[PATCH v3 0/2] drm/msm: Fix dsi/bridge probe

[PATCH v3 0/2] drm/msm: Fix dsi/bridge probe

[AngeloGioacchino Del Regno]

Context, from patch 2/2:
Since commit 8f59ee9a570c ("drm/msm/dsi: Adjust probe order"), the
DSI host gets initialized earlier, but this caused unability to probe
the entire stack of components because they all depend on interrupts
coming from the main `mdss` node (mdp5, or dpu1).

Changes in v3:
- Removed a forgotten (and wrong) kfree() call.

Series v2:
After a very nice conversation with Dmitry, it turned out that my first
approach to solve this issue wasn't great: even though it appeared to
actually work, it was introducing a number of issues, one of which was
critical as it was not removing down the DRM device when it's supposed to.

Instead of actually fixing that patch, I went for "simplifying" the
approach by not initializing the entire MDSS, but just the interrupt
controller, which still untangles the infinite probe deferrals, but
actually doesn't even touch most of the already present logic in place.


AngeloGioacchino Del Regno (2):
  drm/msm: Allocate msm_drm_private early and pass it as driver data
  drm/msm: Initialize MDSS irq domain at probe time

 drivers/gpu/drm/msm/adreno/adreno_device.c | 16 ++---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c    |  4 +-
 drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c   | 50 ++++++++++------
 drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c   |  3 +-
 drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c  | 58 ++++++++++++------
 drivers/gpu/drm/msm/dp/dp_display.c        | 10 +---
 drivers/gpu/drm/msm/dsi/dsi.c              |  6 +-
 drivers/gpu/drm/msm/edp/edp.c              |  6 +-
 drivers/gpu/drm/msm/hdmi/hdmi.c            |  7 +--
 drivers/gpu/drm/msm/msm_drv.c              | 68 +++++++++++++---------
 drivers/gpu/drm/msm/msm_kms.h              |  3 +
 11 files changed, 133 insertions(+), 98 deletions(-)

-- 
2.33.1

[PATCH v3 0/2] drm/msm: Fix dsi/bridge probe

[AngeloGioacchino Del Regno]

Context, from patch 2/2:
Since commit 8f59ee9a570c ("drm/msm/dsi: Adjust probe order"), the
DSI host gets initialized earlier, but this caused unability to probe
the entire stack of components because they all depend on interrupts
coming from the main `mdss` node (mdp5, or dpu1).

Changes in v3:
- Removed a forgotten (and wrong) kfree() call.

Series v2:
After a very nice conversation with Dmitry, it turned out that my first
approach to solve this issue wasn't great: even though it appeared to
actually work, it was introducing a number of issues, one of which was
critical as it was not removing down the DRM device when it's supposed to.

Instead of actually fixing that patch, I went for "simplifying" the
approach by not initializing the entire MDSS, but just the interrupt
controller, which still untangles the infinite probe deferrals, but
actually doesn't even touch most of the already present logic in place.


AngeloGioacchino Del Regno (2):
  drm/msm: Allocate msm_drm_private early and pass it as driver data
  drm/msm: Initialize MDSS irq domain at probe time

 drivers/gpu/drm/msm/adreno/adreno_device.c | 16 ++---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c    |  4 +-
 drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c   | 50 ++++++++++------
 drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c   |  3 +-
 drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c  | 58 ++++++++++++------
 drivers/gpu/drm/msm/dp/dp_display.c        | 10 +---
 drivers/gpu/drm/msm/dsi/dsi.c              |  6 +-
 drivers/gpu/drm/msm/edp/edp.c              |  6 +-
 drivers/gpu/drm/msm/hdmi/hdmi.c            |  7 +--
 drivers/gpu/drm/msm/msm_drv.c              | 68 +++++++++++++---------
 drivers/gpu/drm/msm/msm_kms.h              |  3 +
 11 files changed, 133 insertions(+), 98 deletions(-)

-- 
2.33.1

[PATCH v3 1/2] drm/msm: Allocate msm_drm_private early and pass it as driver data

[AngeloGioacchino Del Regno]

In preparation for registering the mdss interrupt controller earlier,
move the allocation of msm_drm_private from component bind time to
msm_drv probe; this also allows us to use the devm variant of kzalloc.

Since it is not right to allocate the drm_device at probe time (as
it should exist only when all components are bound, and taken down
when components get cleaned up), the only way to make this happen is
to pass a pointer to msm_drm_private as driver data (like done in
many other DRM drivers), instead of one to drm_device like it's
currently done in this driver.

This is also simplifying some bind/unbind functions around drm/msm,
as some of them are using drm_device just to grab a pointer to the
msm_drm_private structure, which we now retrieve in one call.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/gpu/drm/msm/adreno/adreno_device.c | 16 +++-----
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c    |  4 +-
 drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c   |  3 +-
 drivers/gpu/drm/msm/dp/dp_display.c        | 10 ++---
 drivers/gpu/drm/msm/dsi/dsi.c              |  6 +--
 drivers/gpu/drm/msm/edp/edp.c              |  6 +--
 drivers/gpu/drm/msm/hdmi/hdmi.c            |  7 ++--
 drivers/gpu/drm/msm/msm_drv.c              | 46 +++++++++-------------
 8 files changed, 38 insertions(+), 60 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c
index 2a6ce76656aa..6b113881aefb 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_device.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_device.c
@@ -427,13 +427,6 @@ struct msm_gpu *adreno_load_gpu(struct drm_device *dev)
 	return gpu;
 }
 
-static void set_gpu_pdev(struct drm_device *dev,
-		struct platform_device *pdev)
-{
-	struct msm_drm_private *priv = dev->dev_private;
-	priv->gpu_pdev = pdev;
-}
-
 static int find_chipid(struct device *dev, struct adreno_rev *rev)
 {
 	struct device_node *node = dev->of_node;
@@ -482,8 +475,8 @@ static int adreno_bind(struct device *dev, struct device *master, void *data)
 {
 	static struct adreno_platform_config config = {};
 	const struct adreno_info *info;
-	struct drm_device *drm = dev_get_drvdata(master);
-	struct msm_drm_private *priv = drm->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(master);
+	struct drm_device *drm = priv->dev;
 	struct msm_gpu *gpu;
 	int ret;
 
@@ -492,7 +485,7 @@ static int adreno_bind(struct device *dev, struct device *master, void *data)
 		return ret;
 
 	dev->platform_data = &config;
-	set_gpu_pdev(drm, to_platform_device(dev));
+	priv->gpu_pdev = to_platform_device(dev);
 
 	info = adreno_info(config.rev);
 
@@ -521,12 +514,13 @@ static int adreno_bind(struct device *dev, struct device *master, void *data)
 static void adreno_unbind(struct device *dev, struct device *master,
 		void *data)
 {
+	struct msm_drm_private *priv = dev_get_drvdata(master);
 	struct msm_gpu *gpu = dev_to_gpu(dev);
 
 	pm_runtime_force_suspend(dev);
 	gpu->funcs->destroy(gpu);
 
-	set_gpu_pdev(dev_get_drvdata(master), NULL);
+	priv->gpu_pdev = NULL;
 }
 
 static const struct component_ops a3xx_ops = {
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index a15b26428280..8b038690d9ce 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -1153,9 +1153,9 @@ struct msm_kms *dpu_kms_init(struct drm_device *dev)
 
 static int dpu_bind(struct device *dev, struct device *master, void *data)
 {
-	struct drm_device *ddev = dev_get_drvdata(master);
+	struct msm_drm_private *priv = dev_get_drvdata(master);
 	struct platform_device *pdev = to_platform_device(dev);
-	struct msm_drm_private *priv = ddev->dev_private;
+	struct drm_device *ddev = priv->dev;
 	struct dpu_kms *dpu_kms;
 	struct dss_module_power *mp;
 	int ret = 0;
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
index 7b242246d4e7..cab6451661b2 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
@@ -936,7 +936,8 @@ static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
 
 static int mdp5_bind(struct device *dev, struct device *master, void *data)
 {
-	struct drm_device *ddev = dev_get_drvdata(master);
+	struct msm_drm_private *priv = dev_get_drvdata(master);
+	struct drm_device *ddev = priv->dev;
 	struct platform_device *pdev = to_platform_device(dev);
 
 	DBG("");
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 0eb3c007d503..ac29a8a99450 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -224,13 +224,10 @@ static int dp_display_bind(struct device *dev, struct device *master,
 {
 	int rc = 0;
 	struct dp_display_private *dp = dev_get_dp_display_private(dev);
-	struct msm_drm_private *priv;
-	struct drm_device *drm;
-
-	drm = dev_get_drvdata(master);
+	struct msm_drm_private *priv = dev_get_drvdata(master);
+	struct drm_device *drm = priv->dev;
 
 	dp->dp_display.drm_dev = drm;
-	priv = drm->dev_private;
 	priv->dp[dp->id] = &dp->dp_display;
 
 	rc = dp->parser->parse(dp->parser, dp->dp_display.connector_type);
@@ -266,8 +263,7 @@ static void dp_display_unbind(struct device *dev, struct device *master,
 			      void *data)
 {
 	struct dp_display_private *dp = dev_get_dp_display_private(dev);
-	struct drm_device *drm = dev_get_drvdata(master);
-	struct msm_drm_private *priv = drm->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(master);
 
 	dp_power_client_deinit(dp->power);
 	dp_aux_unregister(dp->aux);
diff --git a/drivers/gpu/drm/msm/dsi/dsi.c b/drivers/gpu/drm/msm/dsi/dsi.c
index 5cd230a5d5d3..9670e548b3e9 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.c
+++ b/drivers/gpu/drm/msm/dsi/dsi.c
@@ -110,8 +110,7 @@ static struct msm_dsi *dsi_init(struct platform_device *pdev)
 
 static int dsi_bind(struct device *dev, struct device *master, void *data)
 {
-	struct drm_device *drm = dev_get_drvdata(master);
-	struct msm_drm_private *priv = drm->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(master);
 	struct msm_dsi *msm_dsi = dev_get_drvdata(dev);
 
 	priv->dsi[msm_dsi->id] = msm_dsi;
@@ -122,8 +121,7 @@ static int dsi_bind(struct device *dev, struct device *master, void *data)
 static void dsi_unbind(struct device *dev, struct device *master,
 		void *data)
 {
-	struct drm_device *drm = dev_get_drvdata(master);
-	struct msm_drm_private *priv = drm->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(master);
 	struct msm_dsi *msm_dsi = dev_get_drvdata(dev);
 
 	priv->dsi[msm_dsi->id] = NULL;
diff --git a/drivers/gpu/drm/msm/edp/edp.c b/drivers/gpu/drm/msm/edp/edp.c
index 106a67473af5..101cf1671472 100644
--- a/drivers/gpu/drm/msm/edp/edp.c
+++ b/drivers/gpu/drm/msm/edp/edp.c
@@ -66,8 +66,7 @@ static struct msm_edp *edp_init(struct platform_device *pdev)
 
 static int edp_bind(struct device *dev, struct device *master, void *data)
 {
-	struct drm_device *drm = dev_get_drvdata(master);
-	struct msm_drm_private *priv = drm->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(master);
 	struct msm_edp *edp;
 
 	DBG("");
@@ -81,8 +80,7 @@ static int edp_bind(struct device *dev, struct device *master, void *data)
 
 static void edp_unbind(struct device *dev, struct device *master, void *data)
 {
-	struct drm_device *drm = dev_get_drvdata(master);
-	struct msm_drm_private *priv = drm->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(master);
 
