[PATCH 24/33] drm/amd/display: Fix primary EDP link detection

[brichang]

From: Iswara Nagulendran <iswara.nagulendran at amd.com>

[HOW&WHY]
EDP link detection must
be updated to support a primary EDP with a
link index of greater than 0.

* SWDEV-342936 - dc: DSC bringup for SAG 1.5

[WHY]
SmartAccess Graphics 1.5 (a.k.a SmartMux 1.5)
requires seamless switching between GPUs
with DSC enabled.

[HOW]
Moved DSC programming to
apply_single_control_ctx_to_hw before the stream
enablement logic to ensure the CRC checker provides valid
values for non-black frames
allowing the system to come out of forced PSR on
d2i.

Added additional logic to both generate a black
frame through setVisibility calls and keep track
of the CRCs values for this black frame when
coming out of forced PSR.

Updating logic for DalRegKey_DisableDSC to disable
DSC on EDP and all ports for systems.

[CLEANED]
dc: Moved DSC programming to before stream enablement

[HOW&WHY]
Moved DSC programming to
apply_single_control_ctx_to_hw before the stream
enablement logic.

Co-authored-by: sregolui <sregolui at amd.com>
Reviewed-by: Jayendran Ramani <Jayendran.Ramani at amd.com>
Reviewed-by: Harry Vanzylldejong <Harry.Vanzylldejong at amd.com>
Acked-by: Brian Chang <Brian.Chang at amd.com>
Signed-off-by: sregolui <sregolui at amd.com>
Signed-off-by: Iswara Nagulendran <Iswara.Nagulendran at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link.c       | 12 ------------
 .../drm/amd/display/dc/dce110/dce110_hw_sequencer.c | 13 +++++++++++++
 2 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index 74db87f3dc6f..38fa63d43ad9 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -4303,18 +4303,6 @@ void core_link_enable_stream(
 		if (pipe_ctx->stream->dpms_off)
 			return;
 
-		/* Have to setup DSC before DIG FE and BE are connected (which happens before the
-		 * link training). This is to make sure the bandwidth sent to DIG BE won't be
-		 * bigger than what the link and/or DIG BE can handle. VBID[6]/CompressedStream_flag
-		 * will be automatically set at a later time when the video is enabled
-		 * (DP_VID_STREAM_EN = 1).
-		 */
-		if (pipe_ctx->stream->timing.flags.DSC) {
-			if (dc_is_dp_signal(pipe_ctx->stream->signal) ||
-					dc_is_virtual_signal(pipe_ctx->stream->signal))
-				dp_set_dsc_enable(pipe_ctx, true);
-		}
-
 		status = enable_link(state, pipe_ctx);
 
 		if (status != DC_OK) {
diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
index 801206aed63a..fe346e96c2d1 100644
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -1577,6 +1577,19 @@ static enum dc_status apply_single_controller_ctx_to_hw(
 	if (dc_is_dp_signal(pipe_ctx->stream->signal))
 		dp_source_sequence_trace(link, DPCD_SOURCE_SEQ_AFTER_CONNECT_DIG_FE_OTG);
 
+	/* Have to setup DSC before DIG FE and BE are connected (which happens before the
+	 * link training). This is to make sure the bandwidth sent to DIG BE won't be
+	 * bigger than what the link and/or DIG BE can handle. VBID[6]/CompressedStream_flag
+	 * will be automatically set at a later time when the video is enabled
+	 * (DP_VID_STREAM_EN = 1).
+	 */
+	if (pipe_ctx->stream->timing.flags.DSC) {
+		if (dc_is_dp_signal(pipe_ctx->stream->signal) ||
+			dc_is_virtual_signal(pipe_ctx->stream->signal))
+			dp_set_dsc_enable(pipe_ctx, true);
+
+	}
+
 	if (!stream->dpms_off) {
 		if (dc->hwss.update_phy_state)
 			dc->hwss.update_phy_state(context, pipe_ctx, TX_ON_SYMCLK_ON);
-- 
2.25.1