drm/amd/display: ensure OTG is locked before proceeding

also remove tg lock at init_hw as not all OTG is running
Signed-off-by: Tony Cheng <tony.cheng@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

@@ -283,13 +283,11 @@ static void init_hw(struct core_dc *dc)
 				dc->res_pool->mpcc[i];
 		struct mpcc_cfg mpcc_cfg;
 
-		tg->funcs->lock(tg);
 		mpcc_cfg.opp_id = 0xf;
 		mpcc_cfg.top_dpp_id = 0xf;
 		mpcc_cfg.bot_mpcc_id = 0xf;
 		mpcc_cfg.top_of_tree = true;
 		mpcc->funcs->set(mpcc, &mpcc_cfg);
-		tg->funcs->unlock(tg);
 
 		tg->funcs->disable_vga(tg);
 		/* Blank controller using driver code instead of

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_timing_generator.c

@@ -573,6 +573,10 @@ static void tgn10_lock(struct timing_generator *tg)
 			OTG_MASTER_UPDATE_LOCK_SEL, tg->inst);
 	REG_SET(OTG_MASTER_UPDATE_LOCK, 0,
 			OTG_MASTER_UPDATE_LOCK, 1);
+
+	REG_WAIT(OTG_MASTER_UPDATE_LOCK,
+			UPDATE_LOCK_STATUS, 1,
+			1, 100);
 }
 
 static void tgn10_unlock(struct timing_generator *tg)

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_timing_generator.h

@@ -140,6 +140,7 @@ struct dcn_tg_registers {
 	SF(OTG0_OTG_BLANK_CONTROL, OTG_BLANK_DE_MODE, mask_sh),\
 	SF(OTG0_OTG_BLANK_CONTROL, OTG_CURRENT_BLANK_STATE, mask_sh),\
 	SF(OTG0_OTG_MASTER_UPDATE_LOCK, OTG_MASTER_UPDATE_LOCK, mask_sh),\
+	SF(OTG0_OTG_MASTER_UPDATE_LOCK, UPDATE_LOCK_STATUS, mask_sh),\
 	SF(OTG0_OTG_GLOBAL_CONTROL0, OTG_MASTER_UPDATE_LOCK_SEL, mask_sh),\
 	SF(OTG0_OTG_DOUBLE_BUFFER_CONTROL, OTG_UPDATE_PENDING, mask_sh),\
 	SF(OTG0_OTG_DOUBLE_BUFFER_CONTROL, OTG_BLANK_DATA_DOUBLE_BUFFER_EN, mask_sh),\
@@ -233,6 +234,7 @@ struct dcn_tg_registers {
 	type OTG_BLANK_DE_MODE;\
 	type OTG_CURRENT_BLANK_STATE;\
 	type OTG_MASTER_UPDATE_LOCK;\
+	type UPDATE_LOCK_STATUS;\
 	type OTG_UPDATE_PENDING;\
 	type OTG_MASTER_UPDATE_LOCK_SEL;\
 	type OTG_BLANK_DATA_DOUBLE_BUFFER_EN;\