 	DBG("");
 	if (priv->edp) {
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
index 75b64e6ae035..64ad73a01edd 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
@@ -514,8 +514,7 @@ static int msm_hdmi_register_audio_driver(struct hdmi *hdmi, struct device *dev)
 
 static int msm_hdmi_bind(struct device *dev, struct device *master, void *data)
 {
-	struct drm_device *drm = dev_get_drvdata(master);
-	struct msm_drm_private *priv = drm->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(master);
 	struct hdmi_platform_config *hdmi_cfg;
 	struct hdmi *hdmi;
 	struct device_node *of_node = dev->of_node;
@@ -586,8 +585,8 @@ static int msm_hdmi_bind(struct device *dev, struct device *master, void *data)
 static void msm_hdmi_unbind(struct device *dev, struct device *master,
 		void *data)
 {
-	struct drm_device *drm = dev_get_drvdata(master);
-	struct msm_drm_private *priv = drm->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(master);
+
 	if (priv->hdmi) {
 		if (priv->hdmi->audio_pdev)
 			platform_device_unregister(priv->hdmi->audio_pdev);
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 892c04365239..64230e473a34 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -339,8 +339,8 @@ static int vblank_ctrl_queue_work(struct msm_drm_private *priv,
 static int msm_drm_uninit(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
-	struct drm_device *ddev = platform_get_drvdata(pdev);
-	struct msm_drm_private *priv = ddev->dev_private;
+	struct msm_drm_private *priv = platform_get_drvdata(pdev);
+	struct drm_device *ddev = priv->dev;
 	struct msm_kms *kms = priv->kms;
 	struct msm_mdss *mdss = priv->mdss;
 	int i;
@@ -409,7 +409,6 @@ static int msm_drm_uninit(struct device *dev)
 	drm_dev_put(ddev);
 
 	destroy_workqueue(priv->wq);
-	kfree(priv);
 
 	return 0;
 }
@@ -512,8 +511,8 @@ static int msm_init_vram(struct drm_device *dev)
 static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 {
 	struct platform_device *pdev = to_platform_device(dev);
+	struct msm_drm_private *priv = dev_get_drvdata(dev);
 	struct drm_device *ddev;
-	struct msm_drm_private *priv;
 	struct msm_kms *kms;
 	struct msm_mdss *mdss;
 	int ret, i;
@@ -523,15 +522,6 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 		DRM_DEV_ERROR(dev, "failed to allocate drm_device\n");
 		return PTR_ERR(ddev);
 	}
-
-	platform_set_drvdata(pdev, ddev);
-
-	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-	if (!priv) {
-		ret = -ENOMEM;
-		goto err_put_drm_dev;
-	}
-
 	ddev->dev_private = priv;
 	priv->dev = ddev;
 
@@ -547,7 +537,7 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 		break;
 	}
 	if (ret)
-		goto err_free_priv;
+		goto err_put_drm_dev;
 
 	mdss = priv->mdss;
 
@@ -685,11 +675,8 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 err_destroy_mdss:
 	if (mdss && mdss->funcs)
 		mdss->funcs->destroy(ddev);
-err_free_priv:
-	kfree(priv);
 err_put_drm_dev:
 	drm_dev_put(ddev);
-	platform_set_drvdata(pdev, NULL);
 	return ret;
 }
 
@@ -1142,8 +1129,7 @@ static const struct drm_driver msm_driver = {
 
 static int __maybe_unused msm_runtime_suspend(struct device *dev)
 {
-	struct drm_device *ddev = dev_get_drvdata(dev);
-	struct msm_drm_private *priv = ddev->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(dev);
 	struct msm_mdss *mdss = priv->mdss;
 
 	DBG("");
@@ -1156,8 +1142,7 @@ static int __maybe_unused msm_runtime_suspend(struct device *dev)
 
 static int __maybe_unused msm_runtime_resume(struct device *dev)
 {
-	struct drm_device *ddev = dev_get_drvdata(dev);
-	struct msm_drm_private *priv = ddev->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(dev);
 	struct msm_mdss *mdss = priv->mdss;
 
 	DBG("");
@@ -1187,8 +1172,8 @@ static int __maybe_unused msm_pm_resume(struct device *dev)
 
 static int __maybe_unused msm_pm_prepare(struct device *dev)
 {
-	struct drm_device *ddev = dev_get_drvdata(dev);
-	struct msm_drm_private *priv = ddev ? ddev->dev_private : NULL;
+	struct msm_drm_private *priv = dev_get_drvdata(dev);
+	struct drm_device *ddev = priv ? priv->dev : NULL;
 
 	if (!priv || !priv->kms)
 		return 0;
@@ -1198,8 +1183,8 @@ static int __maybe_unused msm_pm_prepare(struct device *dev)
 
 static void __maybe_unused msm_pm_complete(struct device *dev)
 {
-	struct drm_device *ddev = dev_get_drvdata(dev);
-	struct msm_drm_private *priv = ddev ? ddev->dev_private : NULL;
+	struct msm_drm_private *priv = dev_get_drvdata(dev);
+	struct drm_device *ddev = priv ? priv->dev : NULL;
 
 	if (!priv || !priv->kms)
 		return;
@@ -1397,8 +1382,15 @@ static const struct component_master_ops msm_drm_ops = {
 static int msm_pdev_probe(struct platform_device *pdev)
 {
 	struct component_match *match = NULL;
+	struct msm_drm_private *priv;
 	int ret;
 
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, priv);
+
 	if (get_mdp_ver(pdev)) {
 		ret = add_display_components(pdev, &match);
 		if (ret)
@@ -1437,8 +1429,8 @@ static int msm_pdev_remove(struct platform_device *pdev)
 
 static void msm_pdev_shutdown(struct platform_device *pdev)
 {
-	struct drm_device *drm = platform_get_drvdata(pdev);
-	struct msm_drm_private *priv = drm ? drm->dev_private : NULL;
+	struct msm_drm_private *priv = platform_get_drvdata(pdev);
+	struct drm_device *drm = priv ? priv->dev : NULL;
 
 	if (!priv || !priv->kms)
 		return;
-- 
2.33.1

[PATCH v3 1/2] drm/msm: Allocate msm_drm_private early and pass it as driver data

[AngeloGioacchino Del Regno]

In preparation for registering the mdss interrupt controller earlier,
move the allocation of msm_drm_private from component bind time to
msm_drv probe; this also allows us to use the devm variant of kzalloc.

Since it is not right to allocate the drm_device at probe time (as
it should exist only when all components are bound, and taken down
when components get cleaned up), the only way to make this happen is
to pass a pointer to msm_drm_private as driver data (like done in
many other DRM drivers), instead of one to drm_device like it's
currently done in this driver.

This is also simplifying some bind/unbind functions around drm/msm,
as some of them are using drm_device just to grab a pointer to the
msm_drm_private structure, which we now retrieve in one call.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/gpu/drm/msm/adreno/adreno_device.c | 16 +++-----
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c    |  4 +-
 drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c   |  3 +-
 drivers/gpu/drm/msm/dp/dp_display.c        | 10 ++---
 drivers/gpu/drm/msm/dsi/dsi.c              |  6 +--
 drivers/gpu/drm/msm/edp/edp.c              |  6 +--
 drivers/gpu/drm/msm/hdmi/hdmi.c            |  7 ++--
 drivers/gpu/drm/msm/msm_drv.c              | 46 +++++++++-------------
 8 files changed, 38 insertions(+), 60 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c
index 2a6ce76656aa..6b113881aefb 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_device.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_device.c
@@ -427,13 +427,6 @@ struct msm_gpu *adreno_load_gpu(struct drm_device *dev)
 	return gpu;
 }
 
-static void set_gpu_pdev(struct drm_device *dev,
-		struct platform_device *pdev)
-{
-	struct msm_drm_private *priv = dev->dev_private;
-	priv->gpu_pdev = pdev;
-}
-
 static int find_chipid(struct device *dev, struct adreno_rev *rev)
 {
 	struct device_node *node = dev->of_node;
@@ -482,8 +475,8 @@ static int adreno_bind(struct device *dev, struct device *master, void *data)
 {
 	static struct adreno_platform_config config = {};
 	const struct adreno_info *info;
-	struct drm_device *drm = dev_get_drvdata(master);
-	struct msm_drm_private *priv = drm->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(master);
+	struct drm_device *drm = priv->dev;
 	struct msm_gpu *gpu;
 	int ret;
 
@@ -492,7 +485,7 @@ static int adreno_bind(struct device *dev, struct device *master, void *data)
 		return ret;
 
 	dev->platform_data = &config;
-	set_gpu_pdev(drm, to_platform_device(dev));
+	priv->gpu_pdev = to_platform_device(dev);
 
 	info = adreno_info(config.rev);
 
@@ -521,12 +514,13 @@ static int adreno_bind(struct device *dev, struct device *master, void *data)
 static void adreno_unbind(struct device *dev, struct device *master,
 		void *data)
 {
+	struct msm_drm_private *priv = dev_get_drvdata(master);
 	struct msm_gpu *gpu = dev_to_gpu(dev);
 
 	pm_runtime_force_suspend(dev);
 	gpu->funcs->destroy(gpu);
 
-	set_gpu_pdev(dev_get_drvdata(master), NULL);
+	priv->gpu_pdev = NULL;
 }
 
 static const struct component_ops a3xx_ops = {
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index a15b26428280..8b038690d9ce 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -1153,9 +1153,9 @@ struct msm_kms *dpu_kms_init(struct drm_device *dev)
 
 static int dpu_bind(struct device *dev, struct device *master, void *data)
 {
-	struct drm_device *ddev = dev_get_drvdata(master);
+	struct msm_drm_private *priv = dev_get_drvdata(master);
 	struct platform_device *pdev = to_platform_device(dev);
-	struct msm_drm_private *priv = ddev->dev_private;
+	struct drm_device *ddev = priv->dev;
 	struct dpu_kms *dpu_kms;
 	struct dss_module_power *mp;
 	int ret = 0;
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
index 7b242246d4e7..cab6451661b2 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
@@ -936,7 +936,8 @@ static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
 
 static int mdp5_bind(struct device *dev, struct device *master, void *data)
 {
-	struct drm_device *ddev = dev_get_drvdata(master);
+	struct msm_drm_private *priv = dev_get_drvdata(master);
+	struct drm_device *ddev = priv->dev;
 	struct platform_device *pdev = to_platform_device(dev);
 
 	DBG("");
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 0eb3c007d503..ac29a8a99450 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -224,13 +224,10 @@ static int dp_display_bind(struct device *dev, struct device *master,
 {
 	int rc = 0;
 	struct dp_display_private *dp = dev_get_dp_display_private(dev);
-	struct msm_drm_private *priv;
-	struct drm_device *drm;
-
-	drm = dev_get_drvdata(master);
+	struct msm_drm_private *priv = dev_get_drvdata(master);
+	struct drm_device *drm = priv->dev;
 
 	dp->dp_display.drm_dev = drm;
-	priv = drm->dev_private;
 	priv->dp[dp->id] = &dp->dp_display;
 
 	rc = dp->parser->parse(dp->parser, dp->dp_display.connector_type);
@@ -266,8 +263,7 @@ static void dp_display_unbind(struct device *dev, struct device *master,
 			      void *data)
 {
 	struct dp_display_private *dp = dev_get_dp_display_private(dev);
-	struct drm_device *drm = dev_get_drvdata(master);
-	struct msm_drm_private *priv = drm->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(master);
 
 	dp_power_client_deinit(dp->power);
 	dp_aux_unregister(dp->aux);
diff --git a/drivers/gpu/drm/msm/dsi/dsi.c b/drivers/gpu/drm/msm/dsi/dsi.c
index 5cd230a5d5d3..9670e548b3e9 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.c
+++ b/drivers/gpu/drm/msm/dsi/dsi.c
@@ -110,8 +110,7 @@ static struct msm_dsi *dsi_init(struct platform_device *pdev)
 
 static int dsi_bind(struct device *dev, struct device *master, void *data)
 {
-	struct drm_device *drm = dev_get_drvdata(master);
-	struct msm_drm_private *priv = drm->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(master);
 	struct msm_dsi *msm_dsi = dev_get_drvdata(dev);
 
 	priv->dsi[msm_dsi->id] = msm_dsi;
@@ -122,8 +121,7 @@ static int dsi_bind(struct device *dev, struct device *master, void *data)
 static void dsi_unbind(struct device *dev, struct device *master,
 		void *data)
 {
-	struct drm_device *drm = dev_get_drvdata(master);
-	struct msm_drm_private *priv = drm->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(master);
 	struct msm_dsi *msm_dsi = dev_get_drvdata(dev);
 
 	priv->dsi[msm_dsi->id] = NULL;
diff --git a/drivers/gpu/drm/msm/edp/edp.c b/drivers/gpu/drm/msm/edp/edp.c
index 106a67473af5..101cf1671472 100644
--- a/drivers/gpu/drm/msm/edp/edp.c
+++ b/drivers/gpu/drm/msm/edp/edp.c
@@ -66,8 +66,7 @@ static struct msm_edp *edp_init(struct platform_device *pdev)
 
 static int edp_bind(struct device *dev, struct device *master, void *data)
 {
-	struct drm_device *drm = dev_get_drvdata(master);
-	struct msm_drm_private *priv = drm->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(master);
 	struct msm_edp *edp;
 
 	DBG("");
@@ -81,8 +80,7 @@ static int edp_bind(struct device *dev, struct device *master, void *data)
 
 static void edp_unbind(struct device *dev, struct device *master, void *data)
 {
-	struct drm_device *drm = dev_get_drvdata(master);
-	struct msm_drm_private *priv = drm->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(master);
 
