Linux-Media Archive on lore.kernel.org
 help / color / Atom feed
* [PATCH v6 0/8] drm: cec: convert DRM drivers to the new notifier API
@ 2019-08-13 11:02 Dariusz Marcinkiewicz
  2019-08-13 11:02 ` [PATCH v6 1/8] drm/i915/intel_hdmi: use cec_notifier_conn_(un)register Dariusz Marcinkiewicz
                   ` (7 more replies)
  0 siblings, 8 replies; 15+ messages in thread
From: Dariusz Marcinkiewicz @ 2019-08-13 11:02 UTC (permalink / raw)
  To: dri-devel, linux-media, hverkuil-cisco
  Cc: Dariusz Marcinkiewicz, Allison Randal, Andrzej Hajda,
	Chris Wilson, Colin Ian King, Daniel Vetter, Douglas Anderson,
	Enrico Weigelt, Hans Verkuil, Jani Nikula, Jernej Skrabec,
	Jonas Karlman, Kees Cook, Laurent Pinchart,
	moderated list:ARM/SAMSUNG EXYNOS ARM ARCHITECTURES, open list,
	moderated list:ARM/SAMSUNG EXYNOS ARM ARCHITECTURES,
	open list:DRM DRIVERS FOR NVIDIA TEGRA, Maarten Lankhorst,
	Neil Armstrong, Ramalingam C, Rodrigo Vivi, Russell King,
	Sam Ravnborg, Shashank Sharma, Thomas Gleixner,
	Ville Syrjälä

This series updates DRM drivers to use new CEC notifier API.

Only first two patches were tested on the actual hardware.

Changes since v5:
	Fixed a warning about a missing comment for a new member of
	drm_dp_aux_cec struct. Sending to a wider audience, including
	maintainers of respective drivers.
Changes since v4:
	Addressing review comments.
Changes since v3:
        Updated adapter flags in dw-hdmi-cec.
Changes since v2:
	Include all DRM patches from "cec: improve notifier support,
	add connector info connector info" series.
Changes since v1:
	Those patches delay creation of notifiers until respective
	connectors are constructed. It seems that those patches, for a
	couple of drivers, by adding the delay, introduce a race between
	notifiers' creation and the IRQs handling threads - at least I
	don't see anything obvious in there that would explicitly forbid
	such races to occur. v2 adds a write barrier to make sure IRQ
	threads see the notifier once it is created (replacing the
	WRITE_ONCE I put in v1). The best thing to do here, I believe,
	would be not to have any synchronization and make sure that an IRQ
	only gets enabled after the notifier is created.

Dariusz Marcinkiewicz (8):
  drm/i915/intel_hdmi: use cec_notifier_conn_(un)register
  dw-hdmi-cec: use cec_notifier_cec_adap_(un)register
  tda9950: use cec_notifier_cec_adap_(un)register
  drm: tda998x: use cec_notifier_conn_(un)register
  drm: sti: use cec_notifier_conn_(un)register
  drm: tegra: use cec_notifier_conn_(un)register
  drm: dw-hdmi: use cec_notifier_conn_(un)register
  drm: exynos: exynos_hdmi: use cec_notifier_conn_(un)register

 drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c | 13 ++++---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c     | 36 +++++++++++--------
 drivers/gpu/drm/exynos/exynos_hdmi.c          | 31 +++++++++-------
 drivers/gpu/drm/i2c/tda9950.c                 | 12 +++----
 drivers/gpu/drm/i2c/tda998x_drv.c             | 33 +++++++++++------
 drivers/gpu/drm/i915/display/intel_hdmi.c     | 13 ++++---
 drivers/gpu/drm/sti/sti_hdmi.c                | 19 ++++++----
 drivers/gpu/drm/tegra/output.c                | 28 +++++++++++----
 8 files changed, 117 insertions(+), 68 deletions(-)

-- 
2.23.0.rc1.153.gdeed80330f-goog


^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v6 1/8] drm/i915/intel_hdmi: use cec_notifier_conn_(un)register
  2019-08-13 11:02 [PATCH v6 0/8] drm: cec: convert DRM drivers to the new notifier API Dariusz Marcinkiewicz
@ 2019-08-13 11:02 ` Dariusz Marcinkiewicz
  2019-08-13 11:02 ` [PATCH v6 2/8] dw-hdmi-cec: use cec_notifier_cec_adap_(un)register Dariusz Marcinkiewicz
                   ` (6 subsequent siblings)
  7 siblings, 0 replies; 15+ messages in thread
From: Dariusz Marcinkiewicz @ 2019-08-13 11:02 UTC (permalink / raw)
  To: dri-devel, linux-media, hverkuil-cisco
  Cc: Dariusz Marcinkiewicz, Jani Nikula, Joonas Lahtinen,
	Rodrigo Vivi, David Airlie, Daniel Vetter,
	Ville Syrjälä,
	Chris Wilson, Maarten Lankhorst, Shashank Sharma, Ramalingam C,
	open list

Use the new cec_notifier_conn_(un)register() functions to
(un)register the notifier for the HDMI connector, and fill in
the cec_connector_info.

