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From:   Kuogee Hsieh <quic_khsieh@quicinc.com>
To:     <dri-devel@lists.freedesktop.org>, <robdclark@gmail.com>,
        <sean@poorly.run>, <swboyd@chromium.org>, <dianders@chromium.org>,
        <vkoul@kernel.org>, <daniel@ffwll.ch>, <airlied@gmail.com>,
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        <andersson@kernel.org>
CC:     Kuogee Hsieh <quic_khsieh@quicinc.com>,
        <quic_abhinavk@quicinc.com>, <quic_jesszhan@quicinc.com>,
        <quic_sbillaka@quicinc.com>, <marijn.suijten@somainline.org>,
        <freedreno@lists.freedesktop.org>, <linux-arm-msm@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
Subject: [PATCH v3 6/7] drm/msm/dp: add pm_runtime_force_suspend()/resume()
Date:   Fri, 15 Sep 2023 14:38:20 -0700
Message-ID: <1694813901-26952-7-git-send-email-quic_khsieh@quicinc.com>
In-Reply-To: <1694813901-26952-1-git-send-email-quic_khsieh@quicinc.com>
References: <1694813901-26952-1-git-send-email-quic_khsieh@quicinc.com>
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Add pm_runtime_force_suspend()/resume() to complete incorporating pm
runtime framework into DP driver. Both dp_pm_prepare() and dp_pm_complete()
are added to set hpd_state to correct state. After resume, DP driver will
re training its main link after .hpd_enable() callback enabled HPD
interrupts and bring up display accordingly.

Changes in v3:
-- replace dp_pm_suspend() with pm_runtime_force_suspend()
-- replace dp_pm_resume() with pm_runtime_force_resume()

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 87 +++++--------------------------------
 1 file changed, 10 insertions(+), 77 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index b6992202..b58cb02 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1333,101 +1333,35 @@ static int dp_pm_runtime_resume(struct device *dev)
 	return 0;
 }
 
-static int dp_pm_resume(struct device *dev)
+static void dp_pm_complete(struct device *dev)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct msm_dp *dp_display = platform_get_drvdata(pdev);
-	struct dp_display_private *dp;
-	int sink_count = 0;
-
-	dp = container_of(dp_display, struct dp_display_private, dp_display);
+	struct dp_display_private *dp = dev_get_dp_display_private(dev);
 
 	mutex_lock(&dp->event_mutex);
 
 	drm_dbg_dp(dp->drm_dev,
-		"Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
+		"type=%d core_inited=%d phy_inited=%d power_on=%d\n",
 		dp->dp_display.connector_type, dp->core_initialized,
-		dp->phy_initialized, dp_display->power_on);
+		dp->phy_initialized, dp->dp_display.power_on);
 
 	/* start from disconnected state */
 	dp->hpd_state = ST_DISCONNECTED;
 
-	/* turn on dp ctrl/phy */
-	dp_display_host_init(dp);
-
-	if (dp_display->is_edp)
-		dp_catalog_ctrl_hpd_enable(dp->catalog);
-
-	if (dp_catalog_link_is_connected(dp->catalog)) {
-		/*
-		 * set sink to normal operation mode -- D0
-		 * before dpcd read
-		 */
-		dp_display_host_phy_init(dp);
-		dp_link_psm_config(dp->link, &dp->panel->link_info, false);
-		sink_count = drm_dp_read_sink_count(dp->aux);
-		if (sink_count < 0)
-			sink_count = 0;
-
-		dp_display_host_phy_exit(dp);
-	}
-
-	dp->link->sink_count = sink_count;
-	/*
-	 * can not declared display is connected unless
-	 * HDMI cable is plugged in and sink_count of
-	 * dongle become 1
-	 * also only signal audio when disconnected
-	 */
-	if (dp->link->sink_count) {
-		dp->dp_display.link_ready = true;
-	} else {
-		dp->dp_display.link_ready = false;
-		dp_display_handle_plugged_change(dp_display, false);
-	}
-
-	drm_dbg_dp(dp->drm_dev,
-		"After, type=%d sink=%d conn=%d core_init=%d phy_init=%d power=%d\n",
-		dp->dp_display.connector_type, dp->link->sink_count,
-		dp->dp_display.link_ready, dp->core_initialized,
-		dp->phy_initialized, dp_display->power_on);
-
 	mutex_unlock(&dp->event_mutex);
-
-	return 0;
 }
 
-static int dp_pm_suspend(struct device *dev)
+static int dp_pm_prepare(struct device *dev)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct msm_dp *dp_display = platform_get_drvdata(pdev);
-	struct dp_display_private *dp;
-
-	dp = container_of(dp_display, struct dp_display_private, dp_display);
+	struct dp_display_private *dp = dev_get_dp_display_private(dev);
 
 	mutex_lock(&dp->event_mutex);
 
-	drm_dbg_dp(dp->drm_dev,
-		"Before, type=%d core_inited=%d  phy_inited=%d power_on=%d\n",
-		dp->dp_display.connector_type, dp->core_initialized,
-		dp->phy_initialized, dp_display->power_on);
-
 	/* mainlink enabled */
 	if (dp_power_clk_status(dp->power, DP_CTRL_PM))
 		dp_ctrl_off_link_stream(dp->ctrl);
 
-	dp_display_host_phy_exit(dp);
-
-	/* host_init will be called at pm_resume */
-	dp_display_host_deinit(dp);
-
 	dp->hpd_state = ST_SUSPENDED;
 
-	drm_dbg_dp(dp->drm_dev,
-		"After, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
-		dp->dp_display.connector_type, dp->core_initialized,
-		dp->phy_initialized, dp_display->power_on);
-
 	mutex_unlock(&dp->event_mutex);
 
 	return 0;
@@ -1435,8 +1369,10 @@ static int dp_pm_suspend(struct device *dev)
 
 static const struct dev_pm_ops dp_pm_ops = {
 	SET_RUNTIME_PM_OPS(dp_pm_runtime_suspend, dp_pm_runtime_resume, NULL)
-	.suspend = dp_pm_suspend,
-	.resume =  dp_pm_resume,
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+                                pm_runtime_force_resume)
+	.prepare = dp_pm_prepare,
+	.complete = dp_pm_complete,
 };
 
 static struct platform_driver dp_display_driver = {
@@ -1670,9 +1606,6 @@ void dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
 
 	dp_display = container_of(dp, struct dp_display_private, dp_display);
 
-	if (dp->is_edp)
-		dp_hpd_unplug_handle(dp_display, 0);
-
 	mutex_lock(&dp_display->event_mutex);
 
 	state = dp_display->hpd_state;
-- 
2.7.4