 	DBG("");
 	if (priv->edp) {
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
index 75b64e6ae035..64ad73a01edd 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
@@ -514,8 +514,7 @@ static int msm_hdmi_register_audio_driver(struct hdmi *hdmi, struct device *dev)
 
 static int msm_hdmi_bind(struct device *dev, struct device *master, void *data)
 {
-	struct drm_device *drm = dev_get_drvdata(master);
-	struct msm_drm_private *priv = drm->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(master);
 	struct hdmi_platform_config *hdmi_cfg;
 	struct hdmi *hdmi;
 	struct device_node *of_node = dev->of_node;
@@ -586,8 +585,8 @@ static int msm_hdmi_bind(struct device *dev, struct device *master, void *data)
 static void msm_hdmi_unbind(struct device *dev, struct device *master,
 		void *data)
 {
-	struct drm_device *drm = dev_get_drvdata(master);
-	struct msm_drm_private *priv = drm->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(master);
+
 	if (priv->hdmi) {
 		if (priv->hdmi->audio_pdev)
 			platform_device_unregister(priv->hdmi->audio_pdev);
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 892c04365239..64230e473a34 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -339,8 +339,8 @@ static int vblank_ctrl_queue_work(struct msm_drm_private *priv,
 static int msm_drm_uninit(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
-	struct drm_device *ddev = platform_get_drvdata(pdev);
-	struct msm_drm_private *priv = ddev->dev_private;
+	struct msm_drm_private *priv = platform_get_drvdata(pdev);
+	struct drm_device *ddev = priv->dev;
 	struct msm_kms *kms = priv->kms;
 	struct msm_mdss *mdss = priv->mdss;
 	int i;
@@ -409,7 +409,6 @@ static int msm_drm_uninit(struct device *dev)
 	drm_dev_put(ddev);
 
 	destroy_workqueue(priv->wq);
-	kfree(priv);
 
 	return 0;
 }
@@ -512,8 +511,8 @@ static int msm_init_vram(struct drm_device *dev)
 static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 {
 	struct platform_device *pdev = to_platform_device(dev);
+	struct msm_drm_private *priv = dev_get_drvdata(dev);
 	struct drm_device *ddev;
-	struct msm_drm_private *priv;
 	struct msm_kms *kms;
 	struct msm_mdss *mdss;
 	int ret, i;
@@ -523,15 +522,6 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 		DRM_DEV_ERROR(dev, "failed to allocate drm_device\n");
 		return PTR_ERR(ddev);
 	}
-
-	platform_set_drvdata(pdev, ddev);
-
-	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-	if (!priv) {
-		ret = -ENOMEM;
-		goto err_put_drm_dev;
-	}
-
 	ddev->dev_private = priv;
 	priv->dev = ddev;
 
@@ -547,7 +537,7 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 		break;
 	}
 	if (ret)
-		goto err_free_priv;
+		goto err_put_drm_dev;
 
 	mdss = priv->mdss;
 
@@ -685,11 +675,8 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 err_destroy_mdss:
 	if (mdss && mdss->funcs)
 		mdss->funcs->destroy(ddev);
-err_free_priv:
-	kfree(priv);
 err_put_drm_dev:
 	drm_dev_put(ddev);
-	platform_set_drvdata(pdev, NULL);
 	return ret;
 }
 
@@ -1142,8 +1129,7 @@ static const struct drm_driver msm_driver = {
 
 static int __maybe_unused msm_runtime_suspend(struct device *dev)
 {
-	struct drm_device *ddev = dev_get_drvdata(dev);
-	struct msm_drm_private *priv = ddev->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(dev);
 	struct msm_mdss *mdss = priv->mdss;
 
 	DBG("");
@@ -1156,8 +1142,7 @@ static int __maybe_unused msm_runtime_suspend(struct device *dev)
 
 static int __maybe_unused msm_runtime_resume(struct device *dev)
 {
-	struct drm_device *ddev = dev_get_drvdata(dev);
-	struct msm_drm_private *priv = ddev->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(dev);
 	struct msm_mdss *mdss = priv->mdss;
 
 	DBG("");
@@ -1187,8 +1172,8 @@ static int __maybe_unused msm_pm_resume(struct device *dev)
 
 static int __maybe_unused msm_pm_prepare(struct device *dev)
 {
-	struct drm_device *ddev = dev_get_drvdata(dev);
-	struct msm_drm_private *priv = ddev ? ddev->dev_private : NULL;
+	struct msm_drm_private *priv = dev_get_drvdata(dev);
+	struct drm_device *ddev = priv ? priv->dev : NULL;
 
 	if (!priv || !priv->kms)
 		return 0;
@@ -1198,8 +1183,8 @@ static int __maybe_unused msm_pm_prepare(struct device *dev)
 
 static void __maybe_unused msm_pm_complete(struct device *dev)
 {
-	struct drm_device *ddev = dev_get_drvdata(dev);
-	struct msm_drm_private *priv = ddev ? ddev->dev_private : NULL;
+	struct msm_drm_private *priv = dev_get_drvdata(dev);
+	struct drm_device *ddev = priv ? priv->dev : NULL;
 
 	if (!priv || !priv->kms)
 		return;
@@ -1397,8 +1382,15 @@ static const struct component_master_ops msm_drm_ops = {
 static int msm_pdev_probe(struct platform_device *pdev)
 {
 	struct component_match *match = NULL;
+	struct msm_drm_private *priv;
 	int ret;
 
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, priv);
+
 	if (get_mdp_ver(pdev)) {
 		ret = add_display_components(pdev, &match);
 		if (ret)
@@ -1437,8 +1429,8 @@ static int msm_pdev_remove(struct platform_device *pdev)
 
 static void msm_pdev_shutdown(struct platform_device *pdev)
 {
-	struct drm_device *drm = platform_get_drvdata(pdev);
-	struct msm_drm_private *priv = drm ? drm->dev_private : NULL;
+	struct msm_drm_private *priv = platform_get_drvdata(pdev);
+	struct drm_device *drm = priv ? priv->dev : NULL;
 
 	if (!priv || !priv->kms)
 		return;
-- 
2.33.1

[PATCH v3 2/2] drm/msm: Initialize MDSS irq domain at probe time

[AngeloGioacchino Del Regno]

Since commit 8f59ee9a570c ("drm/msm/dsi: Adjust probe order"), the
DSI host gets initialized earlier, but this caused unability to probe
the entire stack of components because they all depend on interrupts
coming from the main `mdss` node (mdp5, or dpu1).

To fix this issue, anticipate registering the irq domain from mdp5/dpu1
at msm_mdev_probe() time, as to make sure that the interrupt controller
is available before dsi and/or other components try to initialize,
finally satisfying the dependency.

Moreover, to balance this operation while avoiding to always check if
the irq domain is registered everytime we call bind() on msm_pdev, add
a new *remove function pointer to msm_mdss_funcs, used to remove the
irq domain only at msm_pdev_remove() time.

Fixes: 8f59ee9a570c ("drm/msm/dsi: Adjust probe order")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c  | 50 ++++++++++++-------
 drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c | 58 +++++++++++++++--------
 drivers/gpu/drm/msm/msm_drv.c             | 22 ++++++++-
 drivers/gpu/drm/msm/msm_kms.h             |  3 ++
 4 files changed, 95 insertions(+), 38 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
index b466784d9822..6c2569175633 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
@@ -106,13 +106,10 @@ static const struct irq_domain_ops dpu_mdss_irqdomain_ops = {
 	.xlate = irq_domain_xlate_onecell,
 };
 
-static int _dpu_mdss_irq_domain_add(struct dpu_mdss *dpu_mdss)
+static int _dpu_mdss_irq_domain_add(struct device *dev, struct dpu_mdss *dpu_mdss)
 {
-	struct device *dev;
 	struct irq_domain *domain;
 
-	dev = dpu_mdss->base.dev->dev;
-
 	domain = irq_domain_add_linear(dev->of_node, 32,
 			&dpu_mdss_irqdomain_ops, dpu_mdss);
 	if (!domain) {
@@ -194,7 +191,6 @@ static void dpu_mdss_destroy(struct drm_device *dev)
 
 	pm_runtime_suspend(dev->dev);
 	pm_runtime_disable(dev->dev);
-	_dpu_mdss_irq_domain_fini(dpu_mdss);
 	irq = platform_get_irq(pdev, 0);
 	irq_set_chained_handler_and_data(irq, NULL, NULL);
 	msm_dss_put_clk(mp->clk_config, mp->num_clk);
@@ -203,15 +199,43 @@ static void dpu_mdss_destroy(struct drm_device *dev)
 	if (dpu_mdss->mmio)
 		devm_iounmap(&pdev->dev, dpu_mdss->mmio);
 	dpu_mdss->mmio = NULL;
-	priv->mdss = NULL;
+}
+
+static void dpu_mdss_remove(struct msm_mdss *mdss)
+{
+	_dpu_mdss_irq_domain_fini(to_dpu_mdss(mdss));
 }
 
 static const struct msm_mdss_funcs mdss_funcs = {
 	.enable	= dpu_mdss_enable,
 	.disable = dpu_mdss_disable,
 	.destroy = dpu_mdss_destroy,
+	.remove = dpu_mdss_remove,
 };
 
+int dpu_mdss_early_init(struct device *dev, struct msm_drm_private *priv)
+{
+	struct dpu_mdss *dpu_mdss;
+	int ret;
+
+	dpu_mdss = devm_kzalloc(dev, sizeof(*dpu_mdss), GFP_KERNEL);
+	if (!dpu_mdss)
+		return -ENOMEM;
+
+	ret = _dpu_mdss_irq_domain_add(dev, dpu_mdss);
+	if (ret)
+		return ret;
+
+	/*
+	 * Here we have no drm_device yet, but still do the assignment
+	 * so that we can retrieve our struct dpu_mdss from the main
+	 * init function, since we allocate it here.
+	 */
+	priv->mdss = &dpu_mdss->base;
+
+	return 0;
+}
+
 int dpu_mdss_init(struct drm_device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev->dev);
@@ -221,9 +245,9 @@ int dpu_mdss_init(struct drm_device *dev)
 	int ret;
 	int irq;
 
-	dpu_mdss = devm_kzalloc(dev->dev, sizeof(*dpu_mdss), GFP_KERNEL);
+	dpu_mdss = to_dpu_mdss(priv->mdss);
 	if (!dpu_mdss)
-		return -ENOMEM;
+		return -ENODATA;
 
 	dpu_mdss->mmio = msm_ioremap(pdev, "mdss", "mdss");
 	if (IS_ERR(dpu_mdss->mmio))
@@ -241,10 +265,6 @@ int dpu_mdss_init(struct drm_device *dev)
 	dpu_mdss->base.dev = dev;
 	dpu_mdss->base.funcs = &mdss_funcs;
 
-	ret = _dpu_mdss_irq_domain_add(dpu_mdss);
-	if (ret)
-		goto irq_domain_error;
-
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		ret = irq;
@@ -253,16 +273,10 @@ int dpu_mdss_init(struct drm_device *dev)
 
 	irq_set_chained_handler_and_data(irq, dpu_mdss_irq,
 					 dpu_mdss);
-
-	priv->mdss = &dpu_mdss->base;
-
 	pm_runtime_enable(dev->dev);
-
 	return 0;
 
 irq_error:
-	_dpu_mdss_irq_domain_fini(dpu_mdss);
-irq_domain_error:
 	msm_dss_put_clk(mp->clk_config, mp->num_clk);
 clk_parse_err:
 	devm_kfree(&pdev->dev, mp->clk_config);
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c
index 0ea53420bc40..a99538ae4182 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c
@@ -112,9 +112,8 @@ static const struct irq_domain_ops mdss_hw_irqdomain_ops = {
 };
 
 
-static int mdss_irq_domain_init(struct mdp5_mdss *mdp5_mdss)
+static int mdss_irq_domain_init(struct device *dev, struct mdp5_mdss *mdp5_mdss)
 {
-	struct device *dev = mdp5_mdss->base.dev->dev;
 	struct irq_domain *d;
 
 	d = irq_domain_add_linear(dev->of_node, 32, &mdss_hw_irqdomain_ops,
@@ -182,20 +181,52 @@ static void mdp5_mdss_destroy(struct drm_device *dev)
 	if (!mdp5_mdss)
 		return;
 
