drm/amd/display: Indirect buffer transport for FAMS2 commands

[Why]
The quantity and duration of FAMS2 commands are set to increase
in future products. This necessitates the implementation of a new
mechanism for chaining commands together, allowing all commands
to be processed within a single transaction.

[How]
The indirect buffer acts as a shared buffer on the driver side,
mapped to DMUB's internal CW7 address. Its source address and
size are sent through mailbox command to DMUB, triggering the
transaction.

Reviewed-by: Alvin Lee <[email protected]>
Signed-off-by: Oleh Kuzhylnyi <[email protected]>
Signed-off-by: Wayne Lin <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/dmub/dmub_srv.h b/drivers/gpu/drm/amd/display/dmub/dmub_srv.h
index 3f3fa1b6a69e..211486724e84 100644
--- a/drivers/gpu/drm/amd/display/dmub/dmub_srv.h
+++ b/drivers/gpu/drm/amd/display/dmub/dmub_srv.h
@@ -129,6 +129,7 @@ enum dmub_window_id {
 	DMUB_WINDOW_5_TRACEBUFF,
 	DMUB_WINDOW_6_FW_STATE,
 	DMUB_WINDOW_7_SCRATCH_MEM,
+	DMUB_WINDOW_IB_MEM,
 	DMUB_WINDOW_SHARED_STATE,
 	DMUB_WINDOW_TOTAL,
 };
@@ -539,6 +540,7 @@ struct dmub_srv {
 	uint32_t fw_version;
 	bool is_virtual;
 	struct dmub_fb scratch_mem_fb;
+	struct dmub_fb ib_mem_gart;
 	volatile struct dmub_shared_state_feature_block *shared_state;
 	volatile const struct dmub_fw_state *fw_state;