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>

1 files changed, 8 insertions, 20 deletions

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 eea2429ac67d..96532f7ba480 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
+++ b/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;
 }