-	irq_domain_remove(mdp5_mdss->irqcontroller.domain);
-	mdp5_mdss->irqcontroller.domain = NULL;
-
 	regulator_disable(mdp5_mdss->vdd);
 
 	pm_runtime_disable(dev->dev);
 }
 
+static void mdp5_mdss_remove(struct msm_mdss *mdss)
+{
+	struct mdp5_mdss *mdp5_mdss = to_mdp5_mdss(mdss);
+
+	irq_domain_remove(mdp5_mdss->irqcontroller.domain);
+	mdp5_mdss->irqcontroller.domain = NULL;
+}
+
 static const struct msm_mdss_funcs mdss_funcs = {
 	.enable	= mdp5_mdss_enable,
 	.disable = mdp5_mdss_disable,
 	.destroy = mdp5_mdss_destroy,
+	.remove = mdp5_mdss_remove,
 };
 
+int mdp5_mdss_early_init(struct device *dev, struct msm_drm_private *priv)
+{
+	struct mdp5_mdss *mdp5_mdss;
+	int ret;
+
+	if (!of_device_is_compatible(dev->of_node, "qcom,mdss"))
+		return 0;
+
+	mdp5_mdss = devm_kzalloc(dev, sizeof(*mdp5_mdss), GFP_KERNEL);
+	if (!mdp5_mdss)
+		return -ENOMEM;
+
+	ret = mdss_irq_domain_init(dev, mdp5_mdss);
+	if (ret)
+		return ret;
+
+	/*
+	 * Here we have no drm_device yet, but still do the assignment
+	 * so that we can retrieve our struct mdp5_mdss from the main
+	 * init function, since we allocate it here.
+	 */
+	priv->mdss = &mdp5_mdss->base;
+
+	return 0;
+}
+
 int mdp5_mdss_init(struct drm_device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev->dev);
@@ -208,11 +239,9 @@ int mdp5_mdss_init(struct drm_device *dev)
 	if (!of_device_is_compatible(dev->dev->of_node, "qcom,mdss"))
 		return 0;
 
-	mdp5_mdss = devm_kzalloc(dev->dev, sizeof(*mdp5_mdss), GFP_KERNEL);
-	if (!mdp5_mdss) {
-		ret = -ENOMEM;
-		goto fail;
-	}
+	mdp5_mdss = to_mdp5_mdss(priv->mdss);
+	if (!mdp5_mdss)
+		return -ENODATA;
 
 	mdp5_mdss->base.dev = dev;
 
@@ -255,17 +284,8 @@ int mdp5_mdss_init(struct drm_device *dev)
 		goto fail_irq;
 	}
 
-	ret = mdss_irq_domain_init(mdp5_mdss);
-	if (ret) {
-		DRM_DEV_ERROR(dev->dev, "failed to init sub-block irqs: %d\n", ret);
-		goto fail_irq;
-	}
-
 	mdp5_mdss->base.funcs = &mdss_funcs;
-	priv->mdss = &mdp5_mdss->base;
-
 	pm_runtime_enable(dev->dev);
-
 	return 0;
 fail_irq:
 	regulator_disable(mdp5_mdss->vdd);
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 64230e473a34..ded4f4d6545f 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -1389,6 +1389,20 @@ static int msm_pdev_probe(struct platform_device *pdev)
 	if (!priv)
 		return -ENOMEM;
 
+	switch (get_mdp_ver(pdev)) {
+	case KMS_MDP5:
+		ret = mdp5_mdss_early_init(&pdev->dev, priv);
+		break;
+	case KMS_DPU:
+		ret = dpu_mdss_early_init(&pdev->dev, priv);
+		break;
+	default:
+		ret = 0;
+		break;
+	}
+	if (ret)
+		return ret;
+
 	platform_set_drvdata(pdev, priv);
 
 	if (get_mdp_ver(pdev)) {
@@ -1421,6 +1435,12 @@ static int msm_pdev_probe(struct platform_device *pdev)
 
 static int msm_pdev_remove(struct platform_device *pdev)
 {
+	struct msm_drm_private *priv = platform_get_drvdata(pdev);
+
+	if (priv->mdss && priv->mdss->funcs)
+		priv->mdss->funcs->remove(priv->mdss);
+
+	priv->mdss = NULL;
 	component_master_del(&pdev->dev, &msm_drm_ops);
 	of_platform_depopulate(&pdev->dev);
 
@@ -1432,7 +1452,7 @@ static void msm_pdev_shutdown(struct platform_device *pdev)
 	struct msm_drm_private *priv = platform_get_drvdata(pdev);
 	struct drm_device *drm = priv ? priv->dev : NULL;
 
-	if (!priv || !priv->kms)
+	if (!priv || !priv->kms || !drm->mode_config.funcs)
 		return;
 
 	drm_atomic_helper_shutdown(drm);
diff --git a/drivers/gpu/drm/msm/msm_kms.h b/drivers/gpu/drm/msm/msm_kms.h
index 6a42b819abc4..2c539a228156 100644
--- a/drivers/gpu/drm/msm/msm_kms.h
+++ b/drivers/gpu/drm/msm/msm_kms.h
@@ -202,6 +202,7 @@ struct msm_mdss_funcs {
 	int (*enable)(struct msm_mdss *mdss);
 	int (*disable)(struct msm_mdss *mdss);
 	void (*destroy)(struct drm_device *dev);
+	void (*remove)(struct msm_mdss *mdss);
 };
 
 struct msm_mdss {
@@ -209,7 +210,9 @@ struct msm_mdss {
 	const struct msm_mdss_funcs *funcs;
 };
 
+int mdp5_mdss_early_init(struct device *dev, struct msm_drm_private *priv);
 int mdp5_mdss_init(struct drm_device *dev);
+int dpu_mdss_early_init(struct device *dev, struct msm_drm_private *priv);
 int dpu_mdss_init(struct drm_device *dev);
 
 #define for_each_crtc_mask(dev, crtc, crtc_mask) \
-- 
2.33.1

[PATCH v3 2/2] drm/msm: Initialize MDSS irq domain at probe time

[AngeloGioacchino Del Regno]

Since commit 8f59ee9a570c ("drm/msm/dsi: Adjust probe order"), the
DSI host gets initialized earlier, but this caused unability to probe
the entire stack of components because they all depend on interrupts
coming from the main `mdss` node (mdp5, or dpu1).

To fix this issue, anticipate registering the irq domain from mdp5/dpu1
at msm_mdev_probe() time, as to make sure that the interrupt controller
is available before dsi and/or other components try to initialize,
finally satisfying the dependency.

Moreover, to balance this operation while avoiding to always check if
the irq domain is registered everytime we call bind() on msm_pdev, add
a new *remove function pointer to msm_mdss_funcs, used to remove the
irq domain only at msm_pdev_remove() time.

Fixes: 8f59ee9a570c ("drm/msm/dsi: Adjust probe order")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c  | 50 ++++++++++++-------
 drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c | 58 +++++++++++++++--------
 drivers/gpu/drm/msm/msm_drv.c             | 22 ++++++++-
 drivers/gpu/drm/msm/msm_kms.h             |  3 ++
 4 files changed, 95 insertions(+), 38 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
index b466784d9822..6c2569175633 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
@@ -106,13 +106,10 @@ static const struct irq_domain_ops dpu_mdss_irqdomain_ops = {
 	.xlate = irq_domain_xlate_onecell,
 };
 
-static int _dpu_mdss_irq_domain_add(struct dpu_mdss *dpu_mdss)
+static int _dpu_mdss_irq_domain_add(struct device *dev, struct dpu_mdss *dpu_mdss)
 {
-	struct device *dev;
 	struct irq_domain *domain;
 
-	dev = dpu_mdss->base.dev->dev;
-
 	domain = irq_domain_add_linear(dev->of_node, 32,
 			&dpu_mdss_irqdomain_ops, dpu_mdss);
 	if (!domain) {
@@ -194,7 +191,6 @@ static void dpu_mdss_destroy(struct drm_device *dev)
 
 	pm_runtime_suspend(dev->dev);
 	pm_runtime_disable(dev->dev);
-	_dpu_mdss_irq_domain_fini(dpu_mdss);
 	irq = platform_get_irq(pdev, 0);
 	irq_set_chained_handler_and_data(irq, NULL, NULL);
 	msm_dss_put_clk(mp->clk_config, mp->num_clk);
@@ -203,15 +199,43 @@ static void dpu_mdss_destroy(struct drm_device *dev)
 	if (dpu_mdss->mmio)
 		devm_iounmap(&pdev->dev, dpu_mdss->mmio);
 	dpu_mdss->mmio = NULL;
-	priv->mdss = NULL;
+}
+
+static void dpu_mdss_remove(struct msm_mdss *mdss)
+{
+	_dpu_mdss_irq_domain_fini(to_dpu_mdss(mdss));
 }
 
 static const struct msm_mdss_funcs mdss_funcs = {
 	.enable	= dpu_mdss_enable,
 	.disable = dpu_mdss_disable,
 	.destroy = dpu_mdss_destroy,
+	.remove = dpu_mdss_remove,
 };
 
+int dpu_mdss_early_init(struct device *dev, struct msm_drm_private *priv)
+{
+	struct dpu_mdss *dpu_mdss;
+	int ret;
+
+	dpu_mdss = devm_kzalloc(dev, sizeof(*dpu_mdss), GFP_KERNEL);
+	if (!dpu_mdss)
+		return -ENOMEM;
+
+	ret = _dpu_mdss_irq_domain_add(dev, dpu_mdss);
+	if (ret)
+		return ret;
+
+	/*
+	 * Here we have no drm_device yet, but still do the assignment
+	 * so that we can retrieve our struct dpu_mdss from the main
+	 * init function, since we allocate it here.
+	 */
+	priv->mdss = &dpu_mdss->base;
+
+	return 0;
+}
+
 int dpu_mdss_init(struct drm_device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev->dev);
@@ -221,9 +245,9 @@ int dpu_mdss_init(struct drm_device *dev)
 	int ret;
 	int irq;
 
-	dpu_mdss = devm_kzalloc(dev->dev, sizeof(*dpu_mdss), GFP_KERNEL);
+	dpu_mdss = to_dpu_mdss(priv->mdss);
 	if (!dpu_mdss)
-		return -ENOMEM;
+		return -ENODATA;
 
 	dpu_mdss->mmio = msm_ioremap(pdev, "mdss", "mdss");
 	if (IS_ERR(dpu_mdss->mmio))
@@ -241,10 +265,6 @@ int dpu_mdss_init(struct drm_device *dev)
 	dpu_mdss->base.dev = dev;
 	dpu_mdss->base.funcs = &mdss_funcs;
 
-	ret = _dpu_mdss_irq_domain_add(dpu_mdss);
-	if (ret)
-		goto irq_domain_error;
-
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		ret = irq;
@@ -253,16 +273,10 @@ int dpu_mdss_init(struct drm_device *dev)
 
 	irq_set_chained_handler_and_data(irq, dpu_mdss_irq,
 					 dpu_mdss);
-
-	priv->mdss = &dpu_mdss->base;
-
 	pm_runtime_enable(dev->dev);
-
 	return 0;
 
 irq_error:
-	_dpu_mdss_irq_domain_fini(dpu_mdss);
-irq_domain_error:
 	msm_dss_put_clk(mp->clk_config, mp->num_clk);
 clk_parse_err:
 	devm_kfree(&pdev->dev, mp->clk_config);
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c
index 0ea53420bc40..a99538ae4182 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c
@@ -112,9 +112,8 @@ static const struct irq_domain_ops mdss_hw_irqdomain_ops = {
 };
 
 
-static int mdss_irq_domain_init(struct mdp5_mdss *mdp5_mdss)
+static int mdss_irq_domain_init(struct device *dev, struct mdp5_mdss *mdp5_mdss)
 {
-	struct device *dev = mdp5_mdss->base.dev->dev;
 	struct irq_domain *d;
 
 	d = irq_domain_add_linear(dev->of_node, 32, &mdss_hw_irqdomain_ops,
@@ -182,20 +181,52 @@ static void mdp5_mdss_destroy(struct drm_device *dev)
 	if (!mdp5_mdss)
 		return;
 
-	irq_domain_remove(mdp5_mdss->irqcontroller.domain);
-	mdp5_mdss->irqcontroller.domain = NULL;
-
 	regulator_disable(mdp5_mdss->vdd);
 
 	pm_runtime_disable(dev->dev);
 }
 
+static void mdp5_mdss_remove(struct msm_mdss *mdss)
+{
+	struct mdp5_mdss *mdp5_mdss = to_mdp5_mdss(mdss);
+
+	irq_domain_remove(mdp5_mdss->irqcontroller.domain);
+	mdp5_mdss->irqcontroller.domain = NULL;
+}
+
 static const struct msm_mdss_funcs mdss_funcs = {
 	.enable	= mdp5_mdss_enable,
 	.disable = mdp5_mdss_disable,
 	.destroy = mdp5_mdss_destroy,
+	.remove = mdp5_mdss_remove,
 };
 