Signed-off-by: Dariusz Marcinkiewicz <darekm@google.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Tested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
 drivers/gpu/drm/i915/display/intel_hdmi.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index b1ca8e5bdb56d..9fcf2c58c29c5 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -2752,8 +2752,9 @@ intel_hdmi_connector_register(struct drm_connector *connector)
 
 static void intel_hdmi_destroy(struct drm_connector *connector)
 {
-	if (intel_attached_hdmi(connector)->cec_notifier)
-		cec_notifier_put(intel_attached_hdmi(connector)->cec_notifier);
+	struct cec_notifier *n = intel_attached_hdmi(connector)->cec_notifier;
+
+	cec_notifier_conn_unregister(n);
 
 	intel_connector_destroy(connector);
 }
@@ -3068,6 +3069,7 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
 	struct drm_device *dev = intel_encoder->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	enum port port = intel_encoder->port;
+	struct cec_connector_info conn_info;
 
 	DRM_DEBUG_KMS("Adding HDMI connector on port %c\n",
 		      port_name(port));
@@ -3120,8 +3122,11 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
 		I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
 	}
 
-	intel_hdmi->cec_notifier = cec_notifier_get_conn(dev->dev,
-							 port_identifier(port));
+	cec_fill_conn_info_from_drm(&conn_info, connector);
+
+	intel_hdmi->cec_notifier =
+		cec_notifier_conn_register(dev->dev, port_identifier(port),
+					   &conn_info);
 	if (!intel_hdmi->cec_notifier)
 		DRM_DEBUG_KMS("CEC notifier get failed\n");
 }
-- 
2.23.0.rc1.153.gdeed80330f-goog


^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v6 2/8] dw-hdmi-cec: use cec_notifier_cec_adap_(un)register
  2019-08-13 11:02 [PATCH v6 0/8] drm: cec: convert DRM drivers to the new notifier API Dariusz Marcinkiewicz
  2019-08-13 11:02 ` [PATCH v6 1/8] drm/i915/intel_hdmi: use cec_notifier_conn_(un)register Dariusz Marcinkiewicz
@ 2019-08-13 11:02 ` Dariusz Marcinkiewicz
  2019-08-13 11:02 ` [PATCH v6 3/8] tda9950: " Dariusz Marcinkiewicz
                   ` (5 subsequent siblings)
  7 siblings, 0 replies; 15+ messages in thread
From: Dariusz Marcinkiewicz @ 2019-08-13 11:02 UTC (permalink / raw)
  To: dri-devel, linux-media, hverkuil-cisco
  Cc: Dariusz Marcinkiewicz, Andrzej Hajda, Neil Armstrong,
	Laurent Pinchart, Jonas Karlman, Jernej Skrabec, David Airlie,
	Daniel Vetter, Enrico Weigelt, Kate Stewart, Thomas Gleixner,
	open list

Use the new cec_notifier_cec_adap_(un)register() functions to
(un)register the notifier for the CEC adapter.

Also adds CEC_CAP_CONNECTOR_INFO capability to the adapter.

Changes since v3:
	- add CEC_CAP_CONNECTOR_INFO to cec_allocate_adapter,
	- replace CEC_CAP_LOG_ADDRS | CEC_CAP_TRANSMIT |
	CEC_CAP_RC | CEC_CAP_PASSTHROUGH with CEC_CAP_DEFAULTS.

Signed-off-by: Dariusz Marcinkiewicz <darekm@google.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Tested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
index 0f949978d3fcd..ac1e001d08829 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
@@ -256,8 +256,8 @@ static int dw_hdmi_cec_probe(struct platform_device *pdev)
 	dw_hdmi_write(cec, 0, HDMI_CEC_POLARITY);
 
 	cec->adap = cec_allocate_adapter(&dw_hdmi_cec_ops, cec, "dw_hdmi",
-					 CEC_CAP_LOG_ADDRS | CEC_CAP_TRANSMIT |
-					 CEC_CAP_RC | CEC_CAP_PASSTHROUGH,
+					 CEC_CAP_DEFAULTS |
+					 CEC_CAP_CONNECTOR_INFO,
 					 CEC_MAX_LOG_ADDRS);
 	if (IS_ERR(cec->adap))
 		return PTR_ERR(cec->adap);
@@ -278,13 +278,14 @@ static int dw_hdmi_cec_probe(struct platform_device *pdev)
 	if (ret < 0)
 		return ret;
 
-	cec->notify = cec_notifier_get(pdev->dev.parent);
+	cec->notify = cec_notifier_cec_adap_register(pdev->dev.parent,
+						     NULL, cec->adap);
 	if (!cec->notify)
 		return -ENOMEM;
 
 	ret = cec_register_adapter(cec->adap, pdev->dev.parent);
 	if (ret < 0) {
-		cec_notifier_put(cec->notify);
+		cec_notifier_cec_adap_unregister(cec->notify);
 		return ret;
 	}
 
@@ -294,8 +295,6 @@ static int dw_hdmi_cec_probe(struct platform_device *pdev)
 	 */
 	devm_remove_action(&pdev->dev, dw_hdmi_cec_del, cec);
 
-	cec_register_cec_notifier(cec->adap, cec->notify);
-
 	return 0;
 }
 
@@ -303,8 +302,8 @@ static int dw_hdmi_cec_remove(struct platform_device *pdev)
 {
 	struct dw_hdmi_cec *cec = platform_get_drvdata(pdev);
 
+	cec_notifier_cec_adap_unregister(cec->notify);
 	cec_unregister_adapter(cec->adap);
-	cec_notifier_put(cec->notify);
 
 	return 0;
 }
-- 
2.23.0.rc1.153.gdeed80330f-goog


^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v6 3/8] tda9950: use cec_notifier_cec_adap_(un)register
  2019-08-13 11:02 [PATCH v6 0/8] drm: cec: convert DRM drivers to the new notifier API Dariusz Marcinkiewicz
  2019-08-13 11:02 ` [PATCH v6 1/8] drm/i915/intel_hdmi: use cec_notifier_conn_(un)register Dariusz Marcinkiewicz
  2019-08-13 11:02 ` [PATCH v6 2/8] dw-hdmi-cec: use cec_notifier_cec_adap_(un)register Dariusz Marcinkiewicz
@ 2019-08-13 11:02 ` " Dariusz Marcinkiewicz
  2019-08-13 11:32   ` Russell King - ARM Linux admin
  2019-08-13 11:02 ` [PATCH v6 4/8] drm: tda998x: use cec_notifier_conn_(un)register Dariusz Marcinkiewicz
                   ` (4 subsequent siblings)
  7 siblings, 1 reply; 15+ messages in thread
From: Dariusz Marcinkiewicz @ 2019-08-13 11:02 UTC (permalink / raw)
  To: dri-devel, linux-media, hverkuil-cisco
  Cc: Dariusz Marcinkiewicz, David Airlie, Daniel Vetter, Russell King,
	Hans Verkuil, Kate Stewart, Allison Randal, Thomas Gleixner,
	Kees Cook, Colin Ian King, open list

