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

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Date:   Wed, 26 May 2021 11:08:23 -0700
From:   Kuogee Hsieh <khsieh@...eaurora.org>
To:     robdclark@...il.com, sean@...rly.run, swboyd@...omium.org,
        vkoul@...nel.org, agross@...nel.org, bjorn.andersson@...aro.org
Cc:     abhinavk@...eaurora.org, aravindh@...eaurora.org,
        khsieh@...eaurora.org, freedreno@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/msm/dp: power off DP phy base on mainlink status at suspend

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@...eaurora.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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