drm/amd/display: Add structs for Freesync Panel Replay

In some instances, the GPU is transmitting repeated frame to the sink
without any updates or changes in the content. These repeat transmission
are wasteful, resulting in power draw in different aspects of the system

1. DCN is fetching the frame of data from DF/UMC/DRAM. This memory traffic
prevents power down of parts of this HW path.

2. GPU is transmitting pixel data to the display through the main link of
the DisplayPort interface. This prevents power down of both the Source
transmitter (TX) and the Sink receiver (RX)

The concepts of utilizing replay is similar to PSR, but there is a benefit of:
	Source and Sink remaining synchronized which allows for
        	- lower latency when switching from replay to live frames
	        - enable the possibility of more use cases
		- easy control of the sink's refresh rate during replay

Due to Source and Sink remaining timing synchronized, Replay can be activated
in more UI scenarios.

Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/inc/core_types.h b/drivers/gpu/drm/amd/display/dc/inc/core_types.h
index 034610b74a37..bc0c26a5f228 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/core_types.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/core_types.h
@@ -304,6 +304,8 @@ struct resource_pool {
 	struct dmcu *dmcu;
 	struct dmub_psr *psr;
 
+	struct dmub_replay *replay;
+
 	struct abm *multiple_abms[MAX_PIPES];
 
 	const struct resource_funcs *funcs;
@@ -572,6 +574,23 @@ struct dc_state {
 	} perf_params;
 };
 
+struct replay_context {
+	/* ddc line */
+	enum channel_id aux_inst;
+	/* Transmitter id */
+	enum transmitter digbe_inst;
+	/* Engine Id is used for Dig Be source select */
+	enum engine_id digfe_inst;
+	/* Controller Id used for Dig Fe source select */
+	enum controller_id controllerId;
+	unsigned int line_time_in_ns;
+};
+
+enum dc_replay_enable {
+	DC_REPLAY_DISABLE			= 0,
+	DC_REPLAY_ENABLE			= 1,
+};
+
 struct dc_bounding_box_max_clk {
 	int max_dcfclk_mhz;
 	int max_dispclk_mhz;