drm/amd/display: Remove unnecessary eDP power down

[why]
When first time of link training is fail,
eDP would be powered down and
would not be powered up for next retry link training.
It causes that all of retry link linking would be fail.

[how]
We has extracted both power up and down sequence from
enable/disable link output function before DCN32.
We remov eDP power down in dcn32_disable_link_output().

Reviewed-by: Charlene Liu <charlene.liu@amd.com>
Signed-off-by: Yiling Chen <yi-ling.chen2@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit f5860c88cdfe7300d08c1aef881bba0cac369e34)

diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c b/drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c
index fa11f075d1f9aaeb51889eb7d9e48d70b6291868..d9136d252ee14acbf79a5fca5379e267fed3c31f 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c
@@ -1398,12 +1398,12 @@ void dcn32_disable_link_output(struct dc_link *link,
 
        link_hwss->disable_link_output(link, link_res, signal);
        link->phy_state.symclk_state = SYMCLK_OFF_TX_OFF;
-
-       if (signal == SIGNAL_TYPE_EDP &&
-                       link->dc->hwss.edp_power_control &&
-                       !link->skip_implict_edp_power_control)
-               link->dc->hwss.edp_power_control(link, false);
-       else if (dmcu != NULL && dmcu->funcs->unlock_phy)
+       /*
+        * Add the logic to extract BOTH power up and power down sequences
+        * from enable/disable link output and only call edp panel control
+        * in enable_link_dp and disable_link_dp once.
+        */
+       if (dmcu != NULL && dmcu->funcs->unlock_phy)
                dmcu->funcs->unlock_phy(dmcu);
 
        dc->link_srv->dp_trace_source_sequence(link, DPCD_SOURCE_SEQ_AFTER_DISABLE_LINK_PHY);