+int mdp5_mdss_early_init(struct device *dev, struct msm_drm_private *priv)
+{
+	struct mdp5_mdss *mdp5_mdss;
+	int ret;
+
+	if (!of_device_is_compatible(dev->of_node, "qcom,mdss"))
+		return 0;
+
+	mdp5_mdss = devm_kzalloc(dev, sizeof(*mdp5_mdss), GFP_KERNEL);
+	if (!mdp5_mdss)
+		return -ENOMEM;
+
+	ret = mdss_irq_domain_init(dev, mdp5_mdss);
+	if (ret)
+		return ret;
+
+	/*
+	 * Here we have no drm_device yet, but still do the assignment
+	 * so that we can retrieve our struct mdp5_mdss from the main
+	 * init function, since we allocate it here.
+	 */
+	priv->mdss = &mdp5_mdss->base;
+
+	return 0;
+}
+
 int mdp5_mdss_init(struct drm_device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev->dev);
@@ -208,11 +239,9 @@ int mdp5_mdss_init(struct drm_device *dev)
 	if (!of_device_is_compatible(dev->dev->of_node, "qcom,mdss"))
 		return 0;
 
-	mdp5_mdss = devm_kzalloc(dev->dev, sizeof(*mdp5_mdss), GFP_KERNEL);
-	if (!mdp5_mdss) {
-		ret = -ENOMEM;
-		goto fail;
-	}
+	mdp5_mdss = to_mdp5_mdss(priv->mdss);
+	if (!mdp5_mdss)
+		return -ENODATA;
 
 	mdp5_mdss->base.dev = dev;
 
@@ -255,17 +284,8 @@ int mdp5_mdss_init(struct drm_device *dev)
 		goto fail_irq;
 	}
 
-	ret = mdss_irq_domain_init(mdp5_mdss);
-	if (ret) {
-		DRM_DEV_ERROR(dev->dev, "failed to init sub-block irqs: %d\n", ret);
-		goto fail_irq;
-	}
-
 	mdp5_mdss->base.funcs = &mdss_funcs;
-	priv->mdss = &mdp5_mdss->base;
-
 	pm_runtime_enable(dev->dev);
-
 	return 0;
 fail_irq:
 	regulator_disable(mdp5_mdss->vdd);
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 64230e473a34..ded4f4d6545f 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -1389,6 +1389,20 @@ static int msm_pdev_probe(struct platform_device *pdev)
 	if (!priv)
 		return -ENOMEM;
 
+	switch (get_mdp_ver(pdev)) {
+	case KMS_MDP5:
+		ret = mdp5_mdss_early_init(&pdev->dev, priv);
+		break;
+	case KMS_DPU:
+		ret = dpu_mdss_early_init(&pdev->dev, priv);
+		break;
+	default:
+		ret = 0;
+		break;
+	}
+	if (ret)
+		return ret;
+
 	platform_set_drvdata(pdev, priv);
 
 	if (get_mdp_ver(pdev)) {
@@ -1421,6 +1435,12 @@ static int msm_pdev_probe(struct platform_device *pdev)
 
 static int msm_pdev_remove(struct platform_device *pdev)
 {
+	struct msm_drm_private *priv = platform_get_drvdata(pdev);
+
+	if (priv->mdss && priv->mdss->funcs)
+		priv->mdss->funcs->remove(priv->mdss);
+
+	priv->mdss = NULL;
 	component_master_del(&pdev->dev, &msm_drm_ops);
 	of_platform_depopulate(&pdev->dev);
 
@@ -1432,7 +1452,7 @@ static void msm_pdev_shutdown(struct platform_device *pdev)
 	struct msm_drm_private *priv = platform_get_drvdata(pdev);
 	struct drm_device *drm = priv ? priv->dev : NULL;
 
-	if (!priv || !priv->kms)
+	if (!priv || !priv->kms || !drm->mode_config.funcs)
 		return;
 
 	drm_atomic_helper_shutdown(drm);
diff --git a/drivers/gpu/drm/msm/msm_kms.h b/drivers/gpu/drm/msm/msm_kms.h
index 6a42b819abc4..2c539a228156 100644
--- a/drivers/gpu/drm/msm/msm_kms.h
+++ b/drivers/gpu/drm/msm/msm_kms.h
@@ -202,6 +202,7 @@ struct msm_mdss_funcs {
 	int (*enable)(struct msm_mdss *mdss);
 	int (*disable)(struct msm_mdss *mdss);
 	void (*destroy)(struct drm_device *dev);
+	void (*remove)(struct msm_mdss *mdss);
 };
 
 struct msm_mdss {
@@ -209,7 +210,9 @@ struct msm_mdss {
 	const struct msm_mdss_funcs *funcs;
 };
 
+int mdp5_mdss_early_init(struct device *dev, struct msm_drm_private *priv);
 int mdp5_mdss_init(struct drm_device *dev);
+int dpu_mdss_early_init(struct device *dev, struct msm_drm_private *priv);
 int dpu_mdss_init(struct drm_device *dev);
 
 #define for_each_crtc_mask(dev, crtc, crtc_mask) \
-- 
2.33.1

[PATCH] drm/msm: Initialize MDSS irq domain at probe time

[Dmitry Baryshkov]

Since commit 8f59ee9a570c ("drm/msm/dsi: Adjust probe order"), the
DSI host gets initialized earlier, but this caused unability to probe
the entire stack of components because they all depend on interrupts
coming from the main `mdss` node (mdp5, or dpu1).

To fix this issue, move mdss device initialization (which include irq
domain setup) to msm_mdev_probe() time, as to make sure that the
interrupt controller is available before dsi and/or other components try
to initialize, finally satisfying the dependency.

Fixes: 8f59ee9a570c ("drm/msm/dsi: Adjust probe order")
Co-Developed-By: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---

When checking your patch, I noticed that IRQ domain is created before
respective MDSS clocks are enabled. This does not look like causing any
issues at this time, but it did not look good. So I started moving
clocks parsing to early_init() callbacks. And at some point it looked
like we can drop the init()/destroy() callbacks in favour of
early_init() and remove(). Which promted me to move init()/destroy() in
place of early_init()/remove() with few minor fixes here and there.

---
 drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c  | 25 +++++-----
 drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c | 32 ++++++-------
 drivers/gpu/drm/msm/msm_drv.c             | 56 ++++++++++++-----------
 drivers/gpu/drm/msm/msm_kms.h             |  8 ++--
 4 files changed, 59 insertions(+), 62 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
index b466784d9822..131c1f1a869c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
@@ -111,7 +111,7 @@ static int _dpu_mdss_irq_domain_add(struct dpu_mdss *dpu_mdss)
 	struct device *dev;
 	struct irq_domain *domain;
 
-	dev = dpu_mdss->base.dev->dev;
+	dev = dpu_mdss->base.dev;
 
 	domain = irq_domain_add_linear(dev->of_node, 32,
 			&dpu_mdss_irqdomain_ops, dpu_mdss);
@@ -184,16 +184,15 @@ static int dpu_mdss_disable(struct msm_mdss *mdss)
 	return ret;
 }
 
-static void dpu_mdss_destroy(struct drm_device *dev)
+static void dpu_mdss_destroy(struct msm_mdss *mdss)
 {
-	struct platform_device *pdev = to_platform_device(dev->dev);
-	struct msm_drm_private *priv = dev->dev_private;
-	struct dpu_mdss *dpu_mdss = to_dpu_mdss(priv->mdss);
+	struct platform_device *pdev = to_platform_device(mdss->dev);
+	struct dpu_mdss *dpu_mdss = to_dpu_mdss(mdss);
 	struct dss_module_power *mp = &dpu_mdss->mp;
 	int irq;
 
-	pm_runtime_suspend(dev->dev);
-	pm_runtime_disable(dev->dev);
+	pm_runtime_suspend(mdss->dev);
+	pm_runtime_disable(mdss->dev);
 	_dpu_mdss_irq_domain_fini(dpu_mdss);
 	irq = platform_get_irq(pdev, 0);
 	irq_set_chained_handler_and_data(irq, NULL, NULL);
@@ -203,7 +202,6 @@ static void dpu_mdss_destroy(struct drm_device *dev)
 	if (dpu_mdss->mmio)
 		devm_iounmap(&pdev->dev, dpu_mdss->mmio);
 	dpu_mdss->mmio = NULL;
-	priv->mdss = NULL;
 }
 
 static const struct msm_mdss_funcs mdss_funcs = {
@@ -212,16 +210,15 @@ static const struct msm_mdss_funcs mdss_funcs = {
 	.destroy = dpu_mdss_destroy,
 };
 
-int dpu_mdss_init(struct drm_device *dev)
+int dpu_mdss_init(struct platform_device *pdev)
 {
-	struct platform_device *pdev = to_platform_device(dev->dev);
-	struct msm_drm_private *priv = dev->dev_private;
+	struct msm_drm_private *priv = platform_get_drvdata(pdev);
 	struct dpu_mdss *dpu_mdss;
 	struct dss_module_power *mp;
 	int ret;
 	int irq;
 
-	dpu_mdss = devm_kzalloc(dev->dev, sizeof(*dpu_mdss), GFP_KERNEL);
+	dpu_mdss = devm_kzalloc(&pdev->dev, sizeof(*dpu_mdss), GFP_KERNEL);
 	if (!dpu_mdss)
 		return -ENOMEM;
 
@@ -238,7 +235,7 @@ int dpu_mdss_init(struct drm_device *dev)
 		goto clk_parse_err;
 	}
 
-	dpu_mdss->base.dev = dev;
+	dpu_mdss->base.dev = &pdev->dev;
 	dpu_mdss->base.funcs = &mdss_funcs;
 
 	ret = _dpu_mdss_irq_domain_add(dpu_mdss);
@@ -256,7 +253,7 @@ int dpu_mdss_init(struct drm_device *dev)
 
 	priv->mdss = &dpu_mdss->base;
 
-	pm_runtime_enable(dev->dev);
+	pm_runtime_enable(&pdev->dev);
 
 	return 0;
 
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c
index c34760d981b8..b3f79c2277e9 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c
@@ -112,7 +112,7 @@ static const struct irq_domain_ops mdss_hw_irqdomain_ops = {
 
 static int mdss_irq_domain_init(struct mdp5_mdss *mdp5_mdss)
 {
-	struct device *dev = mdp5_mdss->base.dev->dev;
+	struct device *dev = mdp5_mdss->base.dev;
 	struct irq_domain *d;
 
 	d = irq_domain_add_linear(dev->of_node, 32, &mdss_hw_irqdomain_ops,
@@ -155,7 +155,7 @@ static int mdp5_mdss_disable(struct msm_mdss *mdss)
 static int msm_mdss_get_clocks(struct mdp5_mdss *mdp5_mdss)
 {
 	struct platform_device *pdev =
-			to_platform_device(mdp5_mdss->base.dev->dev);
+			to_platform_device(mdp5_mdss->base.dev);
 
 	mdp5_mdss->ahb_clk = msm_clk_get(pdev, "iface");
 	if (IS_ERR(mdp5_mdss->ahb_clk))
@@ -172,10 +172,9 @@ static int msm_mdss_get_clocks(struct mdp5_mdss *mdp5_mdss)
 	return 0;
 }
 
-static void mdp5_mdss_destroy(struct drm_device *dev)
+static void mdp5_mdss_destroy(struct msm_mdss *mdss)
 {
-	struct msm_drm_private *priv = dev->dev_private;
-	struct mdp5_mdss *mdp5_mdss = to_mdp5_mdss(priv->mdss);
+	struct mdp5_mdss *mdp5_mdss = to_mdp5_mdss(mdss);
 
 	if (!mdp5_mdss)
 		return;
@@ -183,7 +182,7 @@ static void mdp5_mdss_destroy(struct drm_device *dev)
 	irq_domain_remove(mdp5_mdss->irqcontroller.domain);
 	mdp5_mdss->irqcontroller.domain = NULL;
 
-	pm_runtime_disable(dev->dev);
+	pm_runtime_disable(mdss->dev);
 }
 
 static const struct msm_mdss_funcs mdss_funcs = {
@@ -192,25 +191,24 @@ static const struct msm_mdss_funcs mdss_funcs = {
 	.destroy = mdp5_mdss_destroy,
 };
 
-int mdp5_mdss_init(struct drm_device *dev)
+int mdp5_mdss_init(struct platform_device *pdev)
 {
-	struct platform_device *pdev = to_platform_device(dev->dev);
-	struct msm_drm_private *priv = dev->dev_private;
+	struct msm_drm_private *priv = platform_get_drvdata(pdev);
 	struct mdp5_mdss *mdp5_mdss;
 	int ret;
 
