[PATCH 34/66] drm/amd/display: Improvement for handling edp link training fails

[Qingqing Zhuo]

From: Jingwen Zhu <jingwen....@amd.com>

[Why]
The eDP retrain will cause the DPCD 300 to be reset to default.
And cause the brightness can't be set correctly.

[How]
delete the call to edp panel power control in both
enable_link_output/disable_link_output entirely and
only call edp panel control in enable_link_dp and 
disable_link_dp once.

Reviewed-by: Charlene Liu <charlene....@amd.com>
Acked-by: Qingqing Zhuo <qingqing.z...@amd.com>
Signed-off-by: Jingwen Zhu <jingwen....@amd.com>
---
 .../display/dc/dce110/dce110_hw_sequencer.c   | 19 +++++++++++--------
 .../gpu/drm/amd/display/dc/link/link_dpms.c   |  5 +++++
 2 files changed, 16 insertions(+), 8 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 9fe0ce91db00..8d2460d06bce 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
@@ -3031,10 +3031,12 @@ void dce110_enable_dp_link_output(
        const struct link_hwss *link_hwss = get_link_hwss(link, link_res);
        unsigned int i;
 
-
+       /*
+        * 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 (link->connector_signal == SIGNAL_TYPE_EDP) {
-               if (!link->dc->config.edp_no_power_sequencing)
-                       link->dc->hwss.edp_power_control(link, true);
                link->dc->hwss.edp_wait_for_hpd_ready(link, true);
        }
 
@@ -3096,11 +3098,12 @@ void dce110_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_backlight_control)
-               link->dc->hwss.edp_power_control(link, false);
-       else if (dmcu != NULL && dmcu->funcs->lock_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->lock_phy)
                dmcu->funcs->unlock_phy(dmcu);
        dc->link_srv->dp_trace_source_sequence(link, 
DPCD_SOURCE_SEQ_AFTER_DISABLE_LINK_PHY);
 }
diff --git a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c 
b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c
index 027ad1f0144d..2267fb097830 100644
--- a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c
+++ b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c
@@ -1927,6 +1927,11 @@ static void disable_link_dp(struct dc_link *link,
 
        dp_disable_link_phy(link, link_res, signal);
 
+       if (link->connector_signal == SIGNAL_TYPE_EDP) {
+               if (!link->dc->config.edp_no_power_sequencing)
+                       link->dc->hwss.edp_power_control(link, false);
+       }
+
        if (signal == SIGNAL_TYPE_DISPLAY_PORT_MST)
                /* set the sink to SST mode after disabling the link */
                enable_mst_on_sink(link, false);
-- 
2.34.1