Use the new cec_notifier_cec_adap_(un)register() functions to
(un)register the notifier for the CEC adapter.

Signed-off-by: Dariusz Marcinkiewicz <darekm@google.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Tested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
 drivers/gpu/drm/i2c/tda9950.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i2c/tda9950.c b/drivers/gpu/drm/i2c/tda9950.c
index 8039fc0d83db4..a5a75bdeb7a5f 100644
--- a/drivers/gpu/drm/i2c/tda9950.c
+++ b/drivers/gpu/drm/i2c/tda9950.c
@@ -420,7 +420,8 @@ static int tda9950_probe(struct i2c_client *client,
 		priv->hdmi = glue->parent;
 
 	priv->adap = cec_allocate_adapter(&tda9950_cec_ops, priv, "tda9950",
-					  CEC_CAP_DEFAULTS,
+					  CEC_CAP_DEFAULTS |
+					  CEC_CAP_CONNECTOR_INFO,
 					  CEC_MAX_LOG_ADDRS);
 	if (IS_ERR(priv->adap))
 		return PTR_ERR(priv->adap);
@@ -457,13 +458,14 @@ static int tda9950_probe(struct i2c_client *client,
 	if (ret < 0)
 		return ret;
 
-	priv->notify = cec_notifier_get(priv->hdmi);
+	priv->notify = cec_notifier_cec_adap_register(priv->hdmi, NULL,
+						      priv->adap);
 	if (!priv->notify)
 		return -ENOMEM;
 
 	ret = cec_register_adapter(priv->adap, priv->hdmi);
 	if (ret < 0) {
-		cec_notifier_put(priv->notify);
+		cec_notifier_cec_adap_unregister(priv->notify);
 		return ret;
 	}
 
@@ -473,8 +475,6 @@ static int tda9950_probe(struct i2c_client *client,
 	 */
 	devm_remove_action(dev, tda9950_cec_del, priv);
 
-	cec_register_cec_notifier(priv->adap, priv->notify);
-
 	return 0;
 }
 
@@ -482,8 +482,8 @@ static int tda9950_remove(struct i2c_client *client)
 {
 	struct tda9950_priv *priv = i2c_get_clientdata(client);
 
+	cec_notifier_cec_adap_unregister(priv->notify);
 	cec_unregister_adapter(priv->adap);
-	cec_notifier_put(priv->notify);
 
 	return 0;
 }
-- 
2.23.0.rc1.153.gdeed80330f-goog


^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v6 4/8] drm: tda998x: use cec_notifier_conn_(un)register
  2019-08-13 11:02 [PATCH v6 0/8] drm: cec: convert DRM drivers to the new notifier API Dariusz Marcinkiewicz
                   ` (2 preceding siblings ...)
  2019-08-13 11:02 ` [PATCH v6 3/8] tda9950: " Dariusz Marcinkiewicz
@ 2019-08-13 11:02 ` Dariusz Marcinkiewicz
  2019-08-13 11:20   ` Russell King - ARM Linux admin
  2019-08-13 11:02 ` [PATCH v6 5/8] drm: sti: " Dariusz Marcinkiewicz
                   ` (3 subsequent siblings)
  7 siblings, 1 reply; 15+ messages in thread
From: Dariusz Marcinkiewicz @ 2019-08-13 11:02 UTC (permalink / raw)
  To: dri-devel, linux-media, hverkuil-cisco
  Cc: Dariusz Marcinkiewicz, Russell King, David Airlie, Daniel Vetter,
	open list

Use the new cec_notifier_conn_(un)register() functions to
(un)register the notifier for the HDMI connector, and fill
in the cec_connector_info.

Changes since v2:
	- cec_notifier_phys_addr_invalidate where appropriate,
	- don't check for NULL notifier before calling
	cec_notifier_conn_unregister.
Changes since v1:
	Add memory barrier to make sure that the notifier
	becomes visible to the irq thread once it is
	fully constructed.

Signed-off-by: Dariusz Marcinkiewicz <darekm@google.com>
Tested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
 drivers/gpu/drm/i2c/tda998x_drv.c | 33 +++++++++++++++++++++----------
 1 file changed, 23 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 61e042918a7fc..19a63ee1b3f53 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -804,9 +804,14 @@ static irqreturn_t tda998x_irq_thread(int irq, void *data)
 			if (lvl & CEC_RXSHPDLEV_HPD) {
 				tda998x_edid_delay_start(priv);
 			} else {
+				struct cec_notifier *notify;
+
 				schedule_work(&priv->detect_work);
-				cec_notifier_set_phys_addr(priv->cec_notify,
-						   CEC_PHYS_ADDR_INVALID);
+
+				notify = READ_ONCE(priv->cec_notify);
+				if (notify)
+					cec_notifier_phys_addr_invalidate(
+							notify);
 			}
 
 			handled = true;
@@ -1331,6 +1336,8 @@ static int tda998x_connector_init(struct tda998x_priv *priv,
 				  struct drm_device *drm)
 {
 	struct drm_connector *connector = &priv->connector;
+	struct cec_connector_info conn_info;
+	struct cec_notifier *notifier;
 	int ret;
 
 	connector->interlace_allowed = 1;
@@ -1347,6 +1354,19 @@ static int tda998x_connector_init(struct tda998x_priv *priv,
 	if (ret)
 		return ret;
 
