[PATCH] drm/amd: Revert "drm/amd/display: keep eDP Vdd on when eDP stream is already enabled"

[Mario Limonciello]

A variety of Lenovo machines with Rembrandt APUs and OLED panels have
stopped showing the display at login.  This behavior clears up after
leaving it idle and moving the mouse or touching keyboard.

It was bisected to be caused by commit 559e2655220d ("drm/amd/display:
keep eDP Vdd on when eDP stream is already enabled").  Revert this commit
to fix the issue.

Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2047
Reported-by: Aaron Ma <aaron.ma at canonical.com>
Fixes: 559e2655220d ("drm/amd/display: keep eDP Vdd on when eDP stream is already enabled")
Signed-off-by: Mario Limonciello <mario.limonciello at amd.com>
---
 .../display/dc/dce110/dce110_hw_sequencer.c   | 24 ++-----------------
 1 file changed, 2 insertions(+), 22 deletions(-)

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 7eff7811769d..5f2afa5b4814 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
@@ -1766,29 +1766,9 @@ void dce110_enable_accelerated_mode(struct dc *dc, struct dc_state *context)
 				break;
 			}
 		}
-
-		/*
-		 * TO-DO: So far the code logic below only addresses single eDP case.
-		 * For dual eDP case, there are a few things that need to be
-		 * implemented first:
-		 *
-		 * 1. Change the fastboot logic above, so eDP link[0 or 1]'s
-		 * stream[0 or 1] will all be checked.
-		 *
-		 * 2. Change keep_edp_vdd_on to an array, and maintain keep_edp_vdd_on
-		 * for each eDP.
-		 *
-		 * Once above 2 things are completed, we can then change the logic below
-		 * correspondingly, so dual eDP case will be fully covered.
-		 */
-
-		// We are trying to enable eDP, don't power down VDD if eDP stream is existing
-		if ((edp_stream_num == 1 && edp_streams[0] != NULL) || can_apply_edp_fast_boot) {
+		// We are trying to enable eDP, don't power down VDD
+		if (can_apply_edp_fast_boot)
 			keep_edp_vdd_on = true;
-			DC_LOG_EVENT_LINK_TRAINING("Keep eDP Vdd on\n");
-		} else {
-			DC_LOG_EVENT_LINK_TRAINING("No eDP stream enabled, turn eDP Vdd off\n");
-		}
 	}
 
 	// Check seamless boot support
-- 
2.34.1