drm/amd/display: Revert "Improve x86 and dmub ips handshake"

This reverts commit 1288d702.

Causes intermittent hangs during reboot stress testing.
Reviewed-by: Duncan Ma <duncan.ma@amd.com>
Acked-by: Roman Li <roman.li@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@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/clk_mgr/dcn35/dcn35_clk_mgr.c

@@ -808,34 +808,6 @@ static void dcn35_set_low_power_state(struct clk_mgr *clk_mgr_base)
 	}
 }
 
-static void dcn35_set_idle_state(struct clk_mgr *clk_mgr_base, bool allow_idle)
-{
-	struct clk_mgr_internal *clk_mgr = TO_CLK_MGR_INTERNAL(clk_mgr_base);
-	struct dc *dc = clk_mgr_base->ctx->dc;
-	uint32_t val = dcn35_smu_read_ips_scratch(clk_mgr);
-
-	if (dc->config.disable_ips == 0) {
-		val |= DMUB_IPS1_ALLOW_MASK;
-		val |= DMUB_IPS2_ALLOW_MASK;
-	} else if (dc->config.disable_ips == DMUB_IPS_DISABLE_IPS1) {
-		val = val & ~DMUB_IPS1_ALLOW_MASK;
-		val = val & ~DMUB_IPS2_ALLOW_MASK;
-	} else if (dc->config.disable_ips == DMUB_IPS_DISABLE_IPS2) {
-		val |= DMUB_IPS1_ALLOW_MASK;
-		val = val & ~DMUB_IPS2_ALLOW_MASK;
-	} else if (dc->config.disable_ips == DMUB_IPS_DISABLE_IPS2_Z10) {
-		val |= DMUB_IPS1_ALLOW_MASK;
-		val |= DMUB_IPS2_ALLOW_MASK;
-	}
-
-	if (!allow_idle) {
-		val = val & ~DMUB_IPS1_ALLOW_MASK;
-		val = val & ~DMUB_IPS2_ALLOW_MASK;
-	}
-
-	dcn35_smu_write_ips_scratch(clk_mgr, val);
-}
-
 static void dcn35_exit_low_power_state(struct clk_mgr *clk_mgr_base)
 {
 	struct clk_mgr_internal *clk_mgr = TO_CLK_MGR_INTERNAL(clk_mgr_base);
@@ -855,13 +827,6 @@ static bool dcn35_is_ips_supported(struct clk_mgr *clk_mgr_base)
 	return ips_supported;
 }
 
-static uint32_t dcn35_get_idle_state(struct clk_mgr *clk_mgr_base)
-{
-	struct clk_mgr_internal *clk_mgr = TO_CLK_MGR_INTERNAL(clk_mgr_base);
-
-	return dcn35_smu_read_ips_scratch(clk_mgr);
-}
-
 static void dcn35_init_clocks_fpga(struct clk_mgr *clk_mgr)
 {
 	dcn35_init_clocks(clk_mgr);
@@ -949,8 +914,6 @@ static struct clk_mgr_funcs dcn35_funcs = {
 	.set_low_power_state = dcn35_set_low_power_state,
 	.exit_low_power_state = dcn35_exit_low_power_state,
 	.is_ips_supported = dcn35_is_ips_supported,
-	.set_idle_state = dcn35_set_idle_state,
-	.get_idle_state = dcn35_get_idle_state
 };
 
 struct clk_mgr_funcs dcn35_fpga_funcs = {

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_smu.c

@@ -444,9 +444,9 @@ void dcn35_vbios_smu_enable_48mhz_tmdp_refclk_pwrdwn(struct clk_mgr_internal *cl
 			enable);
 }
 
-int dcn35_smu_exit_low_power_state(struct clk_mgr_internal *clk_mgr)
+void dcn35_smu_exit_low_power_state(struct clk_mgr_internal *clk_mgr)
 {
-	return dcn35_smu_send_msg_with_param(
+	dcn35_smu_send_msg_with_param(
 		clk_mgr,
 		VBIOSSMC_MSG_DispPsrExit,
 		0);
@@ -459,13 +459,3 @@ int dcn35_smu_get_ips_supported(struct clk_mgr_internal *clk_mgr)
 			VBIOSSMC_MSG_QueryIPS2Support,
 			0);
 }
-
-void dcn35_smu_write_ips_scratch(struct clk_mgr_internal *clk_mgr, uint32_t param)
-{
-	REG_WRITE(MP1_SMN_C2PMSG_71, param);
-}
-
-uint32_t dcn35_smu_read_ips_scratch(struct clk_mgr_internal *clk_mgr)
-{
-	return REG_READ(MP1_SMN_C2PMSG_71);
-}

