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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>,
        <agross@kernel.org>, <dmitry.baryshkov@linaro.org>,
        <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 v1 5/5] drm/msm/dp: move of_dp_aux_populate_bus() to probe for eDP
Date:   Fri, 7 Jul 2023 16:52:23 -0700
Message-ID: <1688773943-3887-6-git-send-email-quic_khsieh@quicinc.com>
In-Reply-To: <1688773943-3887-1-git-send-email-quic_khsieh@quicinc.com>
References: <1688773943-3887-1-git-send-email-quic_khsieh@quicinc.com>
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Move of_dp_aux_populate_bus() to dp_display_probe() for eDP
from dp_display_bind() so that probe deferral cases can be
handled effectively

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
---
 drivers/gpu/drm/msm/dp/dp_aux.c     | 25 ++++++++++++
 drivers/gpu/drm/msm/dp/dp_display.c | 79 +++++++++++++++++++------------------
 2 files changed, 65 insertions(+), 39 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_aux.c b/drivers/gpu/drm/msm/dp/dp_aux.c
index c592064..c1baffb 100644
--- a/drivers/gpu/drm/msm/dp/dp_aux.c
+++ b/drivers/gpu/drm/msm/dp/dp_aux.c
@@ -505,6 +505,21 @@ void dp_aux_unregister(struct drm_dp_aux *dp_aux)
 	drm_dp_aux_unregister(dp_aux);
 }
 
+static int dp_wait_hpd_asserted(struct drm_dp_aux *dp_aux,
+				 unsigned long wait_us)
+{
+	int ret;
+	struct dp_aux_private *aux;
+
+	aux = container_of(dp_aux, struct dp_aux_private, dp_aux);
+
+	pm_runtime_get_sync(aux->dev);
+	ret = dp_catalog_aux_wait_for_hpd_connect_state(aux->catalog);
+	pm_runtime_put_sync(aux->dev);
+
+	return ret;
+}
+
 struct drm_dp_aux *dp_aux_get(struct device *dev, struct dp_catalog *catalog,
 			      bool is_edp)
 {
@@ -528,6 +543,16 @@ struct drm_dp_aux *dp_aux_get(struct device *dev, struct dp_catalog *catalog,
 	aux->catalog = catalog;
 	aux->retry_cnt = 0;
 
+	/*
+	 * Use the drm_dp_aux_init() to use the aux adapter
+	 * before registering aux with the DRM device.
+	 */
+	aux->dp_aux.name = "dpu_dp_aux";
+	aux->dp_aux.dev = dev;
+	aux->dp_aux.transfer = dp_aux_transfer;
+	aux->dp_aux.wait_hpd_asserted = dp_wait_hpd_asserted;
+	drm_dp_aux_init(&aux->dp_aux);
+
 	return &aux->dp_aux;
 }
 
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 185f1eb..7ed4bea 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -302,10 +302,6 @@ static int dp_display_bind(struct device *dev, struct device *master,
 		goto end;
 	}
 
-	pm_runtime_enable(dev);
-	pm_runtime_set_autosuspend_delay(dev, 1000);
-	pm_runtime_use_autosuspend(dev);
-
 	return 0;
 end:
 	return rc;
@@ -322,8 +318,6 @@ static void dp_display_unbind(struct device *dev, struct device *master,
 
 	kthread_stop(dp->ev_tsk);
 
-	of_dp_aux_depopulate_bus(dp->aux);
-
 	dp_power_client_deinit(dp->power);
 	dp_unregister_audio_driver(dev, dp->audio);
 	dp_aux_unregister(dp->aux);
@@ -1245,6 +1239,29 @@ static const struct msm_dp_desc *dp_display_get_desc(struct platform_device *pde
 	return NULL;
 }
 
+static void of_dp_aux_depopulate_bus_void(void *data)
+{
+	of_dp_aux_depopulate_bus(data);
+}
+
+static int dp_display_auxbus_emulation(struct dp_display_private *dp)
+{
+	struct device *dev = &dp->pdev->dev;
+	struct device_node *aux_bus;
+	int ret = 0;
+
+	aux_bus = of_get_child_by_name(dev->of_node, "aux-bus");
+
+	if (aux_bus) {
+		ret = devm_of_dp_aux_populate_bus(dp->aux, NULL);
+
+		devm_add_action_or_reset(dev, of_dp_aux_depopulate_bus_void,
+					 dp->aux);
+	}
+
+	return ret;
+}
+
 static int dp_display_probe(struct platform_device *pdev)
 {
 	int rc = 0;
@@ -1290,8 +1307,18 @@ static int dp_display_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, &dp->dp_display);
 
+	pm_runtime_enable(&pdev->dev);
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
+	pm_runtime_use_autosuspend(&pdev->dev);
+
 	dp_display_request_irq(dp);
 
+	if (dp->dp_display.is_edp) {
+		rc = dp_display_auxbus_emulation(dp);
+		if (rc)
+			DRM_ERROR("eDP aux-bus emulation failed, rc=%d\n", rc);
+	}
+
 	rc = component_add(&pdev->dev, &dp_display_comp_ops);
 	if (rc) {
 		DRM_ERROR("component add failed, rc=%d\n", rc);
@@ -1306,11 +1333,14 @@ static int dp_display_remove(struct platform_device *pdev)
 	struct dp_display_private *dp = dev_get_dp_display_private(&pdev->dev);
 
 	component_del(&pdev->dev, &dp_display_comp_ops);
-	dp_display_deinit_sub_modules(dp);
-
 	platform_set_drvdata(pdev, NULL);
+
+	pm_runtime_dont_use_autosuspend(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
 	pm_runtime_put_sync_suspend(&pdev->dev);
 
+	dp_display_deinit_sub_modules(dp);
+
 	return 0;
 }
 
@@ -1514,31 +1544,10 @@ void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor)
 
 static int dp_display_get_next_bridge(struct msm_dp *dp)
 {
-	int rc;
+	int rc = 0;
 	struct dp_display_private *dp_priv;
-	struct device_node *aux_bus;
-	struct device *dev;
 
 	dp_priv = container_of(dp, struct dp_display_private, dp_display);
-	dev = &dp_priv->pdev->dev;
-	aux_bus = of_get_child_by_name(dev->of_node, "aux-bus");
-
-	if (aux_bus && dp->is_edp) {
-		/*
-		 * The code below assumes that the panel will finish probing
-		 * by the time devm_of_dp_aux_populate_ep_devices() returns.
-		 * This isn't a great assumption since it will fail if the
-		 * panel driver is probed asynchronously but is the best we
-		 * can do without a bigger driver reorganization.
-		 */
-		rc = of_dp_aux_populate_bus(dp_priv->aux, NULL);
-		of_node_put(aux_bus);
-		if (rc)
-			goto error;
-	} else if (dp->is_edp) {
-		DRM_ERROR("eDP aux_bus not found\n");
-		return -ENODEV;
-	}
 
 	/*
 	 * External bridges are mandatory for eDP interfaces: one has to
@@ -1551,17 +1560,9 @@ static int dp_display_get_next_bridge(struct msm_dp *dp)
 	if (!dp->is_edp && rc == -ENODEV)
 		return 0;
 
-	if (!rc) {
+	if (!rc)
 		dp->next_bridge = dp_priv->parser->next_bridge;
-		return 0;
-	}
 
-error:
-	if (dp->is_edp) {
-		of_dp_aux_depopulate_bus(dp_priv->aux);
-		dp_display_host_phy_exit(dp_priv);
-		dp_display_host_deinit(dp_priv);
-	}
 	return rc;
 }
 
-- 
2.7.4