+	cec_fill_conn_info_from_drm(&conn_info, connector);
+
+	notifier = cec_notifier_conn_register(priv->cec_glue.parent,
+					      NULL, &conn_info);
+	if (!notifier)
+		return -ENOMEM;
+	/*
+	 * Make sure that tda998x_irq_thread does see the notifier
+	 * when it fully constructed.
+	 */
+	smp_wmb();
+	priv->cec_notify = notifier;
+
 	drm_connector_attach_encoder(&priv->connector,
 				     priv->bridge.encoder);
 
@@ -1790,8 +1810,7 @@ static void tda998x_destroy(struct device *dev)
 
 	i2c_unregister_device(priv->cec);
 
-	if (priv->cec_notify)
-		cec_notifier_put(priv->cec_notify);
+	cec_notifier_conn_unregister(priv->cec_notify);
 }
 
 static int tda998x_create(struct device *dev)
@@ -1916,12 +1935,6 @@ static int tda998x_create(struct device *dev)
 		cec_write(priv, REG_CEC_RXSHPDINTENA, CEC_RXSHPDLEV_HPD);
 	}
 
-	priv->cec_notify = cec_notifier_get(dev);
-	if (!priv->cec_notify) {
-		ret = -ENOMEM;
-		goto fail;
-	}
-
 	priv->cec_glue.parent = dev;
 	priv->cec_glue.data = priv;
 	priv->cec_glue.init = tda998x_cec_hook_init;
-- 
2.23.0.rc1.153.gdeed80330f-goog


^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v6 5/8] drm: sti: use cec_notifier_conn_(un)register
  2019-08-13 11:02 [PATCH v6 0/8] drm: cec: convert DRM drivers to the new notifier API Dariusz Marcinkiewicz
                   ` (3 preceding siblings ...)
  2019-08-13 11:02 ` [PATCH v6 4/8] drm: tda998x: use cec_notifier_conn_(un)register Dariusz Marcinkiewicz
@ 2019-08-13 11:02 ` " Dariusz Marcinkiewicz
  2019-08-13 11:02 ` [PATCH v6 6/8] drm: tegra: " Dariusz Marcinkiewicz
                   ` (2 subsequent siblings)
  7 siblings, 0 replies; 15+ messages in thread
From: Dariusz Marcinkiewicz @ 2019-08-13 11:02 UTC (permalink / raw)
  To: dri-devel, linux-media, hverkuil-cisco
  Cc: Dariusz Marcinkiewicz, Benjamin Gaignard, Vincent Abriou,
	David Airlie, Daniel Vetter, open list

Use the new cec_notifier_conn_(un)register() functions to
(un)register the notifier for the HDMI connector, and fill
in the cec_connector_info.

Changes since v2:
	Don't invalidate physical address before unregistering the
	notifier.

Signed-off-by: Dariusz Marcinkiewicz <darekm@google.com>
---
 drivers/gpu/drm/sti/sti_hdmi.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/sti/sti_hdmi.c b/drivers/gpu/drm/sti/sti_hdmi.c
index 9862c322f0c4a..bd15902b825ad 100644
--- a/drivers/gpu/drm/sti/sti_hdmi.c
+++ b/drivers/gpu/drm/sti/sti_hdmi.c
@@ -1256,6 +1256,7 @@ static int sti_hdmi_bind(struct device *dev, struct device *master, void *data)
 	struct drm_device *drm_dev = data;
 	struct drm_encoder *encoder;
 	struct sti_hdmi_connector *connector;
+	struct cec_connector_info conn_info;
 	struct drm_connector *drm_connector;
 	struct drm_bridge *bridge;
 	int err;
@@ -1318,6 +1319,14 @@ static int sti_hdmi_bind(struct device *dev, struct device *master, void *data)
 		goto err_sysfs;
 	}
 
+	cec_fill_conn_info_from_drm(&conn_info, drm_connector);
+	hdmi->notifier = cec_notifier_conn_register(&hdmi->dev, NULL,
+						    &conn_info);
+	if (!hdmi->notifier) {
+		hdmi->drm_connector = NULL;
+		return -ENOMEM;
+	}
+
 	/* Enable default interrupts */
 	hdmi_write(hdmi, HDMI_DEFAULT_INT, HDMI_INT_EN);
 
@@ -1331,6 +1340,9 @@ static int sti_hdmi_bind(struct device *dev, struct device *master, void *data)
 static void sti_hdmi_unbind(struct device *dev,
 		struct device *master, void *data)
 {
+	struct sti_hdmi *hdmi = dev_get_drvdata(dev);
+
+	cec_notifier_conn_unregister(hdmi->notifier);
 }
 
 static const struct component_ops sti_hdmi_ops = {
@@ -1436,10 +1448,6 @@ static int sti_hdmi_probe(struct platform_device *pdev)
 		goto release_adapter;
 	}
 
-	hdmi->notifier = cec_notifier_get(&pdev->dev);
-	if (!hdmi->notifier)
-		goto release_adapter;
-
 	hdmi->reset = devm_reset_control_get(dev, "hdmi");
 	/* Take hdmi out of reset */
 	if (!IS_ERR(hdmi->reset))
@@ -1459,14 +1467,11 @@ static int sti_hdmi_remove(struct platform_device *pdev)
 {
 	struct sti_hdmi *hdmi = dev_get_drvdata(&pdev->dev);
 
