drm/amd/display: Add a check for idle power optimization

[why]
Need a helper function to check idle power is allowed
so that dc doesn't access any registers that are power-gated.

[how]
Implement helper function to check idle power optimization.
Enable a hook to check if detection is allowed.

V2:
Add function hooks for set and get idle states.
Check if function hook was properly initialized.

Reviewed-by: Aric Cyr <aric.cyr@amd.com>
Reviewed-by: Nicholas Choi <nicholas.choi@amd.com>
Acked-by: Roman Li <roman.li@amd.com>
Signed-off-by: Sung Joon Kim <sungkim@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: Sung Joon Kim

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -4884,6 +4884,9 @@ void dc_allow_idle_optimizations(struct dc *dc, bool allow)
 	if (dc->debug.disable_idle_power_optimizations)
 		return;
 
+	if (dc->caps.ips_support && dc->config.disable_ips)
+		return;
+
 	if (dc->clk_mgr != NULL && dc->clk_mgr->funcs->is_smu_present)
 		if (!dc->clk_mgr->funcs->is_smu_present(dc->clk_mgr))
 			return;
@@ -4895,6 +4898,26 @@ void dc_allow_idle_optimizations(struct dc *dc, bool allow)
 		dc->idle_optimizations_allowed = allow;
 }
 
+bool dc_dmub_is_ips_idle_state(struct dc *dc)
+{
+	uint32_t idle_state = 0;
+
+	if (dc->debug.disable_idle_power_optimizations)
+		return false;
+
+	if (!dc->caps.ips_support || dc->config.disable_ips)
+		return false;
+
+	if (dc->hwss.get_idle_state)
+		idle_state = dc->hwss.get_idle_state(dc);
+
+	if ((idle_state & DMUB_IPS1_ALLOW_MASK) ||
+		(idle_state & DMUB_IPS2_ALLOW_MASK))
+		return true;
+
+	return false;
+}
+
 /* set min and max memory clock to lowest and highest DPM level, respectively */
 void dc_unlock_memory_clock_frequency(struct dc *dc)
 {

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

@@ -2315,6 +2315,7 @@ bool dc_is_plane_eligible_for_idle_optimizations(struct dc *dc, struct dc_plane_
 				struct dc_cursor_attributes *cursor_attr);
 
 void dc_allow_idle_optimizations(struct dc *dc, bool allow);
+bool dc_dmub_is_ips_idle_state(struct dc *dc);
 
 /* set min and max memory clock to lowest and highest DPM level, respectively */
 void dc_unlock_memory_clock_frequency(struct dc *dc);

drivers/gpu/drm/amd/display/dc/hwss/dcn31/dcn31_hwseq.c

@@ -585,7 +585,9 @@ void dcn31_reset_hw_ctx_wrap(
 			struct clock_source *old_clk = pipe_ctx_old->clock_source;
 
 			/* Reset pipe which is seamless boot stream. */
-			if (!pipe_ctx_old->plane_state) {
+			if (!pipe_ctx_old->plane_state &&
+				dc->res_pool->hubbub->funcs->program_det_size &&
+				dc->res_pool->hubbub->funcs->wait_for_det_apply) {
 				dc->res_pool->hubbub->funcs->program_det_size(
 					dc->res_pool->hubbub, pipe_ctx_old->plane_res.hubp->inst, 0);
 				/* Wait det size changed. */

drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.c

@@ -629,12 +629,8 @@ void dcn35_power_down_on_boot(struct dc *dc)
 	if (dc->clk_mgr->funcs->set_low_power_state)
 		dc->clk_mgr->funcs->set_low_power_state(dc->clk_mgr);
 
-	if (dc->clk_mgr->clks.pwr_state == DCN_PWR_STATE_LOW_POWER) {
-		if (!dc->idle_optimizations_allowed) {
-			dc_dmub_srv_notify_idle(dc, true);
-			dc->idle_optimizations_allowed = true;
-		}
-	}
+	if (dc->clk_mgr->clks.pwr_state == DCN_PWR_STATE_LOW_POWER)
+		dc_allow_idle_optimizations(dc, true);
 }
 
 bool dcn35_apply_idle_power_optimizations(struct dc *dc, bool enable)

drivers/gpu/drm/amd/display/dc/hwss/hw_sequencer.h

@@ -418,6 +418,8 @@ struct hw_sequencer_funcs {
 		struct pg_block_update *update_state, bool power_on);
 	void (*root_clock_control)(struct dc *dc,
 		struct pg_block_update *update_state, bool power_on);
+	void (*set_idle_state)(const struct dc *dc, bool allow_idle);
+	uint32_t (*get_idle_state)(const struct dc *dc);
 
 	bool (*is_pipe_topology_transition_seamless)(struct dc *dc,
 			const struct dc_state *cur_ctx,

drivers/gpu/drm/amd/display/dc/inc/hw/clk_mgr.h

@@ -262,6 +262,8 @@ struct clk_mgr_funcs {
 	void (*set_low_power_state)(struct clk_mgr *clk_mgr);
 	void (*exit_low_power_state)(struct clk_mgr *clk_mgr);
 	bool (*is_ips_supported)(struct clk_mgr *clk_mgr);
+	void (*set_idle_state)(struct clk_mgr *clk_mgr, bool allow_idle);
+	uint32_t (*get_idle_state)(struct clk_mgr *clk_mgr);
 
 	void (*init_clocks)(struct clk_mgr *clk_mgr);
 

drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c

@@ -352,6 +352,7 @@ static bool dmub_srv_hw_setup(struct dmub_srv *dmub, enum dmub_asic asic)
 			funcs->init_reg_offsets = dmub_srv_dcn35_regs_init;
 
 			funcs->is_hw_powered_up = dmub_dcn35_is_hw_powered_up;
+			funcs->should_detect = dmub_dcn35_should_detect;
 			break;
 
 	default: