drm/amd/display: populate hardware_release hook for dcn401

[Description]
hardare_release() is called when driver is removed. Add the missing hook for DCN401
Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Acked-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Signed-off-by: Alvin Lee <alvin.lee2@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c

@@ -1674,3 +1674,23 @@ void dcn401_unblank_stream(struct pipe_ctx *pipe_ctx,
 	if (link->local_sink && link->local_sink->sink_signal == SIGNAL_TYPE_EDP)
 		hws->funcs.edp_backlight_control(link, true);
 }
+
+void dcn401_hardware_release(struct dc *dc)
+{
+	dc_dmub_srv_fams2_update_config(dc, dc->current_state, false);
+
+	/* If pstate unsupported, or still supported
+	 * by firmware, force it supported by dcn
+	 */
+	if (dc->current_state) {
+		if ((!dc->clk_mgr->clks.p_state_change_support ||
+				dc->current_state->bw_ctx.bw.dcn.fams2_stream_count > 0) &&
+				dc->res_pool->hubbub->funcs->force_pstate_change_control)
+			dc->res_pool->hubbub->funcs->force_pstate_change_control(
+					dc->res_pool->hubbub, true, true);
+
+		dc->current_state->bw_ctx.bw.dcn.clk.p_state_change_support = true;
+		dc->clk_mgr->funcs->update_clocks(dc->clk_mgr, dc->current_state, true);
+	}
+}
+

drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.h

@@ -75,7 +75,7 @@ void dcn401_fams2_global_control_lock(struct dc *dc,
 void dcn401_fams2_update_config(struct dc *dc, struct dc_state *context, bool enable);
 void dcn401_fams2_global_control_lock_fast(union block_sequence_params *params);
 void dcn401_unblank_stream(struct pipe_ctx *pipe_ctx, struct dc_link_settings *link_settings);
-
+void dcn401_hardware_release(struct dc *dc);
 void dcn401_update_odm(struct dc *dc, struct dc_state *context,
 		struct pipe_ctx *otg_master);
 #endif /* __DC_HWSS_DCN401_H__ */

drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_init.c

@@ -79,7 +79,7 @@ static const struct hw_sequencer_funcs dcn401_funcs = {
 	.does_plane_fit_in_mall = NULL,
 	.set_backlight_level = dcn21_set_backlight_level,
 	.set_abm_immediate_disable = dcn21_set_abm_immediate_disable,
-	.hardware_release = dcn30_hardware_release,
+	.hardware_release = dcn401_hardware_release,
 	.set_pipe = dcn21_set_pipe,
 	.enable_lvds_link_output = dce110_enable_lvds_link_output,
 	.enable_tmds_link_output = dce110_enable_tmds_link_output,