_enable,
 		.lock_doublebuffer_disable = optc2_lock_doublebuffer_disable,
 		.enable_optc_clock = optc1_enable_optc_clock,

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_optc.h

@@ -104,6 +104,9 @@ void optc2_get_optc_source(struct timing_generator *optc,
 
 void optc2_triplebuffer_lock(struct timing_generator *optc);
 void optc2_triplebuffer_unlock(struct timing_generator *optc);
+void optc2_lock(struct timing_generator *optc);
+void optc2_lock_global(struct timing_generator *optc);
+void optc2_setup_global_lock(struct timing_generator *optc);
 void optc2_lock_doublebuffer_disable(struct timing_generator *optc);
 void optc2_lock_doublebuffer_enable(struct timing_generator *optc);
 void optc2_program_manual_trigger(struct timing_generator *optc);

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

@@ -184,8 +184,10 @@ struct timing_generator_funcs {
 	bool (*did_triggered_reset_occur)(struct timing_generator *tg);
 	void (*setup_global_swap_lock)(struct timing_generator *tg,
 							const struct dcp_gsl_params *gsl_params);
+	void (*setup_global_lock)(struct timing_generator *tg);
 	void (*unlock)(struct timing_generator *tg);
 	void (*lock)(struct timing_generator *tg);
+	void (*lock_global)(struct timing_generator *tg);
 	void (*lock_doublebuffer_disable)(struct timing_generator *tg);
 	void (*lock_doublebuffer_enable)(struct timing_generator *tg);
 #if defined(CONFIG_DRM_AMD_DC_DCN2_0)

drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h

@@ -205,6 +205,7 @@ struct hw_sequencer_funcs {
 				struct dc *dc,
 				struct pipe_ctx *pipe,
 				bool lock);
+
 	void (*pipe_control_lock_global)(
 				struct dc *dc,
 				struct pipe_ctx *pipe,