drm/amd/display: Fix DCN35 set min dispclk logic

[Why]

Setting min dispclk to 50Mhz outside clock lowering function causes
unnecessary calls to SMU to lower dispclk and causes dentist hangs when
there is no stream on the pipes.

[How]

Move the set minimum dispclk logic inside the lowering dispclk if
statement.

Fixes: 23444132 ("DCN35 set min dispclk to 50Mhz")
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Nicholas Susanto <Nicholas.Susanto@amd.com>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c

@@ -305,9 +305,6 @@ void dcn35_update_clocks(struct clk_mgr *clk_mgr_base,
 	if (new_clocks->dtbclk_en && !new_clocks->ref_dtbclk_khz)
 		new_clocks->ref_dtbclk_khz = 600000;
 
-	if (dc->debug.min_disp_clk_khz > 0 && new_clocks->dispclk_khz < dc->debug.min_disp_clk_khz)
-		new_clocks->dispclk_khz = dc->debug.min_disp_clk_khz;
-
 	/*
 	 * if it is safe to lower, but we are already in the lower state, we don't have to do anything
 	 * also if safe to lower is false, we just go in the higher state
@@ -385,6 +382,9 @@ void dcn35_update_clocks(struct clk_mgr *clk_mgr_base,
 	if (should_set_clock(safe_to_lower, new_clocks->dispclk_khz, clk_mgr_base->clks.dispclk_khz)) {
 		dcn35_disable_otg_wa(clk_mgr_base, context, safe_to_lower, true);
 
+		if (dc->debug.min_disp_clk_khz > 0 && new_clocks->dispclk_khz < dc->debug.min_disp_clk_khz)
+			new_clocks->dispclk_khz = dc->debug.min_disp_clk_khz;
+
 		clk_mgr_base->clks.dispclk_khz = new_clocks->dispclk_khz;
 		dcn35_smu_set_dispclk(clk_mgr, clk_mgr_base->clks.dispclk_khz);
 		dcn35_disable_otg_wa(clk_mgr_base, context, safe_to_lower, false);