-	cec_notifier_set_phys_addr(hdmi->notifier, CEC_PHYS_ADDR_INVALID);
-
 	i2c_put_adapter(hdmi->ddc_adapt);
 	if (hdmi->audio_pdev)
 		platform_device_unregister(hdmi->audio_pdev);
 	component_del(&pdev->dev, &sti_hdmi_ops);
 
-	cec_notifier_put(hdmi->notifier);
 	return 0;
 }
 
-- 
2.23.0.rc1.153.gdeed80330f-goog


^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v6 6/8] drm: tegra: use cec_notifier_conn_(un)register
  2019-08-13 11:02 [PATCH v6 0/8] drm: cec: convert DRM drivers to the new notifier API Dariusz Marcinkiewicz
                   ` (4 preceding siblings ...)
  2019-08-13 11:02 ` [PATCH v6 5/8] drm: sti: " Dariusz Marcinkiewicz
@ 2019-08-13 11:02 ` " Dariusz Marcinkiewicz
  2019-08-13 11:02 ` [PATCH v6 7/8] drm: dw-hdmi: " Dariusz Marcinkiewicz
  2019-08-13 11:02 ` [PATCH v6 8/8] drm: exynos: exynos_hdmi: " Dariusz Marcinkiewicz
  7 siblings, 0 replies; 15+ messages in thread
From: Dariusz Marcinkiewicz @ 2019-08-13 11:02 UTC (permalink / raw)
  To: dri-devel, linux-media, hverkuil-cisco
  Cc: Dariusz Marcinkiewicz, Thierry Reding, David Airlie,
	Daniel Vetter, Jonathan Hunter,
	open list:DRM DRIVERS FOR NVIDIA TEGRA, open list

Use the new cec_notifier_conn_(un)register() functions to
(un)register the notifier for the HDMI connector, and fill in
the cec_connector_info.

Changes since v4:
	- only create a CEC notifier for HDMI connectors

Signed-off-by: Dariusz Marcinkiewicz <darekm@google.com>
Tested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
 drivers/gpu/drm/tegra/output.c | 28 +++++++++++++++++++++-------
 1 file changed, 21 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/tegra/output.c b/drivers/gpu/drm/tegra/output.c
index bdcaa4c7168cf..34373734ff689 100644
--- a/drivers/gpu/drm/tegra/output.c
+++ b/drivers/gpu/drm/tegra/output.c
@@ -70,6 +70,11 @@ tegra_output_connector_detect(struct drm_connector *connector, bool force)
 
 void tegra_output_connector_destroy(struct drm_connector *connector)
 {
+	struct tegra_output *output = connector_to_output(connector);
+
+	if (output->cec)
+		cec_notifier_conn_unregister(output->cec);
+
 	drm_connector_unregister(connector);
 	drm_connector_cleanup(connector);
 }
@@ -163,18 +168,11 @@ int tegra_output_probe(struct tegra_output *output)
 		disable_irq(output->hpd_irq);
 	}
 
-	output->cec = cec_notifier_get(output->dev);
-	if (!output->cec)
-		return -ENOMEM;
-
 	return 0;
 }
 
 void tegra_output_remove(struct tegra_output *output)
 {
-	if (output->cec)
-		cec_notifier_put(output->cec);
-
 	if (output->hpd_gpio)
 		free_irq(output->hpd_irq, output);
 
@@ -184,6 +182,7 @@ void tegra_output_remove(struct tegra_output *output)
 
 int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
 {
+	int connector_type;
 	int err;
 
 	if (output->panel) {
@@ -199,6 +198,21 @@ int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
 	if (output->hpd_gpio)
 		enable_irq(output->hpd_irq);
 
+	connector_type = output->connector.connector_type;
+	/*
+	 * Create a CEC notifier for HDMI connector.
+	 */
+	if (connector_type == DRM_MODE_CONNECTOR_HDMIA ||
+	    connector_type == DRM_MODE_CONNECTOR_HDMIB) {
+		struct cec_connector_info conn_info;
+
+		cec_fill_conn_info_from_drm(&conn_info, &output->connector);
+		output->cec = cec_notifier_conn_register(output->dev, NULL,
+							 &conn_info);
+		if (!output->cec)
+			return -ENOMEM;
+	}
+
 	return 0;
 }
 
-- 
2.23.0.rc1.153.gdeed80330f-goog


^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v6 7/8] drm: dw-hdmi: use cec_notifier_conn_(un)register
  2019-08-13 11:02 [PATCH v6 0/8] drm: cec: convert DRM drivers to the new notifier API Dariusz Marcinkiewicz
                   ` (5 preceding siblings ...)
  2019-08-13 11:02 ` [PATCH v6 6/8] drm: tegra: " Dariusz Marcinkiewicz
@ 2019-08-13 11:02 ` " Dariusz Marcinkiewicz
  2019-08-13 11:37   ` Hans Verkuil
  2019-08-13 11:02 ` [PATCH v6 8/8] drm: exynos: exynos_hdmi: " Dariusz Marcinkiewicz
  7 siblings, 1 reply; 15+ messages in thread
From: Dariusz Marcinkiewicz @ 2019-08-13 11:02 UTC (permalink / raw)
  To: dri-devel, linux-media, hverkuil-cisco
  Cc: Dariusz Marcinkiewicz, Andrzej Hajda, Neil Armstrong,
	Laurent Pinchart, Jonas Karlman, Jernej Skrabec, David Airlie,
	Daniel Vetter, Sam Ravnborg, Douglas Anderson, open list

Use the new cec_notifier_conn_(un)register() functions to
(un)register the notifier for the HDMI connector, and fill in
the cec_connector_info.