 	DBG("");
 
-	if (!of_device_is_compatible(dev->dev->of_node, "qcom,mdss"))
+	if (!of_device_is_compatible(pdev->dev.of_node, "qcom,mdss"))
 		return 0;
 
-	mdp5_mdss = devm_kzalloc(dev->dev, sizeof(*mdp5_mdss), GFP_KERNEL);
+	mdp5_mdss = devm_kzalloc(&pdev->dev, sizeof(*mdp5_mdss), GFP_KERNEL);
 	if (!mdp5_mdss) {
 		ret = -ENOMEM;
 		goto fail;
 	}
 
-	mdp5_mdss->base.dev = dev;
+	mdp5_mdss->base.dev = &pdev->dev;
 
 	mdp5_mdss->mmio = msm_ioremap(pdev, "mdss_phys", "MDSS");
 	if (IS_ERR(mdp5_mdss->mmio)) {
@@ -226,27 +224,27 @@ int mdp5_mdss_init(struct drm_device *dev)
 
 	ret = msm_mdss_get_clocks(mdp5_mdss);
 	if (ret) {
-		DRM_DEV_ERROR(dev->dev, "failed to get clocks: %d\n", ret);
+		DRM_DEV_ERROR(&pdev->dev, "failed to get clocks: %d\n", ret);
 		goto fail;
 	}
 
-	ret = devm_request_irq(dev->dev, platform_get_irq(pdev, 0),
+	ret = devm_request_irq(&pdev->dev, platform_get_irq(pdev, 0),
 			       mdss_irq, 0, "mdss_isr", mdp5_mdss);
 	if (ret) {
-		DRM_DEV_ERROR(dev->dev, "failed to init irq: %d\n", ret);
+		DRM_DEV_ERROR(&pdev->dev, "failed to init irq: %d\n", ret);
 		goto fail;
 	}
 
 	ret = mdss_irq_domain_init(mdp5_mdss);
 	if (ret) {
-		DRM_DEV_ERROR(dev->dev, "failed to init sub-block irqs: %d\n", ret);
+		DRM_DEV_ERROR(&pdev->dev, "failed to init sub-block irqs: %d\n", ret);
 		goto fail;
 	}
 
 	mdp5_mdss->base.funcs = &mdss_funcs;
 	priv->mdss = &mdp5_mdss->base;
 
-	pm_runtime_enable(dev->dev);
+	pm_runtime_enable(&pdev->dev);
 
 	return 0;
 fail:
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index f5596efd3819..ad35a5d94053 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -342,7 +342,6 @@ static int msm_drm_uninit(struct device *dev)
 	struct msm_drm_private *priv = platform_get_drvdata(pdev);
 	struct drm_device *ddev = priv->dev;
 	struct msm_kms *kms = priv->kms;
-	struct msm_mdss *mdss = priv->mdss;
 	int i;
 
 	/*
@@ -402,9 +401,6 @@ static int msm_drm_uninit(struct device *dev)
 
 	component_unbind_all(dev, ddev);
 
-	if (mdss && mdss->funcs)
-		mdss->funcs->destroy(ddev);
-
 	ddev->dev_private = NULL;
 	drm_dev_put(ddev);
 
@@ -525,20 +521,6 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 	ddev->dev_private = priv;
 	priv->dev = ddev;
 
-	switch (get_mdp_ver(pdev)) {
-	case KMS_MDP5:
-		ret = mdp5_mdss_init(ddev);
-		break;
-	case KMS_DPU:
-		ret = dpu_mdss_init(ddev);
-		break;
-	default:
-		ret = 0;
-		break;
-	}
-	if (ret)
-		goto err_put_drm_dev;
-
 	mdss = priv->mdss;
 
 	priv->wq = alloc_ordered_workqueue("msm", 0);
@@ -561,12 +543,12 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 
 	ret = msm_init_vram(ddev);
 	if (ret)
-		goto err_destroy_mdss;
+		return ret;
 
 	/* Bind all our sub-components: */
 	ret = component_bind_all(dev, ddev);
 	if (ret)
-		goto err_destroy_mdss;
+		return ret;
 
 	dma_set_max_seg_size(dev, UINT_MAX);
 
@@ -672,12 +654,6 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 err_msm_uninit:
 	msm_drm_uninit(dev);
 	return ret;
-err_destroy_mdss:
-	if (mdss && mdss->funcs)
-		mdss->funcs->destroy(ddev);
-err_put_drm_dev:
-	drm_dev_put(ddev);
-	return ret;
 }
 
 /*
@@ -1386,10 +1362,26 @@ static int msm_pdev_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, priv);
 
+	switch (get_mdp_ver(pdev)) {
+	case KMS_MDP5:
+		ret = mdp5_mdss_init(pdev);
+		break;
+	case KMS_DPU:
+		ret = dpu_mdss_init(pdev);
+		break;
+	default:
+		ret = 0;
+		break;
+	}
+	if (ret) {
+		platform_set_drvdata(pdev, NULL);
+		return ret;
+	}
+
 	if (get_mdp_ver(pdev)) {
 		ret = add_display_components(pdev, &match);
 		if (ret)
-			return ret;
+			goto fail;
 	}
 
 	ret = add_gpu_components(&pdev->dev, &match);
@@ -1411,14 +1403,24 @@ static int msm_pdev_probe(struct platform_device *pdev)
 
 fail:
 	of_platform_depopulate(&pdev->dev);
+
+	if (priv->mdss && priv->mdss->funcs)
+		priv->mdss->funcs->destroy(priv->mdss);
+
 	return ret;
 }
 
 static int msm_pdev_remove(struct platform_device *pdev)
 {
+	struct msm_drm_private *priv = platform_get_drvdata(pdev);
+	struct msm_mdss *mdss = priv->mdss;
+
 	component_master_del(&pdev->dev, &msm_drm_ops);
 	of_platform_depopulate(&pdev->dev);
 
+	if (mdss && mdss->funcs)
+		mdss->funcs->destroy(mdss);
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/msm/msm_kms.h b/drivers/gpu/drm/msm/msm_kms.h
index 8b132c8b1513..2a4f0526cb98 100644
--- a/drivers/gpu/drm/msm/msm_kms.h
+++ b/drivers/gpu/drm/msm/msm_kms.h
@@ -204,16 +204,16 @@ extern const struct of_device_id mdp5_dt_match[];
 struct msm_mdss_funcs {
 	int (*enable)(struct msm_mdss *mdss);
 	int (*disable)(struct msm_mdss *mdss);
-	void (*destroy)(struct drm_device *dev);
+	void (*destroy)(struct msm_mdss *mdss);
 };
 
 struct msm_mdss {
-	struct drm_device *dev;
+	struct device *dev;
 	const struct msm_mdss_funcs *funcs;
 };
 
-int mdp5_mdss_init(struct drm_device *dev);
-int dpu_mdss_init(struct drm_device *dev);
+int mdp5_mdss_init(struct platform_device *dev);
+int dpu_mdss_init(struct platform_device *dev);
 
 #define for_each_crtc_mask(dev, crtc, crtc_mask) \
 	drm_for_each_crtc(crtc, dev) \
-- 
2.33.0

[PATCH] drm/msm: Initialize MDSS irq domain at probe time

[Dmitry Baryshkov]

Since commit 8f59ee9a570c ("drm/msm/dsi: Adjust probe order"), the
DSI host gets initialized earlier, but this caused unability to probe
the entire stack of components because they all depend on interrupts
coming from the main `mdss` node (mdp5, or dpu1).

To fix this issue, move mdss device initialization (which include irq
domain setup) to msm_mdev_probe() time, as to make sure that the
interrupt controller is available before dsi and/or other components try
to initialize, finally satisfying the dependency.

Fixes: 8f59ee9a570c ("drm/msm/dsi: Adjust probe order")
Co-Developed-By: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---

When checking your patch, I noticed that IRQ domain is created before
respective MDSS clocks are enabled. This does not look like causing any
issues at this time, but it did not look good. So I started moving
clocks parsing to early_init() callbacks. And at some point it looked
like we can drop the init()/destroy() callbacks in favour of
early_init() and remove(). Which promted me to move init()/destroy() in
place of early_init()/remove() with few minor fixes here and there.

---
 drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c  | 25 +++++-----
 drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c | 32 ++++++-------
 drivers/gpu/drm/msm/msm_drv.c             | 56 ++++++++++++-----------
 drivers/gpu/drm/msm/msm_kms.h             |  8 ++--
 4 files changed, 59 insertions(+), 62 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
index b466784d9822..131c1f1a869c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
@@ -111,7 +111,7 @@ static int _dpu_mdss_irq_domain_add(struct dpu_mdss *dpu_mdss)
 	struct device *dev;
 	struct irq_domain *domain;
 
-	dev = dpu_mdss->base.dev->dev;
+	dev = dpu_mdss->base.dev;
 
 	domain = irq_domain_add_linear(dev->of_node, 32,
 			&dpu_mdss_irqdomain_ops, dpu_mdss);
@@ -184,16 +184,15 @@ static int dpu_mdss_disable(struct msm_mdss *mdss)
 	return ret;
 }
 
-static void dpu_mdss_destroy(struct drm_device *dev)
+static void dpu_mdss_destroy(struct msm_mdss *mdss)
 {
-	struct platform_device *pdev = to_platform_device(dev->dev);
-	struct msm_drm_private *priv = dev->dev_private;
-	struct dpu_mdss *dpu_mdss = to_dpu_mdss(priv->mdss);
+	struct platform_device *pdev = to_platform_device(mdss->dev);
+	struct dpu_mdss *dpu_mdss = to_dpu_mdss(mdss);
 	struct dss_module_power *mp = &dpu_mdss->mp;
 	int irq;
 
-	pm_runtime_suspend(dev->dev);
-	pm_runtime_disable(dev->dev);
+	pm_runtime_suspend(mdss->dev);
+	pm_runtime_disable(mdss->dev);
 	_dpu_mdss_irq_domain_fini(dpu_mdss);
 	irq = platform_get_irq(pdev, 0);
 	irq_set_chained_handler_and_data(irq, NULL, NULL);
@@ -203,7 +202,6 @@ static void dpu_mdss_destroy(struct drm_device *dev)
 	if (dpu_mdss->mmio)
 		devm_iounmap(&pdev->dev, dpu_mdss->mmio);
 	dpu_mdss->mmio = NULL;
-	priv->mdss = NULL;
 }
 
 static const struct msm_mdss_funcs mdss_funcs = {
@@ -212,16 +210,15 @@ static const struct msm_mdss_funcs mdss_funcs = {
 	.destroy = dpu_mdss_destroy,
 };
 
-int dpu_mdss_init(struct drm_device *dev)
+int dpu_mdss_init(struct platform_device *pdev)
 {
-	struct platform_device *pdev = to_platform_device(dev->dev);
-	struct msm_drm_private *priv = dev->dev_private;
+	struct msm_drm_private *priv = platform_get_drvdata(pdev);
 	struct dpu_mdss *dpu_mdss;
 	struct dss_module_power *mp;
 	int ret;
 	int irq;
 
-	dpu_mdss = devm_kzalloc(dev->dev, sizeof(*dpu_mdss), GFP_KERNEL);
+	dpu_mdss = devm_kzalloc(&pdev->dev, sizeof(*dpu_mdss), GFP_KERNEL);
 	if (!dpu_mdss)
 		return -ENOMEM;
 
@@ -238,7 +235,7 @@ int dpu_mdss_init(struct drm_device *dev)
 		goto clk_parse_err;
 	}
 
-	dpu_mdss->base.dev = dev;
+	dpu_mdss->base.dev = &pdev->dev;
 	dpu_mdss->base.funcs = &mdss_funcs;
 
 	ret = _dpu_mdss_irq_domain_add(dpu_mdss);
@@ -256,7 +253,7 @@ int dpu_mdss_init(struct drm_device *dev)
 
 	priv->mdss = &dpu_mdss->base;
 
-	pm_runtime_enable(dev->dev);
+	pm_runtime_enable(&pdev->dev);
 
 	return 0;
 
