drm/amd/display: add mechanism to skip DCN init

[Why]
If optimized init is done in FW. DCN init be skipped in driver. This
need to be communicated between driver and fw and maintain backwards
compatibility.

[How]
Use DMUB scratch 0 bit 2 to indicate optimized init done in fw and
use DMUB scatch 4 bit 0 to indicate drive supports the optimized flow
so FW will perform it.
Signed-off-by: Eric Yang <Eric.Yang2@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -2681,6 +2681,7 @@ void dc_interrupt_ack(struct dc *dc, enum dc_irq_source src)
 	dal_irq_service_ack(dc->res_pool->irqs, src);
 }
 
+
 void dc_set_power_state(
 	struct dc *dc,
 	enum dc_acpi_cm_power_state power_state)
@@ -2692,9 +2693,6 @@ void dc_set_power_state(
 	case DC_ACPI_CM_POWER_STATE_D0:
 		dc_resource_state_construct(dc, dc->current_state);
 
-		if (dc->ctx->dmub_srv)
-			dc_dmub_srv_wait_phy_init(dc->ctx->dmub_srv);
-
 		dc->hwss.init_hw(dc);
 
 		if (dc->hwss.init_sys_ctx != NULL &&

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

@@ -106,29 +106,17 @@ void dc_dmub_srv_wait_idle(struct dc_dmub_srv *dc_dmub_srv)
 		DC_ERROR("Error waiting for DMUB idle: status=%d\n", status);
 }
 
-void dc_dmub_srv_wait_phy_init(struct dc_dmub_srv *dc_dmub_srv)
+bool dc_dmub_srv_optimized_init_done(struct dc_dmub_srv *dc_dmub_srv)
 {
-	struct dmub_srv *dmub = dc_dmub_srv->dmub;
-	struct dc_context *dc_ctx = dc_dmub_srv->ctx;
-	enum dmub_status status;
+	struct dmub_srv *dmub;
+	union dmub_fw_boot_status status;
 
-	for (;;) {
-		/* Wait up to a second for PHY init. */
-		status = dmub_srv_wait_for_phy_init(dmub, 1000000);
-		if (status == DMUB_STATUS_OK)
-			/* Initialization OK */
-			break;
+	if (!dc_dmub_srv || !dc_dmub_srv->dmub)
+		return false;
 
-		DC_ERROR("DMCUB PHY init failed: status=%d\n", status);
-		ASSERT(0);
+	dmub = dc_dmub_srv->dmub;
 
-		if (status != DMUB_STATUS_TIMEOUT)
-			/*
-			 * Server likely initialized or we don't have
-			 * DMCUB HW support - this won't end.
-			 */
-			break;
+	status = dmub->hw_funcs.get_fw_status(dmub);
 
-		/* Continue spinning so we don't hang the ASIC. */
-	}
+	return status.bits.optimized_init_done;
 }

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

@@ -56,4 +56,6 @@ void dc_dmub_srv_wait_idle(struct dc_dmub_srv *dc_dmub_srv);
 
 void dc_dmub_srv_wait_phy_init(struct dc_dmub_srv *dc_dmub_srv);
 
+bool dc_dmub_srv_optimized_init_done(struct dc_dmub_srv *dc_dmub_srv);
+
 #endif /* _DMUB_DC_SRV_H_ */

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

@@ -1288,7 +1288,9 @@ void dcn10_init_hw(struct dc *dc)
 	if (!dcb->funcs->is_accelerated_mode(dcb))
 		hws->funcs.disable_vga(dc->hwseq);
 
-	hws->funcs.bios_golden_init(dc);
+	if (!dc_dmub_srv_optimized_init_done(dc->ctx->dmub_srv))
+		hws->funcs.bios_golden_init(dc);
+
 	if (dc->ctx->dc_bios->fw_info_valid) {
 		res_pool->ref_clocks.xtalin_clock_inKhz =
 				dc->ctx->dc_bios->fw_info.pll_info.crystal_frequency;

drivers/gpu/drm/amd/display/dmub/dmub_srv.h

@@ -264,9 +264,10 @@ struct dmub_srv_hw_funcs {
 
 	bool (*is_hw_init)(struct dmub_srv *dmub);
 
-	bool (*is_phy_init)(struct dmub_srv *dmub);
+	void (*enable_dmub_boot_options)(struct dmub_srv *dmub);
+
+	union dmub_fw_boot_status (*get_fw_status)(struct dmub_srv *dmub);
 
-	bool (*is_auto_load_done)(struct dmub_srv *dmub);
 
 	void (*set_gpint)(struct dmub_srv *dmub,
 			  union dmub_gpint_data_register reg);

drivers/gpu/drm/amd/display/dmub/src/dmub_dcn20.c

@@ -312,3 +312,18 @@ uint32_t dmub_dcn20_get_gpint_response(struct dmub_srv *dmub)
 {
 	return REG_READ(DMCUB_SCRATCH7);
 }
+
+union dmub_fw_boot_status dmub_dcn20_get_fw_boot_status(struct dmub_srv *dmub)
+{
+	union dmub_fw_boot_status status;
+
+	status.all = REG_READ(DMCUB_SCRATCH0);
+	return status;
+}
+
+void dmub_dcn20_enable_dmub_boot_options(struct dmub_srv *dmub)
+{
+	union dmub_fw_boot_options boot_options = {0};
+
+	REG_WRITE(DMCUB_SCRATCH14, boot_options.all);
+}

drivers/gpu/drm/amd/display/dmub/src/dmub_dcn20.h

@@ -192,4 +192,8 @@ bool dmub_dcn20_is_gpint_acked(struct dmub_srv *dmub,
 
 uint32_t dmub_dcn20_get_gpint_response(struct dmub_srv *dmub);
 
