Revert "drm/amd/display: Improve DisplayPort monitor interop"

This reverts commit 1adb2ff1f6b170cdbc3925a359c8f39d2215dc20.

This breaks display wake up in stable kernels (5.7.x and 5.8.x).

Note that there is no upstream equivalent to this
revert. This patch was targeted for stable by Sasha's stable
patch process. Presumably there are some other changes necessary
for this patch to work properly on stable kernels.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1266
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 5.7.x, 5.8.x
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 8 insertions, 23 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 232cd690e30a..31aa31c280ee 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -3297,11 +3297,9 @@ void core_link_disable_stream(struct pipe_ctx *pipe_ctx)
 			write_i2c_redriver_setting(pipe_ctx, false);
 		}
 	}
-
-	disable_link(pipe_ctx->stream->link, pipe_ctx->stream->signal);
-
 	dc->hwss.disable_stream(pipe_ctx);
 
+	disable_link(pipe_ctx->stream->link, pipe_ctx->stream->signal);
 	if (pipe_ctx->stream->timing.flags.DSC) {
 		if (dc_is_dp_signal(pipe_ctx->stream->signal))
 			dp_set_dsc_enable(pipe_ctx, false);
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index 6124af571bff..91cd884d6f25 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -1102,10 +1102,6 @@ static inline enum link_training_result perform_link_training_int(
 	dpcd_pattern.v1_4.TRAINING_PATTERN_SET = DPCD_TRAINING_PATTERN_VIDEOIDLE;
 	dpcd_set_training_pattern(link, dpcd_pattern);
 
-	/* delay 5ms after notifying sink of idle pattern before switching output */
-	if (link->connector_signal != SIGNAL_TYPE_EDP)
-		msleep(5);
-
 	/* 4. mainlink output idle pattern*/
 	dp_set_hw_test_pattern(link, DP_TEST_PATTERN_VIDEO_MODE, NULL, 0);
 
@@ -1555,12 +1551,6 @@ bool perform_link_training_with_retries(
 	struct dc_link *link = stream->link;
 	enum dp_panel_mode panel_mode = dp_get_panel_mode(link);
 
-	/* We need to do this before the link training to ensure the idle pattern in SST
-	 * mode will be sent right after the link training
-	 */
-	link->link_enc->funcs->connect_dig_be_to_fe(link->link_enc,
-							pipe_ctx->stream_res.stream_enc->id, true);
-
 	for (j = 0; j < attempts; ++j) {
 
 		dp_enable_link_phy(
@@ -1577,6 +1567,12 @@ bool perform_link_training_with_retries(
 
 		dp_set_panel_mode(link, panel_mode);
 
+		/* We need to do this before the link training to ensure the idle pattern in SST
+		 * mode will be sent right after the link training
+		 */
+		link->link_enc->funcs->connect_dig_be_to_fe(link->link_enc,
+								pipe_ctx->stream_res.stream_enc->id, true);
+
 		if (link->aux_access_disabled) {
 			dc_link_dp_perform_link_training_skip_aux(link, link_setting);
 			return true;
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 2af1d74d16ad..b77e9dc16086 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
@@ -1069,17 +1069,8 @@ void dce110_blank_stream(struct pipe_ctx *pipe_ctx)
 		link->dc->hwss.set_abm_immediate_disable(pipe_ctx);
 	}
 
-	if (dc_is_dp_signal(pipe_ctx->stream->signal)) {
+	if (dc_is_dp_signal(pipe_ctx->stream->signal))
 		pipe_ctx->stream_res.stream_enc->funcs->dp_blank(pipe_ctx->stream_res.stream_enc);
-
-		/*
-		 * After output is idle pattern some sinks need time to recognize the stream
-		 * has changed or they enter protection state and hang.
-		 */
-		if (!dc_is_embedded_signal(pipe_ctx->stream->signal))
-			msleep(60);
-	}
-
 }