Changes since v4:
	- typo fix
Changes since v2:
	- removed unnecessary NULL check before a call to
	cec_notifier_conn_unregister,
	- use cec_notifier_phys_addr_invalidate to invalidate physical
	address.
Changes since v1:
	Add memory barrier to make sure that the notifier
	becomes visible to the irq thread once it is fully
	constructed.

Signed-off-by: Dariusz Marcinkiewicz <darekm@google.com>
Tested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 36 ++++++++++++++---------
 1 file changed, 22 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 83b94b66e464e..c00184700bb9d 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -2194,6 +2194,8 @@ static int dw_hdmi_bridge_attach(struct drm_bridge *bridge)
 	struct dw_hdmi *hdmi = bridge->driver_private;
 	struct drm_encoder *encoder = bridge->encoder;
 	struct drm_connector *connector = &hdmi->connector;
+	struct cec_connector_info conn_info;
+	struct cec_notifier *notifier;
 
 	connector->interlace_allowed = 1;
 	connector->polled = DRM_CONNECTOR_POLL_HPD;
@@ -2207,6 +2209,18 @@ static int dw_hdmi_bridge_attach(struct drm_bridge *bridge)
 
 	drm_connector_attach_encoder(connector, encoder);
 
+	cec_fill_conn_info_from_drm(&conn_info, connector);
+
+	notifier = cec_notifier_conn_register(hdmi->dev, NULL, &conn_info);
+	if (!notifier)
+		return -ENOMEM;
+	/*
+	 * Make sure that dw_hdmi_irq thread does see the notifier
+	 * when it fully constructed.
+	 */
+	smp_wmb();
+	hdmi->cec_notifier = notifier;
+
 	return 0;
 }
 
@@ -2373,9 +2387,13 @@ static irqreturn_t dw_hdmi_irq(int irq, void *dev_id)
 				       phy_stat & HDMI_PHY_HPD,
 				       phy_stat & HDMI_PHY_RX_SENSE);
 
-		if ((phy_stat & (HDMI_PHY_RX_SENSE | HDMI_PHY_HPD)) == 0)
-			cec_notifier_set_phys_addr(hdmi->cec_notifier,
-						   CEC_PHYS_ADDR_INVALID);
+		if ((phy_stat & (HDMI_PHY_RX_SENSE | HDMI_PHY_HPD)) == 0) {
+			struct cec_notifier *notifier;
+
+			notifier = READ_ONCE(hdmi->cec_notifier);
+			if (notifier)
+				cec_notifier_phys_addr_invalidate(notifier);
+		}
 	}
 
 	if (intr_stat & HDMI_IH_PHY_STAT0_HPD) {
@@ -2693,12 +2711,6 @@ __dw_hdmi_probe(struct platform_device *pdev,
 	if (ret)
 		goto err_iahb;
 
-	hdmi->cec_notifier = cec_notifier_get(dev);
-	if (!hdmi->cec_notifier) {
-		ret = -ENOMEM;
-		goto err_iahb;
-	}
-
 	/*
 	 * To prevent overflows in HDMI_IH_FC_STAT2, set the clk regenerator
 	 * N and cts values before enabling phy
@@ -2796,9 +2808,6 @@ __dw_hdmi_probe(struct platform_device *pdev,
 		hdmi->ddc = NULL;
 	}
 
-	if (hdmi->cec_notifier)
-		cec_notifier_put(hdmi->cec_notifier);
-
 	clk_disable_unprepare(hdmi->iahb_clk);
 	if (hdmi->cec_clk)
 		clk_disable_unprepare(hdmi->cec_clk);
@@ -2820,8 +2829,7 @@ static void __dw_hdmi_remove(struct dw_hdmi *hdmi)
 	/* Disable all interrupts */
 	hdmi_writeb(hdmi, ~0, HDMI_IH_MUTE_PHY_STAT0);
 
-	if (hdmi->cec_notifier)
-		cec_notifier_put(hdmi->cec_notifier);
+	cec_notifier_conn_unregister(hdmi->cec_notifier);
 
 	clk_disable_unprepare(hdmi->iahb_clk);
 	clk_disable_unprepare(hdmi->isfr_clk);
-- 
2.23.0.rc1.153.gdeed80330f-goog


^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v6 8/8] drm: exynos: exynos_hdmi: use cec_notifier_conn_(un)register
  2019-08-13 11:02 [PATCH v6 0/8] drm: cec: convert DRM drivers to the new notifier API Dariusz Marcinkiewicz
                   ` (6 preceding siblings ...)
  2019-08-13 11:02 ` [PATCH v6 7/8] drm: dw-hdmi: " Dariusz Marcinkiewicz
@ 2019-08-13 11:02 ` " Dariusz Marcinkiewicz
  7 siblings, 0 replies; 15+ messages in thread
From: Dariusz Marcinkiewicz @ 2019-08-13 11:02 UTC (permalink / raw)
  To: dri-devel, linux-media, hverkuil-cisco
  Cc: Dariusz Marcinkiewicz, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, David Airlie, Daniel Vetter, Kukjin Kim,
	Krzysztof Kozlowski,
	moderated list:ARM/SAMSUNG EXYNOS ARM ARCHITECTURES,
	moderated list:ARM/SAMSUNG EXYNOS ARM ARCHITECTURES, open list

Use the new cec_notifier_conn_(un)register() functions to
(un)register the notifier for the HDMI connector, and fill in
the cec_connector_info.

Changes since v2:
	- removed unnecessary call to invalidate phys address before
	deregistering the notifier,
	- use cec_notifier_phys_addr_invalidate instead of setting
	invalid address on a notifier.