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c
index c34760d981b8..b3f79c2277e9 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c
@@ -112,7 +112,7 @@ static const struct irq_domain_ops mdss_hw_irqdomain_ops = {
 
 static int mdss_irq_domain_init(struct mdp5_mdss *mdp5_mdss)
 {
-	struct device *dev = mdp5_mdss->base.dev->dev;
+	struct device *dev = mdp5_mdss->base.dev;
 	struct irq_domain *d;
 
 	d = irq_domain_add_linear(dev->of_node, 32, &mdss_hw_irqdomain_ops,
@@ -155,7 +155,7 @@ static int mdp5_mdss_disable(struct msm_mdss *mdss)
 static int msm_mdss_get_clocks(struct mdp5_mdss *mdp5_mdss)
 {
 	struct platform_device *pdev =
-			to_platform_device(mdp5_mdss->base.dev->dev);
+			to_platform_device(mdp5_mdss->base.dev);
 
 	mdp5_mdss->ahb_clk = msm_clk_get(pdev, "iface");
 	if (IS_ERR(mdp5_mdss->ahb_clk))
@@ -172,10 +172,9 @@ static int msm_mdss_get_clocks(struct mdp5_mdss *mdp5_mdss)
 	return 0;
 }
 
-static void mdp5_mdss_destroy(struct drm_device *dev)
+static void mdp5_mdss_destroy(struct msm_mdss *mdss)
 {
-	struct msm_drm_private *priv = dev->dev_private;
-	struct mdp5_mdss *mdp5_mdss = to_mdp5_mdss(priv->mdss);
+	struct mdp5_mdss *mdp5_mdss = to_mdp5_mdss(mdss);
 
 	if (!mdp5_mdss)
 		return;
@@ -183,7 +182,7 @@ static void mdp5_mdss_destroy(struct drm_device *dev)
 	irq_domain_remove(mdp5_mdss->irqcontroller.domain);
 	mdp5_mdss->irqcontroller.domain = NULL;
 
-	pm_runtime_disable(dev->dev);
+	pm_runtime_disable(mdss->dev);
 }
 
 static const struct msm_mdss_funcs mdss_funcs = {
@@ -192,25 +191,24 @@ static const struct msm_mdss_funcs mdss_funcs = {
 	.destroy = mdp5_mdss_destroy,
 };
 
-int mdp5_mdss_init(struct drm_device *dev)
+int mdp5_mdss_init(struct platform_device *pdev)
 {
-	struct platform_device *pdev = to_platform_device(dev->dev);
-	struct msm_drm_private *priv = dev->dev_private;
+	struct msm_drm_private *priv = platform_get_drvdata(pdev);
 	struct mdp5_mdss *mdp5_mdss;
 	int ret;
 
 	DBG("");
 
-	if (!of_device_is_compatible(dev->dev->of_node, "qcom,mdss"))
+	if (!of_device_is_compatible(pdev->dev.of_node, "qcom,mdss"))
 		return 0;
 
-	mdp5_mdss = devm_kzalloc(dev->dev, sizeof(*mdp5_mdss), GFP_KERNEL);
+	mdp5_mdss = devm_kzalloc(&pdev->dev, sizeof(*mdp5_mdss), GFP_KERNEL);
 	if (!mdp5_mdss) {
 		ret = -ENOMEM;
 		goto fail;
 	}
 
-	mdp5_mdss->base.dev = dev;
+	mdp5_mdss->base.dev = &pdev->dev;
 
 	mdp5_mdss->mmio = msm_ioremap(pdev, "mdss_phys", "MDSS");
 	if (IS_ERR(mdp5_mdss->mmio)) {
@@ -226,27 +224,27 @@ int mdp5_mdss_init(struct drm_device *dev)
 
 	ret = msm_mdss_get_clocks(mdp5_mdss);
 	if (ret) {
-		DRM_DEV_ERROR(dev->dev, "failed to get clocks: %d\n", ret);
+		DRM_DEV_ERROR(&pdev->dev, "failed to get clocks: %d\n", ret);
 		goto fail;
 	}
 
-	ret = devm_request_irq(dev->dev, platform_get_irq(pdev, 0),
+	ret = devm_request_irq(&pdev->dev, platform_get_irq(pdev, 0),
 			       mdss_irq, 0, "mdss_isr", mdp5_mdss);
 	if (ret) {
-		DRM_DEV_ERROR(dev->dev, "failed to init irq: %d\n", ret);
+		DRM_DEV_ERROR(&pdev->dev, "failed to init irq: %d\n", ret);
 		goto fail;
 	}
 
 	ret = mdss_irq_domain_init(mdp5_mdss);
 	if (ret) {
-		DRM_DEV_ERROR(dev->dev, "failed to init sub-block irqs: %d\n", ret);
+		DRM_DEV_ERROR(&pdev->dev, "failed to init sub-block irqs: %d\n", ret);
 		goto fail;
 	}
 
 	mdp5_mdss->base.funcs = &mdss_funcs;
 	priv->mdss = &mdp5_mdss->base;
 
-	pm_runtime_enable(dev->dev);
+	pm_runtime_enable(&pdev->dev);
 
 	return 0;
 fail:
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index f5596efd3819..ad35a5d94053 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -342,7 +342,6 @@ static int msm_drm_uninit(struct device *dev)
 	struct msm_drm_private *priv = platform_get_drvdata(pdev);
 	struct drm_device *ddev = priv->dev;
 	struct msm_kms *kms = priv->kms;
-	struct msm_mdss *mdss = priv->mdss;
 	int i;
 
 	/*
@@ -402,9 +401,6 @@ static int msm_drm_uninit(struct device *dev)
 
 	component_unbind_all(dev, ddev);
 
-	if (mdss && mdss->funcs)
-		mdss->funcs->destroy(ddev);
-
 	ddev->dev_private = NULL;
 	drm_dev_put(ddev);
 
@@ -525,20 +521,6 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 	ddev->dev_private = priv;
 	priv->dev = ddev;
 
-	switch (get_mdp_ver(pdev)) {
-	case KMS_MDP5:
-		ret = mdp5_mdss_init(ddev);
-		break;
-	case KMS_DPU:
-		ret = dpu_mdss_init(ddev);
-		break;
-	default:
-		ret = 0;
-		break;
-	}
-	if (ret)
-		goto err_put_drm_dev;
-
 	mdss = priv->mdss;
 
 	priv->wq = alloc_ordered_workqueue("msm", 0);
@@ -561,12 +543,12 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 
 	ret = msm_init_vram(ddev);
 	if (ret)
-		goto err_destroy_mdss;
+		return ret;
 
 	/* Bind all our sub-components: */
 	ret = component_bind_all(dev, ddev);
 	if (ret)
-		goto err_destroy_mdss;
+		return ret;
 
 	dma_set_max_seg_size(dev, UINT_MAX);
 
@@ -672,12 +654,6 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 err_msm_uninit:
 	msm_drm_uninit(dev);
 	return ret;
-err_destroy_mdss:
-	if (mdss && mdss->funcs)
-		mdss->funcs->destroy(ddev);
-err_put_drm_dev:
-	drm_dev_put(ddev);
-	return ret;
 }
 
 /*
@@ -1386,10 +1362,26 @@ static int msm_pdev_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, priv);
 
+	switch (get_mdp_ver(pdev)) {
+	case KMS_MDP5:
+		ret = mdp5_mdss_init(pdev);
+		break;
+	case KMS_DPU:
+		ret = dpu_mdss_init(pdev);
+		break;
+	default:
+		ret = 0;
+		break;
+	}
+	if (ret) {
+		platform_set_drvdata(pdev, NULL);
+		return ret;
+	}
+
 	if (get_mdp_ver(pdev)) {
 		ret = add_display_components(pdev, &match);
 		if (ret)
-			return ret;
+			goto fail;
 	}
 
 	ret = add_gpu_components(&pdev->dev, &match);
@@ -1411,14 +1403,24 @@ static int msm_pdev_probe(struct platform_device *pdev)
 
 fail:
 	of_platform_depopulate(&pdev->dev);
+
+	if (priv->mdss && priv->mdss->funcs)
+		priv->mdss->funcs->destroy(priv->mdss);
+
 	return ret;
 }
 
 static int msm_pdev_remove(struct platform_device *pdev)
 {
+	struct msm_drm_private *priv = platform_get_drvdata(pdev);
+	struct msm_mdss *mdss = priv->mdss;
+
 	component_master_del(&pdev->dev, &msm_drm_ops);
 	of_platform_depopulate(&pdev->dev);
 
+	if (mdss && mdss->funcs)
+		mdss->funcs->destroy(mdss);
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/msm/msm_kms.h b/drivers/gpu/drm/msm/msm_kms.h
index 8b132c8b1513..2a4f0526cb98 100644
--- a/drivers/gpu/drm/msm/msm_kms.h
+++ b/drivers/gpu/drm/msm/msm_kms.h
@@ -204,16 +204,16 @@ extern const struct of_device_id mdp5_dt_match[];
 struct msm_mdss_funcs {
 	int (*enable)(struct msm_mdss *mdss);
 	int (*disable)(struct msm_mdss *mdss);
-	void (*destroy)(struct drm_device *dev);
+	void (*destroy)(struct msm_mdss *mdss);
 };
 
 struct msm_mdss {
-	struct drm_device *dev;
+	struct device *dev;
 	const struct msm_mdss_funcs *funcs;
 };
 
-int mdp5_mdss_init(struct drm_device *dev);
-int dpu_mdss_init(struct drm_device *dev);
+int mdp5_mdss_init(struct platform_device *dev);
+int dpu_mdss_init(struct platform_device *dev);
 
 #define for_each_crtc_mask(dev, crtc, crtc_mask) \
 	drm_for_each_crtc(crtc, dev) \
-- 
2.33.0

Re: [PATCH] drm/msm: Initialize MDSS irq domain at probe time

[AngeloGioacchino Del Regno]

Il 01/12/21 21:20, Dmitry Baryshkov ha scritto:
> Since commit 8f59ee9a570c ("drm/msm/dsi: Adjust probe order"), the
> DSI host gets initialized earlier, but this caused unability to probe
> the entire stack of components because they all depend on interrupts
> coming from the main `mdss` node (mdp5, or dpu1).
> 
> To fix this issue, move mdss device initialization (which include irq
> domain setup) to msm_mdev_probe() time, as to make sure that the
> interrupt controller is available before dsi and/or other components try
> to initialize, finally satisfying the dependency.
> 
> Fixes: 8f59ee9a570c ("drm/msm/dsi: Adjust probe order")
> Co-Developed-By: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
> 
> When checking your patch, I noticed that IRQ domain is created before
> respective MDSS clocks are enabled. This does not look like causing any
> issues at this time, but it did not look good. So I started moving
> clocks parsing to early_init() callbacks. And at some point it looked
> like we can drop the init()/destroy() callbacks in favour of
> early_init() and remove(). Which promted me to move init()/destroy() in
> place of early_init()/remove() with few minor fixes here and there.
> 


Hey Dmitry,
I wanted to make the least amount of changes to Rob's logic... I know that
the clocks aren't up before registering the domain, but my logic was implying
that if the handlers aren't registered, then there's no interrupt coming, hence
no risk of getting issues. Same if the hardware is down, you can't get any
interrupt, because it can't generate any (but if bootloader leaves it up.. eh.)

I recognize that such approach is "fragile enough", lastly, I agree with this
patch which is, in the end, something that is in the middle between my first
and last approach.

I've tested this one on trogdor-lazor-limozeen and seems to be working in an
analogous way to my v2/v3, so on my side it's validated.


Let's go for this one!
How do we proceeed now? Are you sending a new series with the new patches, or
should I?

Also, I don't think this is relevant, since I'm in co-dev, but in case it is:
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

P.S.: Sorry for the 1-day delay, got busy with other tasks!

Re: [PATCH] drm/msm: Initialize MDSS irq domain at probe time

[AngeloGioacchino Del Regno]

Il 01/12/21 21:20, Dmitry Baryshkov ha scritto:
> Since commit 8f59ee9a570c ("drm/msm/dsi: Adjust probe order"), the
> DSI host gets initialized earlier, but this caused unability to probe
> the entire stack of components because they all depend on interrupts
> coming from the main `mdss` node (mdp5, or dpu1).
> 
> To fix this issue, move mdss device initialization (which include irq
> domain setup) to msm_mdev_probe() time, as to make sure that the
> interrupt controller is available before dsi and/or other components try
> to initialize, finally satisfying the dependency.
> 
> Fixes: 8f59ee9a570c ("drm/msm/dsi: Adjust probe order")
> Co-Developed-By: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
> 
> When checking your patch, I noticed that IRQ domain is created before
> respective MDSS clocks are enabled. This does not look like causing any
> issues at this time, but it did not look good. So I started moving
> clocks parsing to early_init() callbacks. And at some point it looked
> like we can drop the init()/destroy() callbacks in favour of
> early_init() and remove(). Which promted me to move init()/destroy() in
> place of early_init()/remove() with few minor fixes here and there.
> 


Hey Dmitry,
I wanted to make the least amount of changes to Rob's logic... I know that
the clocks aren't up before registering the domain, but my logic was implying
that if the handlers aren't registered, then there's no interrupt coming, hence
no risk of getting issues. Same if the hardware is down, you can't get any
interrupt, because it can't generate any (but if bootloader leaves it up.. eh.)