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_smu.h

@@ -194,10 +194,8 @@ void dcn35_smu_set_zstate_support(struct clk_mgr_internal *clk_mgr, enum dcn_zst
 void dcn35_smu_set_dtbclk(struct clk_mgr_internal *clk_mgr, bool enable);
 void dcn35_vbios_smu_enable_48mhz_tmdp_refclk_pwrdwn(struct clk_mgr_internal *clk_mgr, bool enable);
 
-int dcn35_smu_exit_low_power_state(struct clk_mgr_internal *clk_mgr);
+void dcn35_smu_exit_low_power_state(struct clk_mgr_internal *clk_mgr);
 int dcn35_smu_get_ips_supported(struct clk_mgr_internal *clk_mgr);
 int dcn35_smu_get_dtbclk(struct clk_mgr_internal *clk_mgr);
 int dcn35_smu_get_dprefclk(struct clk_mgr_internal *clk_mgr);
-void dcn35_smu_write_ips_scratch(struct clk_mgr_internal *clk_mgr, uint32_t param);
-uint32_t dcn35_smu_read_ips_scratch(struct clk_mgr_internal *clk_mgr);
 #endif /* DAL_DC_35_SMU_H_ */

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

@@ -975,8 +975,6 @@ struct dc_debug_options {
 	bool replay_skip_crtc_disabled;
 	bool ignore_pg;/*do nothing, let pmfw control it*/
 	bool psp_disabled_wa;
-	unsigned int ips2_eval_delay_us;
-	unsigned int ips2_entry_delay_us;
 };
 
 struct gpu_info_soc_bounding_box_v1_0;

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

@@ -1100,64 +1100,31 @@ void dc_dmub_srv_notify_idle(const struct dc *dc, bool allow_idle)
 
 	cmd.idle_opt_notify_idle.cntl_data.driver_idle = allow_idle;
 
-	if (allow_idle) {
-		if (dc->hwss.set_idle_state)
-			dc->hwss.set_idle_state(dc, true);
-	}
-
 	dm_execute_dmub_cmd(dc->ctx, &cmd, DM_DMUB_WAIT_TYPE_WAIT);
+
+	if (allow_idle)
+		udelay(500);
 }
 
 void dc_dmub_srv_exit_low_power_state(const struct dc *dc)
 {
-	uint32_t allow_state = 0;
-	uint32_t commit_state = 0;
-
 	if (dc->debug.dmcub_emulation)
 		return;
 
 	if (!dc->idle_optimizations_allowed)
 		return;
 
-	if (dc->hwss.get_idle_state &&
-		dc->hwss.set_idle_state &&
-		dc->clk_mgr->funcs->exit_low_power_state) {
-
-		allow_state = dc->hwss.get_idle_state(dc);
-		dc->hwss.set_idle_state(dc, false);
-
-		if (allow_state & DMUB_IPS2_ALLOW_MASK) {
-			// Wait for evaluation time
-			udelay(dc->debug.ips2_eval_delay_us);
-			commit_state = dc->hwss.get_idle_state(dc);
-			if (commit_state & DMUB_IPS2_COMMIT_MASK) {
 	// Tell PMFW to exit low power state
+	if (dc->clk_mgr->funcs->exit_low_power_state)
 		dc->clk_mgr->funcs->exit_low_power_state(dc->clk_mgr);
 
-				// Wait for IPS2 entry upper bound
-				udelay(dc->debug.ips2_entry_delay_us);
-				dc->clk_mgr->funcs->exit_low_power_state(dc->clk_mgr);
-
-				do {
-					commit_state = dc->hwss.get_idle_state(dc);
-				} while (commit_state & DMUB_IPS2_COMMIT_MASK);
-
-				if (!dc_dmub_srv_is_hw_pwr_up(dc->ctx->dmub_srv, true))
-					ASSERT(0);
-
-				return;
-			}
-		}
+	// Wait for dmcub to load up
+	dc_dmub_srv_is_hw_pwr_up(dc->ctx->dmub_srv, true);
 