Signed-off-by: Dariusz Marcinkiewicz <darekm@google.com>
Tested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
 drivers/gpu/drm/exynos/exynos_hdmi.c | 31 ++++++++++++++++------------
 1 file changed, 18 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index bc1565f1822ab..d532b468d9af5 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -852,6 +852,10 @@ static enum drm_connector_status hdmi_detect(struct drm_connector *connector,
 
 static void hdmi_connector_destroy(struct drm_connector *connector)
 {
+	struct hdmi_context *hdata = connector_to_hdmi(connector);
+
+	cec_notifier_conn_unregister(hdata->notifier);
+
 	drm_connector_unregister(connector);
 	drm_connector_cleanup(connector);
 }
@@ -935,6 +939,7 @@ static int hdmi_create_connector(struct drm_encoder *encoder)
 {
 	struct hdmi_context *hdata = encoder_to_hdmi(encoder);
 	struct drm_connector *connector = &hdata->connector;
+	struct cec_connector_info conn_info;
 	int ret;
 
 	connector->interlace_allowed = true;
@@ -957,6 +962,15 @@ static int hdmi_create_connector(struct drm_encoder *encoder)
 			DRM_DEV_ERROR(hdata->dev, "Failed to attach bridge\n");
 	}
 
+	cec_fill_conn_info_from_drm(&conn_info, connector);
+
+	hdata->notifier = cec_notifier_conn_register(hdata->dev, NULL,
+						     &conn_info);
+	if (hdata->notifier == NULL) {
+		ret = -ENOMEM;
+		DRM_DEV_ERROR(hdata->dev, "Failed to allocate CEC notifier\n");
+	}
+
 	return ret;
 }
 
@@ -1528,8 +1542,8 @@ static void hdmi_disable(struct drm_encoder *encoder)
 		 */
 		mutex_unlock(&hdata->mutex);
 		cancel_delayed_work(&hdata->hotplug_work);
-		cec_notifier_set_phys_addr(hdata->notifier,
-					   CEC_PHYS_ADDR_INVALID);
+		if (hdata->notifier)
+			cec_notifier_phys_addr_invalidate(hdata->notifier);
 		return;
 	}
 
@@ -2006,12 +2020,6 @@ static int hdmi_probe(struct platform_device *pdev)
 		}
 	}
 
-	hdata->notifier = cec_notifier_get(&pdev->dev);
-	if (hdata->notifier == NULL) {
-		ret = -ENOMEM;
-		goto err_hdmiphy;
-	}
-
 	pm_runtime_enable(dev);
 
 	audio_infoframe = &hdata->audio.infoframe;
@@ -2023,7 +2031,7 @@ static int hdmi_probe(struct platform_device *pdev)
 
 	ret = hdmi_register_audio_device(hdata);
 	if (ret)
-		goto err_notifier_put;
+		goto err_runtime_disable;
 
 	ret = component_add(&pdev->dev, &hdmi_component_ops);
 	if (ret)
@@ -2034,8 +2042,7 @@ static int hdmi_probe(struct platform_device *pdev)
 err_unregister_audio:
 	platform_device_unregister(hdata->audio.pdev);
 
-err_notifier_put:
-	cec_notifier_put(hdata->notifier);
+err_runtime_disable:
 	pm_runtime_disable(dev);
 
 err_hdmiphy:
@@ -2054,12 +2061,10 @@ static int hdmi_remove(struct platform_device *pdev)
 	struct hdmi_context *hdata = platform_get_drvdata(pdev);
 
 	cancel_delayed_work_sync(&hdata->hotplug_work);
-	cec_notifier_set_phys_addr(hdata->notifier, CEC_PHYS_ADDR_INVALID);
 
 	component_del(&pdev->dev, &hdmi_component_ops);
 	platform_device_unregister(hdata->audio.pdev);
 
-	cec_notifier_put(hdata->notifier);
 	pm_runtime_disable(&pdev->dev);
 
 	if (!IS_ERR(hdata->reg_hdmi_en))
-- 
2.23.0.rc1.153.gdeed80330f-goog


^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [PATCH v6 4/8] drm: tda998x: use cec_notifier_conn_(un)register
  2019-08-13 11:02 ` [PATCH v6 4/8] drm: tda998x: use cec_notifier_conn_(un)register Dariusz Marcinkiewicz
@ 2019-08-13 11:20   ` Russell King - ARM Linux admin
  2019-08-14 10:52     ` Dariusz Marcinkiewicz
  0 siblings, 1 reply; 15+ messages in thread
From: Russell King - ARM Linux admin @ 2019-08-13 11:20 UTC (permalink / raw)
  To: Dariusz Marcinkiewicz
  Cc: dri-devel, linux-media, hverkuil-cisco, David Airlie,
	Daniel Vetter, open list