I recognize that such approach is "fragile enough", lastly, I agree with this
patch which is, in the end, something that is in the middle between my first
and last approach.

I've tested this one on trogdor-lazor-limozeen and seems to be working in an
analogous way to my v2/v3, so on my side it's validated.


Let's go for this one!
How do we proceeed now? Are you sending a new series with the new patches, or
should I?

Also, I don't think this is relevant, since I'm in co-dev, but in case it is:
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

P.S.: Sorry for the 1-day delay, got busy with other tasks!

Re: [PATCH] drm/msm: Initialize MDSS irq domain at probe time

[Dmitry Baryshkov]

On 03/12/2021 13:43, AngeloGioacchino Del Regno wrote:
> Il 01/12/21 21:20, Dmitry Baryshkov ha scritto:
>> Since commit 8f59ee9a570c ("drm/msm/dsi: Adjust probe order"), the
>> DSI host gets initialized earlier, but this caused unability to probe
>> the entire stack of components because they all depend on interrupts
>> coming from the main `mdss` node (mdp5, or dpu1).
>>
>> To fix this issue, move mdss device initialization (which include irq
>> domain setup) to msm_mdev_probe() time, as to make sure that the
>> interrupt controller is available before dsi and/or other components try
>> to initialize, finally satisfying the dependency.
>>
>> Fixes: 8f59ee9a570c ("drm/msm/dsi: Adjust probe order")
>> Co-Developed-By: AngeloGioacchino Del Regno 
>> <angelogioacchino.delregno@collabora.com>
>> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
>> ---
>>
>> When checking your patch, I noticed that IRQ domain is created before
>> respective MDSS clocks are enabled. This does not look like causing any
>> issues at this time, but it did not look good. So I started moving
>> clocks parsing to early_init() callbacks. And at some point it looked
>> like we can drop the init()/destroy() callbacks in favour of
>> early_init() and remove(). Which promted me to move init()/destroy() in
>> place of early_init()/remove() with few minor fixes here and there.
>>
> 
> 
> Hey Dmitry,
> I wanted to make the least amount of changes to Rob's logic... I know that
> the clocks aren't up before registering the domain, but my logic was 
> implying
> that if the handlers aren't registered, then there's no interrupt 
> coming, hence
> no risk of getting issues. Same if the hardware is down, you can't get any
> interrupt, because it can't generate any (but if bootloader leaves it 
> up.. eh.)

We can get spurious interrupts for any reason, which puts us at risk of 
peeking into unpowered registers. So, while your approach was working, 
it did not seem fully correct.

> 
> I recognize that such approach is "fragile enough", lastly, I agree with 
> this
> patch which is, in the end, something that is in the middle between my 
> first
> and last approach.
> 
> I've tested this one on trogdor-lazor-limozeen and seems to be working 
> in an
> analogous way to my v2/v3, so on my side it's validated.
> 
> 
> Let's go for this one!
> How do we proceeed now? Are you sending a new series with the new 
> patches, or
> should I?

I'll run a few more tests and then I'll probably include both patches 
into the next series to be sent to Rob.

> 
> Also, I don't think this is relevant, since I'm in co-dev, but in case 
> it is:
> Tested-by: AngeloGioacchino Del Regno 
> <angelogioacchino.delregno@collabora.com>
> 
> P.S.: Sorry for the 1-day delay, got busy with other tasks!

No problem, it was just single day, no worries.

-- 
With best wishes
Dmitry

Re: [PATCH] drm/msm: Initialize MDSS irq domain at probe time

[Dmitry Baryshkov]

On 03/12/2021 13:43, AngeloGioacchino Del Regno wrote:
> Il 01/12/21 21:20, Dmitry Baryshkov ha scritto:
>> Since commit 8f59ee9a570c ("drm/msm/dsi: Adjust probe order"), the
>> DSI host gets initialized earlier, but this caused unability to probe
>> the entire stack of components because they all depend on interrupts
>> coming from the main `mdss` node (mdp5, or dpu1).
>>
>> To fix this issue, move mdss device initialization (which include irq
>> domain setup) to msm_mdev_probe() time, as to make sure that the
>> interrupt controller is available before dsi and/or other components try
>> to initialize, finally satisfying the dependency.
>>
>> Fixes: 8f59ee9a570c ("drm/msm/dsi: Adjust probe order")
>> Co-Developed-By: AngeloGioacchino Del Regno 
>> <angelogioacchino.delregno@collabora.com>
>> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
>> ---
>>
>> When checking your patch, I noticed that IRQ domain is created before
>> respective MDSS clocks are enabled. This does not look like causing any
>> issues at this time, but it did not look good. So I started moving
>> clocks parsing to early_init() callbacks. And at some point it looked
>> like we can drop the init()/destroy() callbacks in favour of
>> early_init() and remove(). Which promted me to move init()/destroy() in
>> place of early_init()/remove() with few minor fixes here and there.
>>
> 
> 
> Hey Dmitry,
> I wanted to make the least amount of changes to Rob's logic... I know that
> the clocks aren't up before registering the domain, but my logic was 
> implying
> that if the handlers aren't registered, then there's no interrupt 
> coming, hence
> no risk of getting issues. Same if the hardware is down, you can't get any
> interrupt, because it can't generate any (but if bootloader leaves it 
> up.. eh.)

We can get spurious interrupts for any reason, which puts us at risk of 
peeking into unpowered registers. So, while your approach was working, 
it did not seem fully correct.

> 
> I recognize that such approach is "fragile enough", lastly, I agree with 
> this
> patch which is, in the end, something that is in the middle between my 
> first
> and last approach.
> 
> I've tested this one on trogdor-lazor-limozeen and seems to be working 
> in an
> analogous way to my v2/v3, so on my side it's validated.
> 
> 
> Let's go for this one!
> How do we proceeed now? Are you sending a new series with the new 
> patches, or
> should I?

I'll run a few more tests and then I'll probably include both patches 
into the next series to be sent to Rob.

> 
> Also, I don't think this is relevant, since I'm in co-dev, but in case 
> it is:
> Tested-by: AngeloGioacchino Del Regno 
> <angelogioacchino.delregno@collabora.com>
> 
> P.S.: Sorry for the 1-day delay, got busy with other tasks!

No problem, it was just single day, no worries.

-- 
With best wishes
Dmitry

Re: [PATCH] drm/msm: Initialize MDSS irq domain at probe time

[AngeloGioacchino Del Regno]

Il 03/12/21 14:14, Dmitry Baryshkov ha scritto:
> On 03/12/2021 13:43, AngeloGioacchino Del Regno wrote:
>> Il 01/12/21 21:20, Dmitry Baryshkov ha scritto:
>>> Since commit 8f59ee9a570c ("drm/msm/dsi: Adjust probe order"), the
>>> DSI host gets initialized earlier, but this caused unability to probe
>>> the entire stack of components because they all depend on interrupts
>>> coming from the main `mdss` node (mdp5, or dpu1).
>>>
>>> To fix this issue, move mdss device initialization (which include irq
>>> domain setup) to msm_mdev_probe() time, as to make sure that the
>>> interrupt controller is available before dsi and/or other components try
>>> to initialize, finally satisfying the dependency.
>>>
>>> Fixes: 8f59ee9a570c ("drm/msm/dsi: Adjust probe order")
>>> Co-Developed-By: AngeloGioacchino Del Regno 
>>> <angelogioacchino.delregno@collabora.com>
>>> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
>>> ---
>>>
>>> When checking your patch, I noticed that IRQ domain is created before
>>> respective MDSS clocks are enabled. This does not look like causing any
>>> issues at this time, but it did not look good. So I started moving
>>> clocks parsing to early_init() callbacks. And at some point it looked
>>> like we can drop the init()/destroy() callbacks in favour of
>>> early_init() and remove(). Which promted me to move init()/destroy() in
>>> place of early_init()/remove() with few minor fixes here and there.
>>>
>>
>>
>> Hey Dmitry,
>> I wanted to make the least amount of changes to Rob's logic... I know that
>> the clocks aren't up before registering the domain, but my logic was implying
>> that if the handlers aren't registered, then there's no interrupt coming, hence
>> no risk of getting issues. Same if the hardware is down, you can't get any
>> interrupt, because it can't generate any (but if bootloader leaves it up.. eh.)
> 
> We can get spurious interrupts for any reason, which puts us at risk of peeking 
> into unpowered registers. So, while your approach was working, it did not seem 
> fully correct.
> 

Yeah, that's right and I totally agree.

>>
>> I recognize that such approach is "fragile enough", lastly, I agree with this
>> patch which is, in the end, something that is in the middle between my first
>> and last approach.
>>
>> I've tested this one on trogdor-lazor-limozeen and seems to be working in an
>> analogous way to my v2/v3, so on my side it's validated.
>>
>>
>> Let's go for this one!
>> How do we proceeed now? Are you sending a new series with the new patches, or
>> should I?
> 
> I'll run a few more tests and then I'll probably include both patches into the next 
> series to be sent to Rob.
> 

That's perfect!

>>
>> Also, I don't think this is relevant, since I'm in co-dev, but in case it is:
>> Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
>>
>> P.S.: Sorry for the 1-day delay, got busy with other tasks!
> 
> No problem, it was just single day, no worries.
> 

Alright, thank you! :D

Re: [PATCH] drm/msm: Initialize MDSS irq domain at probe time

[AngeloGioacchino Del Regno]

Il 03/12/21 14:14, Dmitry Baryshkov ha scritto:
> On 03/12/2021 13:43, AngeloGioacchino Del Regno wrote:
>> Il 01/12/21 21:20, Dmitry Baryshkov ha scritto:
>>> Since commit 8f59ee9a570c ("drm/msm/dsi: Adjust probe order"), the
>>> DSI host gets initialized earlier, but this caused unability to probe
>>> the entire stack of components because they all depend on interrupts
>>> coming from the main `mdss` node (mdp5, or dpu1).
>>>
>>> To fix this issue, move mdss device initialization (which include irq
>>> domain setup) to msm_mdev_probe() time, as to make sure that the
>>> interrupt controller is available before dsi and/or other components try
>>> to initialize, finally satisfying the dependency.
>>>
>>> Fixes: 8f59ee9a570c ("drm/msm/dsi: Adjust probe order")
>>> Co-Developed-By: AngeloGioacchino Del Regno 
>>> <angelogioacchino.delregno@collabora.com>
>>> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
>>> ---
>>>
>>> When checking your patch, I noticed that IRQ domain is created before
>>> respective MDSS clocks are enabled. This does not look like causing any
>>> issues at this time, but it did not look good. So I started moving
>>> clocks parsing to early_init() callbacks. And at some point it looked
>>> like we can drop the init()/destroy() callbacks in favour of
>>> early_init() and remove(). Which promted me to move init()/destroy() in
>>> place of early_init()/remove() with few minor fixes here and there.
>>>
>>
>>
>> Hey Dmitry,
>> I wanted to make the least amount of changes to Rob's logic... I know that
>> the clocks aren't up before registering the domain, but my logic was implying
>> that if the handlers aren't registered, then there's no interrupt coming, hence
>> no risk of getting issues. Same if the hardware is down, you can't get any
>> interrupt, because it can't generate any (but if bootloader leaves it up.. eh.)
> 
> We can get spurious interrupts for any reason, which puts us at risk of peeking 
> into unpowered registers. So, while your approach was working, it did not seem 
> fully correct.
> 

Yeah, that's right and I totally agree.

>>
>> I recognize that such approach is "fragile enough", lastly, I agree with this
>> patch which is, in the end, something that is in the middle between my first
>> and last approach.
>>
>> I've tested this one on trogdor-lazor-limozeen and seems to be working in an
>> analogous way to my v2/v3, so on my side it's validated.
>>
>>
>> Let's go for this one!
>> How do we proceeed now? Are you sending a new series with the new patches, or
>> should I?
> 
> I'll run a few more tests and then I'll probably include both patches into the next 
> series to be sent to Rob.
> 

That's perfect!

>>
>> Also, I don't think this is relevant, since I'm in co-dev, but in case it is:
>> Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
>>
>> P.S.: Sorry for the 1-day delay, got busy with other tasks!
> 
> No problem, it was just single day, no worries.
> 

Alright, thank you! :D