+void dmub_dcn20_enable_dmub_boot_options(struct dmub_srv *dmub);
+
+union dmub_fw_boot_status dmub_dcn20_get_fw_boot_status(struct dmub_srv *dmub);
+
 #endif /* _DMUB_DCN20_H_ */

drivers/gpu/drm/amd/display/dmub/src/dmub_dcn21.c

@@ -51,14 +51,4 @@ const struct dmub_srv_common_regs dmub_srv_dcn21_regs = {
 #undef DMUB_SF
 };
 
-/* Shared functions. */
 
-bool dmub_dcn21_is_auto_load_done(struct dmub_srv *dmub)
-{
-	return (REG_READ(DMCUB_SCRATCH0) == 3);
-}
-
-bool dmub_dcn21_is_phy_init(struct dmub_srv *dmub)
-{
-	return REG_READ(DMCUB_SCRATCH10) == 0;
-}

drivers/gpu/drm/amd/display/dmub/src/dmub_dcn21.h

@@ -32,10 +32,4 @@
 
 extern const struct dmub_srv_common_regs dmub_srv_dcn21_regs;
 
-/* Hardware functions. */
-
-bool dmub_dcn21_is_auto_load_done(struct dmub_srv *dmub);
-
-bool dmub_dcn21_is_phy_init(struct dmub_srv *dmub);
-
 #endif /* _DMUB_DCN21_H_ */

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

@@ -153,18 +153,16 @@ static bool dmub_srv_hw_setup(struct dmub_srv *dmub, enum dmub_asic asic)
 		funcs->set_gpint = dmub_dcn20_set_gpint;
 		funcs->is_gpint_acked = dmub_dcn20_is_gpint_acked;
 		funcs->get_gpint_response = dmub_dcn20_get_gpint_response;
+		funcs->get_fw_status = dmub_dcn20_get_fw_boot_status;
+		funcs->enable_dmub_boot_options = dmub_dcn20_enable_dmub_boot_options;
 
-		if (asic == DMUB_ASIC_DCN21) {
+		if (asic == DMUB_ASIC_DCN21)
 			dmub->regs = &dmub_srv_dcn21_regs;
 
-			funcs->is_auto_load_done = dmub_dcn21_is_auto_load_done;
-			funcs->is_phy_init = dmub_dcn21_is_phy_init;
-		}
 #ifdef CONFIG_DRM_AMD_DC_DCN3_0
 		if (asic == DMUB_ASIC_DCN30) {
 			dmub->regs = &dmub_srv_dcn30_regs;
 
-			funcs->is_auto_load_done = dmub_dcn30_is_auto_load_done;
 			funcs->backdoor_load = dmub_dcn30_backdoor_load;
 			funcs->setup_windows = dmub_dcn30_setup_windows;
 		}
@@ -454,6 +452,10 @@ enum dmub_status dmub_srv_hw_init(struct dmub_srv *dmub,
 		dmub_rb_init(&dmub->inbox1_rb, &rb_params);
 	}
 
+	/* Report to DMUB what features are supported by current driver */
+	if (dmub->hw_funcs.enable_dmub_boot_options)
+		dmub->hw_funcs.enable_dmub_boot_options(dmub);
+
 	if (dmub->hw_funcs.reset_release)
 		dmub->hw_funcs.reset_release(dmub);
 
@@ -514,35 +516,13 @@ enum dmub_status dmub_srv_wait_for_auto_load(struct dmub_srv *dmub,
 	if (!dmub->hw_init)
 		return DMUB_STATUS_INVALID;
 
-	if (!dmub->hw_funcs.is_auto_load_done)
-		return DMUB_STATUS_OK;
-
 	for (i = 0; i <= timeout_us; i += 100) {
-		if (dmub->hw_funcs.is_auto_load_done(dmub))
-			return DMUB_STATUS_OK;
+		union dmub_fw_boot_status status = dmub->hw_funcs.get_fw_status(dmub);
 
-		udelay(100);
-	}
-
-	return DMUB_STATUS_TIMEOUT;
-}
-
-enum dmub_status dmub_srv_wait_for_phy_init(struct dmub_srv *dmub,
-					    uint32_t timeout_us)
-{
-	uint32_t i = 0;
-
-	if (!dmub->hw_init)
-		return DMUB_STATUS_INVALID;
-
-	if (!dmub->hw_funcs.is_phy_init)
-		return DMUB_STATUS_OK;
-
-	for (i = 0; i <= timeout_us; i += 10) {
-		if (dmub->hw_funcs.is_phy_init(dmub))
+		if (status.bits.dal_fw && status.bits.mailbox_rdy)
 			return DMUB_STATUS_OK;
 
-		udelay(10);
+		udelay(100);
 	}
 
 	return DMUB_STATUS_TIMEOUT;