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, 29 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h
index 55139d7bf422..cfaa39c5dd16 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h
@@ -1117,6 +1117,11 @@ struct edp_psr_info {
 	uint8_t force_psrsu_cap;
 };
 
+struct replay_info {
+	uint8_t pixel_deviation_per_line;
+	uint8_t max_deviation_line;
+};
+
 struct dprx_states {
 	bool cable_id_written;
 };
@@ -1236,6 +1241,8 @@ struct dpcd_caps {
 	uint8_t edp_rev;
 	union edp_alpm_caps alpm_caps;
 	struct edp_psr_info psr_info;
+
+	struct replay_info pr_info;
 };
 
 union dpcd_sink_ext_caps {
@@ -1276,6 +1283,28 @@ union dpcd_psr_configuration {
 	unsigned char raw;
 };
 
+union replay_enable_and_configuration {
+	struct {
+		unsigned char FREESYNC_PANEL_REPLAY_MODE              :1;
+		unsigned char TIMING_DESYNC_ERROR_VERIFICATION        :1;
+		unsigned char STATE_TRANSITION_ERROR_DETECTION        :1;
+		unsigned char RESERVED0                               :1;
+		unsigned char RESERVED1                               :4;
+	} bits;
+	unsigned char raw;
+};
+
+union dpcd_replay_configuration {
+	struct {
+		unsigned char STATE_TRANSITION_ERROR_STATUS    : 1;
+		unsigned char DESYNC_ERROR_STATUS              : 1;
+		unsigned char SINK_DEVICE_REPLAY_STATUS        : 3;
+		unsigned char SINK_FRAME_LOCKED                : 2;
+		unsigned char RESERVED                         : 1;
+	} bits;
+	unsigned char raw;
+};
+
 union dpcd_alpm_configuration {
 	struct {
 		unsigned char ENABLE                    : 1;