drm/amd/display: revert order change of HUBP and MPC disable

- root cause was we disable opp clk in MPC disconnect
- hubp_blank is not double buffered, so we can't blank until MPC disconnect or we have risk of underflow

Signed-off-by: Tony Cheng <tony.cheng@amd.com>
Reviewed-by: Eric Yang <eric.yang2@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/dce/dce_hwseq.h

@@ -288,7 +288,6 @@ struct dce_hwseq_registers {
 	HWS_SF1(OTG0_, PHYPLL_PIXEL_RATE_CNTL, PHYPLL_PIXEL_RATE_SOURCE, mask_sh), \
 	HWS_SF(OTG0_, OTG_GLOBAL_SYNC_STATUS, VUPDATE_NO_LOCK_EVENT_CLEAR, mask_sh), \
 	HWS_SF(OTG0_, OTG_GLOBAL_SYNC_STATUS, VUPDATE_NO_LOCK_EVENT_OCCURRED, mask_sh), \
-	HWS_SF(HUBP0_, DCHUBP_CNTL, HUBP_NO_OUTSTANDING_REQ, mask_sh), \
 	HWS_SF(HUBP0_, DCHUBP_CNTL, HUBP_VTG_SEL, mask_sh), \
 	HWS_SF(HUBP0_, HUBP_CLK_CNTL, HUBP_CLOCK_ENABLE, mask_sh), \
 	HWS_SF(DPP_TOP0_, DPP_CONTROL, DPP_CLOCK_ENABLE, mask_sh), \
@@ -351,7 +350,6 @@ struct dce_hwseq_registers {
 #define HWSEQ_DCN_REG_FIELD_LIST(type) \
 	type VUPDATE_NO_LOCK_EVENT_CLEAR; \
 	type VUPDATE_NO_LOCK_EVENT_OCCURRED; \
-	type HUBP_NO_OUTSTANDING_REQ; \
 	type HUBP_VTG_SEL; \
 	type HUBP_CLOCK_ENABLE; \
 	type DPP_CLOCK_ENABLE; \

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

@@ -436,29 +436,17 @@ static void reset_back_end_for_pipe(
 					pipe_ctx->pipe_idx, pipe_ctx->tg->inst);
 }
 
-static void reset_front_end(
+static void plane_atomic_stop(
 		struct core_dc *dc,
 		int fe_idx)
 {
-	struct dce_hwseq *hws = dc->hwseq;
 	struct mpcc_cfg mpcc_cfg;
 	struct mem_input *mi = dc->res_pool->mis[fe_idx];
 	struct transform *xfm = dc->res_pool->transforms[fe_idx];
 	struct mpcc *mpcc = dc->res_pool->mpcc[fe_idx];
 	struct timing_generator *tg = dc->res_pool->timing_generators[mpcc->opp_id];
-	unsigned int opp_id = mpcc->opp_id;
-
-	/*Already reset*/
-	if (opp_id == 0xf)
-		return;
-
-	tg->funcs->lock(tg);
 
 	mi->funcs->dcc_control(mi, false, false);
-	mi->funcs->set_blank(mi, true);
-	REG_WAIT(DCHUBP_CNTL[fe_idx],
-			HUBP_NO_OUTSTANDING_REQ, 1,
-			1, 200);
 
 	mpcc_cfg.opp_id = 0xf;
 	mpcc_cfg.top_dpp_id = 0xf;
@@ -466,23 +454,44 @@ static void reset_front_end(
 	mpcc_cfg.top_of_tree = tg->inst == mpcc->inst;
 	mpcc->funcs->set(mpcc, &mpcc_cfg);
 
+	xfm->funcs->transform_reset(xfm);
+}
+
+static void reset_front_end(
+		struct core_dc *dc,
+		int fe_idx)
+{
+	struct dce_hwseq *hws = dc->hwseq;
+	struct mem_input *mi = dc->res_pool->mis[fe_idx];
+	struct mpcc *mpcc = dc->res_pool->mpcc[fe_idx];
+	struct timing_generator *tg = dc->res_pool->timing_generators[mpcc->opp_id];
+	unsigned int opp_id = mpcc->opp_id;
+
+	/*Already reset*/
+	if (opp_id == 0xf)
+		return;
+
+	tg->funcs->lock(tg);
+
+	plane_atomic_stop(dc, fe_idx);
+
 	REG_UPDATE(OTG_GLOBAL_SYNC_STATUS[tg->inst], VUPDATE_NO_LOCK_EVENT_CLEAR, 1);
 	tg->funcs->unlock(tg);
 	REG_WAIT(OTG_GLOBAL_SYNC_STATUS[tg->inst], VUPDATE_NO_LOCK_EVENT_OCCURRED, 1, 20000, 200000);
 
 	mpcc->funcs->wait_for_idle(mpcc);
 
+	mi->funcs->set_blank(mi, true);
+
 	REG_UPDATE(HUBP_CLK_CNTL[fe_idx],
 			HUBP_CLOCK_ENABLE, 0);
 	REG_UPDATE(DPP_CONTROL[fe_idx],
 			DPP_CLOCK_ENABLE, 0);
 
-	if (mpcc_cfg.top_of_tree)
+	if (tg->inst == mpcc->inst)
 		REG_UPDATE(OPP_PIPE_CONTROL[opp_id],
 				OPP_PIPE_CLOCK_EN, 0);
 
-	xfm->funcs->transform_reset(xfm);
-
 	dm_logger_write(dc->ctx->logger, LOG_DC,
 					"Reset front end %d\n",
 					fe_idx);

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_mem_input.c

@@ -46,6 +46,11 @@ static void min10_set_blank(struct mem_input *mem_input, bool blank)
 	REG_UPDATE_2(DCHUBP_CNTL,
 			HUBP_BLANK_EN, blank_en,
 			HUBP_TTU_DISABLE, blank_en);
+
+	if (blank)
+		REG_WAIT(DCHUBP_CNTL,
+				HUBP_NO_OUTSTANDING_REQ, 1,
+				1, 200);
 }
 
 static void min10_vready_workaround(struct mem_input *mem_input,

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_mem_input.h

@@ -304,6 +304,7 @@ struct dcn_mi_registers {
 #define MI_MASK_SH_LIST_DCN(mask_sh)\
 	MI_SF(HUBP0_DCHUBP_CNTL, HUBP_BLANK_EN, mask_sh),\
 	MI_SF(HUBP0_DCHUBP_CNTL, HUBP_TTU_DISABLE, mask_sh),\
+	MI_SF(HUBP0_DCHUBP_CNTL, HUBP_NO_OUTSTANDING_REQ, mask_sh),\
 	MI_SF(HUBP0_DCSURF_ADDR_CONFIG, NUM_PIPES, mask_sh),\
 	MI_SF(HUBP0_DCSURF_ADDR_CONFIG, NUM_BANKS, mask_sh),\
 	MI_SF(HUBP0_DCSURF_ADDR_CONFIG, PIPE_INTERLEAVE, mask_sh),\
@@ -463,6 +464,7 @@ struct dcn_mi_registers {
 #define DCN_MI_REG_FIELD_LIST(type) \
 	type HUBP_BLANK_EN;\
 	type HUBP_TTU_DISABLE;\
+	type HUBP_NO_OUTSTANDING_REQ;\
 	type NUM_PIPES;\
 	type NUM_BANKS;\
 	type PIPE_INTERLEAVE;\