+	// Notify dmcub disallow idle
 	dc_dmub_srv_notify_idle(dc, false);
-		if (allow_state & DMUB_IPS1_ALLOW_MASK) {
-			do {
-				commit_state = dc->hwss.get_idle_state(dc);
-			} while (commit_state & DMUB_IPS1_COMMIT_MASK);
-		}
-	}
 
-	if (!dc_dmub_srv_is_hw_pwr_up(dc->ctx->dmub_srv, true))
-		ASSERT(0);
+	// Confirm dmu is powered up
+	dc_dmub_srv_is_hw_pwr_up(dc->ctx->dmub_srv, true);
 }
 

drivers/gpu/drm/amd/display/dc/dcn35/dcn35_init.c

@@ -120,8 +120,6 @@ static const struct hw_sequencer_funcs dcn35_funcs = {
 	.calc_blocks_to_ungate = dcn35_calc_blocks_to_ungate,
 	.block_power_control = dcn35_block_power_control,
 	.root_clock_control = dcn35_root_clock_control,
-	.set_idle_state = dcn35_set_idle_state,
-	.get_idle_state = dcn35_get_idle_state
 };
 
 static const struct hwseq_private_funcs dcn35_private_funcs = {

drivers/gpu/drm/amd/display/dc/dcn35/dcn35_resource.c

@@ -748,8 +748,6 @@ static const struct dc_debug_options debug_defaults_drv = {
 	.disable_z10 = false,
 	.ignore_pg = true,
 	.psp_disabled_wa = true,
-	.ips2_eval_delay_us = 200,
-	.ips2_entry_delay_us = 400
 };
 
 static const struct dc_panel_config panel_config_defaults = {

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

@@ -652,11 +652,19 @@ bool dcn35_apply_idle_power_optimizations(struct dc *dc, bool enable)
 
 	// TODO: review other cases when idle optimization is allowed
 
-	if (!enable)
-		dc_dmub_srv_exit_low_power_state(dc);
-	else
+	if (!enable) {
+		// Tell PMFW to exit low power state
+		if (dc->clk_mgr->funcs->exit_low_power_state)
+			dc->clk_mgr->funcs->exit_low_power_state(dc->clk_mgr);
+
+		dc_dmub_srv_is_hw_pwr_up(dc->ctx->dmub_srv, true);
+	}
+
 	dc_dmub_srv_notify_idle(dc, enable);
 
+	if (!enable)
+		dc_dmub_srv_is_hw_pwr_up(dc->ctx->dmub_srv, true);
+
 	return true;
 }
 
@@ -1189,19 +1197,3 @@ void dcn35_optimize_bandwidth(
 			dc->hwss.root_clock_control(dc, &pg_update_state, false);
 	}
 }
-
-void dcn35_set_idle_state(const struct dc *dc, bool allow_idle)
-{
-	// TODO: Find a more suitable communcation
-	if (dc->clk_mgr->funcs->set_idle_state)
-		dc->clk_mgr->funcs->set_idle_state(dc->clk_mgr, allow_idle);
-}
-
-uint32_t dcn35_get_idle_state(const struct dc *dc)
-{
-	// TODO: Find a more suitable communcation
-	if (dc->clk_mgr->funcs->get_idle_state)
-		return dc->clk_mgr->funcs->get_idle_state(dc->clk_mgr);
-
-	return 0;
-}

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

@@ -81,7 +81,4 @@ void dcn35_dsc_pg_control(
 		struct dce_hwseq *hws,
 		unsigned int dsc_inst,
 		bool power_on);
-
-void dcn35_set_idle_state(const struct dc *dc, bool allow_idle);
-uint32_t dcn35_get_idle_state(const struct dc *dc);
 #endif /* __DC_HWSS_DCN35_H__ */

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

@@ -418,8 +418,7 @@ 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,
 			const struct dc_state *new_ctx);

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

@@ -262,8 +262,6 @@ 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);