[PATCH] drm/msm/dp: power off DP phy base on mainlink status at suspend

[Kuogee Hsieh <khsieh@codeaurora.org>]

DP mainlink can be either enabled or disabled at the time of suspend
happen. Therefore DP phy teared down at suspend should base on mainlink
status at that instance.

Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
---
 drivers/gpu/drm/msm/dp/dp_ctrl.c    | 5 ++++-
 drivers/gpu/drm/msm/dp/dp_ctrl.h    | 2 +-
 drivers/gpu/drm/msm/dp/dp_display.c | 9 ++++++++-
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index dbd8943..5115c05 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
@@ -1398,7 +1398,7 @@ int dp_ctrl_host_init(struct dp_ctrl *dp_ctrl, bool flip, bool reset)
  * Perform required steps to uninitialize DP controller
  * and its resources.
  */
-void dp_ctrl_host_deinit(struct dp_ctrl *dp_ctrl)
+void dp_ctrl_host_deinit(struct dp_ctrl *dp_ctrl, bool mainlink_on)
 {
 	struct dp_ctrl_private *ctrl;
 	struct dp_io *dp_io;
@@ -1414,6 +1414,9 @@ void dp_ctrl_host_deinit(struct dp_ctrl *dp_ctrl)
 	phy = dp_io->phy;
 
 	dp_catalog_ctrl_enable_irq(ctrl->catalog, false);
+	if (mainlink_on)
+		phy_power_off(phy);
+
 	phy_exit(phy);
 
 	DRM_DEBUG_DP("Host deinitialized successfully\n");
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.h b/drivers/gpu/drm/msm/dp/dp_ctrl.h
index 25e4f75..a23ee2b 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.h
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.h
@@ -20,7 +20,7 @@ struct dp_ctrl {
 };
 
 int dp_ctrl_host_init(struct dp_ctrl *dp_ctrl, bool flip, bool reset);
-void dp_ctrl_host_deinit(struct dp_ctrl *dp_ctrl);
+void dp_ctrl_host_deinit(struct dp_ctrl *dp_ctrl, bool mainlink_on);
 int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl);
 int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl);
 int dp_ctrl_off_link_stream(struct dp_ctrl *dp_ctrl);
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index cdec0a3..88eeeb5 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -104,6 +104,8 @@ struct dp_display_private {
 
 	bool encoder_mode_set;
 
+	bool mainlink_on;
+
 	/* wait for audio signaling */
 	struct completion audio_comp;
 
@@ -353,11 +355,14 @@ static int dp_display_process_hpd_high(struct dp_display_private *dp)
 	dp_link_psm_config(dp->link, &dp->panel->link_info, false);
 
 	dp_link_reset_phy_params_vx_px(dp->link);
+
+	dp->mainlink_on = false;
 	rc = dp_ctrl_on_link(dp->ctrl);
 	if (rc) {
 		DRM_ERROR("failed to complete DP link training\n");
 		goto end;
 	}
+	dp->mainlink_on = true;
 
 	dp_add_event(dp, EV_USER_NOTIFICATION, true, 0);
 
@@ -392,7 +397,7 @@ static void dp_display_host_deinit(struct dp_display_private *dp)
 		return;
 	}
 
-	dp_ctrl_host_deinit(dp->ctrl);
+	dp_ctrl_host_deinit(dp->ctrl, dp->mainlink_on);
 	dp_aux_deinit(dp->aux);
 	dp_power_deinit(dp->power);
 
@@ -941,6 +946,8 @@ static int dp_display_disable(struct dp_display_private *dp, u32 data)
 		dp->core_initialized = false;
 	}
 
+	dp->mainlink_on = false;
+
 	dp_display->power_on = false;
 
 	return 0;
-- 
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