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

[Why]
If optimized init is done in FW. DCN init can 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>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

4 files changed, 11 insertions, 26 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 105f705bd91a..631c6b10562e 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -4267,9 +4267,6 @@ void dc_set_power_state(
 
 		dc_z10_restore(dc);
 
-		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 &&
diff --git a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
index eef43577508c..d15ec32243e2 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
+++ b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
@@ -179,31 +179,17 @@ bool dc_dmub_srv_cmd_run_list(struct dc_dmub_srv *dc_dmub_srv, unsigned int coun
 	return true;
 }
 
-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;
-
-	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;
+	struct dmub_srv *dmub;
+	union dmub_fw_boot_status status;
 
-		DC_ERROR("DMCUB PHY init failed: status=%d\n", status);
-		ASSERT(0);
+	if (!dc_dmub_srv || !dc_dmub_srv->dmub)
+		return false;
 
-		if (status != DMUB_STATUS_TIMEOUT)
-			/*
-			 * Server likely initialized or we don't have
-			 * DMCUB HW support - this won't end.
-			 */
-			break;
+	dmub = dc_dmub_srv->dmub;
 
-		/* Continue spinning so we don't hang the ASIC. */
-	}
+	return status.bits.optimized_init_done;
 }
 
 bool dc_dmub_srv_notify_stream_mask(struct dc_dmub_srv *dc_dmub_srv,
diff --git a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.h b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.h
index 22f7b2704c8e..a5196a9292b3 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.h
@@ -54,7 +54,7 @@ struct dc_dmub_srv {
 
 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);
 
 bool dc_dmub_srv_cmd_run(struct dc_dmub_srv *dc_dmub_srv, union dmub_rb_cmd *cmd, enum dm_dmub_wait_type wait_type);
 
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
index 1c3b6f25a782..a7ad1d7bc43e 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -1524,7 +1524,9 @@ 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 =