drm/amd/display: Reorder FCLK P-state switch sequence for DCN32

[WHY?]
In some cases, DCFCLK hardmin requests are not acknowledged by SMU as
the requested clock does not have a compatible ratio with current FCLK,
and it cannot be changed as FCLK P-state is not allowed.

[HOW?]
Allow FCLK p-state change prior to changing DCFCLK hardmin.
Reviewed-by: Alvin Lee <Alvin.Lee2@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Dillon Varone <Dillon.Varone@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c

@@ -333,6 +333,21 @@ static void dcn32_update_clocks(struct clk_mgr *clk_mgr_base,
 		if (enter_display_off == safe_to_lower)
 			dcn30_smu_set_num_of_displays(clk_mgr, display_count);
 
+		clk_mgr_base->clks.fclk_prev_p_state_change_support = clk_mgr_base->clks.fclk_p_state_change_support;
+
+		total_plane_count = clk_mgr_helper_get_active_plane_cnt(dc, context);
+		fclk_p_state_change_support = new_clocks->fclk_p_state_change_support || (total_plane_count == 0);
+
+		if (should_update_pstate_support(safe_to_lower, fclk_p_state_change_support, clk_mgr_base->clks.fclk_p_state_change_support)) {
+			clk_mgr_base->clks.fclk_p_state_change_support = fclk_p_state_change_support;
+
+			/* To enable FCLK P-state switching, send FCLK_PSTATE_NOTSUPPORTED message to PMFW */
+			if (clk_mgr_base->ctx->dce_version != DCN_VERSION_3_21 && clk_mgr_base->clks.fclk_p_state_change_support && update_fclk) {
+				/* Handle the code for sending a message to PMFW that FCLK P-state change is supported */
+				dcn32_smu_send_fclk_pstate_message(clk_mgr, FCLK_PSTATE_SUPPORTED);
+			}
+		}
+
 		if (dc->debug.force_min_dcfclk_mhz > 0)
 			new_clocks->dcfclk_khz = (new_clocks->dcfclk_khz > (dc->debug.force_min_dcfclk_mhz * 1000)) ?
 					new_clocks->dcfclk_khz : (dc->debug.force_min_dcfclk_mhz * 1000);
@@ -352,7 +367,6 @@ static void dcn32_update_clocks(struct clk_mgr *clk_mgr_base,
 			clk_mgr_base->clks.socclk_khz = new_clocks->socclk_khz;
 
 		clk_mgr_base->clks.prev_p_state_change_support = clk_mgr_base->clks.p_state_change_support;
-		clk_mgr_base->clks.fclk_prev_p_state_change_support = clk_mgr_base->clks.fclk_p_state_change_support;
 		clk_mgr_base->clks.prev_num_ways = clk_mgr_base->clks.num_ways;
 
 		if (clk_mgr_base->clks.num_ways != new_clocks->num_ways &&
@@ -361,9 +375,8 @@ static void dcn32_update_clocks(struct clk_mgr *clk_mgr_base,
 			dcn32_smu_send_cab_for_uclk_message(clk_mgr, clk_mgr_base->clks.num_ways);
 		}
 
-		total_plane_count = clk_mgr_helper_get_active_plane_cnt(dc, context);
+
 		p_state_change_support = new_clocks->p_state_change_support || (total_plane_count == 0);
-		fclk_p_state_change_support = new_clocks->fclk_p_state_change_support || (total_plane_count == 0);
 		if (should_update_pstate_support(safe_to_lower, p_state_change_support, clk_mgr_base->clks.p_state_change_support)) {
 			clk_mgr_base->clks.p_state_change_support = p_state_change_support;
 
@@ -373,16 +386,15 @@ static void dcn32_update_clocks(struct clk_mgr *clk_mgr_base,
 						clk_mgr_base->bw_params->clk_table.entries[clk_mgr_base->bw_params->clk_table.num_entries - 1].memclk_mhz);
 		}
 
-		if (should_update_pstate_support(safe_to_lower, fclk_p_state_change_support, clk_mgr_base->clks.fclk_p_state_change_support) &&
-				clk_mgr_base->ctx->dce_version != DCN_VERSION_3_21) {
-			clk_mgr_base->clks.fclk_p_state_change_support = fclk_p_state_change_support;
+		/* Always update saved value, even if new value not set due to P-State switching unsupported. Also check safe_to_lower for FCLK */
+		if (safe_to_lower && (clk_mgr_base->clks.fclk_p_state_change_support != clk_mgr_base->clks.fclk_prev_p_state_change_support)) {
+			update_fclk = true;
+		}
 
-			/* To disable FCLK P-state switching, send FCLK_PSTATE_NOTSUPPORTED message to PMFW */
-			if (clk_mgr_base->ctx->dce_version != DCN_VERSION_3_21 && !clk_mgr_base->clks.fclk_p_state_change_support) {
+		if (clk_mgr_base->ctx->dce_version != DCN_VERSION_3_21 && !clk_mgr_base->clks.fclk_p_state_change_support && update_fclk) {
 			/* Handle code for sending a message to PMFW that FCLK P-state change is not supported */
 			dcn32_smu_send_fclk_pstate_message(clk_mgr, FCLK_PSTATE_NOTSUPPORTED);
 		}
-		}
 
 		/* Always update saved value, even if new value not set due to P-State switching unsupported */
 		if (should_set_clock(safe_to_lower, new_clocks->dramclk_khz, clk_mgr_base->clks.dramclk_khz)) {
@@ -390,21 +402,11 @@ static void dcn32_update_clocks(struct clk_mgr *clk_mgr_base,
 			update_uclk = true;
 		}
 
-		/* Always update saved value, even if new value not set due to P-State switching unsupported. Also check safe_to_lower for FCLK */
-		if (safe_to_lower && (clk_mgr_base->clks.fclk_p_state_change_support != clk_mgr_base->clks.fclk_prev_p_state_change_support)) {
-			update_fclk = true;
-		}
-
 		/* set UCLK to requested value if P-State switching is supported, or to re-enable P-State switching */
 		if (clk_mgr_base->clks.p_state_change_support &&
 				(update_uclk || !clk_mgr_base->clks.prev_p_state_change_support))
 			dcn32_smu_set_hard_min_by_freq(clk_mgr, PPCLK_UCLK, khz_to_mhz_ceil(clk_mgr_base->clks.dramclk_khz));
 
-		if (clk_mgr_base->ctx->dce_version != DCN_VERSION_3_21 && clk_mgr_base->clks.fclk_p_state_change_support && update_fclk) {
-			/* Handle the code for sending a message to PMFW that FCLK P-state change is supported */
-			dcn32_smu_send_fclk_pstate_message(clk_mgr, FCLK_PSTATE_SUPPORTED);
-		}
-
 		if (clk_mgr_base->clks.num_ways != new_clocks->num_ways &&
 				clk_mgr_base->clks.num_ways > new_clocks->num_ways) {
 			clk_mgr_base->clks.num_ways = new_clocks->num_ways;