On Tue, Aug 13, 2019 at 01:02:36PM +0200, Dariusz Marcinkiewicz wrote:
> Use the new cec_notifier_conn_(un)register() functions to
> (un)register the notifier for the HDMI connector, and fill
> in the cec_connector_info.
> 
> Changes since v2:
> 	- cec_notifier_phys_addr_invalidate where appropriate,
> 	- don't check for NULL notifier before calling
> 	cec_notifier_conn_unregister.
> Changes since v1:
> 	Add memory barrier to make sure that the notifier
> 	becomes visible to the irq thread once it is
> 	fully constructed.
> 
> Signed-off-by: Dariusz Marcinkiewicz <darekm@google.com>
> Tested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
> ---
>  drivers/gpu/drm/i2c/tda998x_drv.c | 33 +++++++++++++++++++++----------
>  1 file changed, 23 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
> index 61e042918a7fc..19a63ee1b3f53 100644
> --- a/drivers/gpu/drm/i2c/tda998x_drv.c
> +++ b/drivers/gpu/drm/i2c/tda998x_drv.c
> @@ -804,9 +804,14 @@ static irqreturn_t tda998x_irq_thread(int irq, void *data)
>  			if (lvl & CEC_RXSHPDLEV_HPD) {
>  				tda998x_edid_delay_start(priv);
>  			} else {
> +				struct cec_notifier *notify;
> +
>  				schedule_work(&priv->detect_work);
> -				cec_notifier_set_phys_addr(priv->cec_notify,
> -						   CEC_PHYS_ADDR_INVALID);
> +
> +				notify = READ_ONCE(priv->cec_notify);
> +				if (notify)
> +					cec_notifier_phys_addr_invalidate(
> +							notify);
>  			}
>  
>  			handled = true;
> @@ -1331,6 +1336,8 @@ static int tda998x_connector_init(struct tda998x_priv *priv,
>  				  struct drm_device *drm)
>  {
>  	struct drm_connector *connector = &priv->connector;
> +	struct cec_connector_info conn_info;
> +	struct cec_notifier *notifier;
>  	int ret;
>  
>  	connector->interlace_allowed = 1;
> @@ -1347,6 +1354,19 @@ static int tda998x_connector_init(struct tda998x_priv *priv,
>  	if (ret)
>  		return ret;
>  
> +	cec_fill_conn_info_from_drm(&conn_info, connector);
> +
> +	notifier = cec_notifier_conn_register(priv->cec_glue.parent,
> +					      NULL, &conn_info);
> +	if (!notifier)
> +		return -ENOMEM;
> +	/*
> +	 * Make sure that tda998x_irq_thread does see the notifier
> +	 * when it fully constructed.
> +	 */
> +	smp_wmb();
> +	priv->cec_notify = notifier;

To nitpick, this comment and the following code do not go together.

I think what you actually mean is:

	 * Make sure that tda998x_irq_thread sees the notifier
	 * only after it is fully constructed.

> +
>  	drm_connector_attach_encoder(&priv->connector,
>  				     priv->bridge.encoder);
>  
> @@ -1790,8 +1810,7 @@ static void tda998x_destroy(struct device *dev)
>  
>  	i2c_unregister_device(priv->cec);
>  
> -	if (priv->cec_notify)
> -		cec_notifier_put(priv->cec_notify);
> +	cec_notifier_conn_unregister(priv->cec_notify);

This also doesn't make sense: tda998x_destroy() is the opposite of
tda998x_create().  However, tda998x_connector_destroy() is the
opposite of tda998x_connector_create().

By moving the CEC creation code into tda998x_connector_create(), you
are creating the possibility for the following sequence to mess up
CEC and leak:

	tda998x_create()
	tda998x_connector_create()
	tda998x_connector_destroy()
	tda998x_connector_create()
	tda998x_connector_destroy()
	tda998x_destroy()

Anything you create in tda998x_connector_create() must be cleaned up
by tda998x_connector_destroy().

>  }
>  
>  static int tda998x_create(struct device *dev)
> @@ -1916,12 +1935,6 @@ static int tda998x_create(struct device *dev)
>  		cec_write(priv, REG_CEC_RXSHPDINTENA, CEC_RXSHPDLEV_HPD);
>  	}
>  
> -	priv->cec_notify = cec_notifier_get(dev);
> -	if (!priv->cec_notify) {
> -		ret = -ENOMEM;
> -		goto fail;
> -	}
> -
>  	priv->cec_glue.parent = dev;
>  	priv->cec_glue.data = priv;
>  	priv->cec_glue.init = tda998x_cec_hook_init;
> -- 
> 2.23.0.rc1.153.gdeed80330f-goog
> 
> 

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up
According to speedtest.net: 11.9Mbps down 500kbps up

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [PATCH v6 3/8] tda9950: use cec_notifier_cec_adap_(un)register
  2019-08-13 11:02 ` [PATCH v6 3/8] tda9950: " Dariusz Marcinkiewicz
@ 2019-08-13 11:32   ` Russell King - ARM Linux admin
  2019-08-13 11:44     ` Hans Verkuil
  0 siblings, 1 reply; 15+ messages in thread
From: Russell King - ARM Linux admin @ 2019-08-13 11:32 UTC (permalink / raw)
  To: Dariusz Marcinkiewicz
  Cc: dri-devel, linux-media, hverkuil-cisco, David Airlie,
	Daniel Vetter, Hans Verkuil, Kate Stewart, Allison Randal,
	Thomas Gleixner, Kees Cook, Colin Ian King, open list

On Tue, Aug 13, 2019 at 01:02:35PM +0200, Dariusz Marcinkiewicz wrote:
> Use the new cec_notifier_cec_adap_(un)register() functions to
> (un)register the notifier for the CEC adapter.
> 
> Signed-off-by: Dariusz Marcinkiewicz <darekm@google.com>
> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
> Tested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
> ---
>  drivers/gpu/drm/i2c/tda9950.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i2c/tda9950.c b/drivers/gpu/drm/i2c/tda9950.c
> index 8039fc0d83db4..a5a75bdeb7a5f 100644
> --- a/drivers/gpu/drm/i2c/tda9950.c
> +++ b/drivers/gpu/drm/i2c/tda9950.c
> @@ -420,7 +420,8 @@ static int tda9950_probe(struct i2c_client *client,
>  		priv->hdmi = glue->parent;
>  
>  	priv->adap = cec_allocate_adapter(&tda9950_cec_ops, priv, "tda9950",
> -					  CEC_CAP_DEFAULTS,
> +					  CEC_CAP_DEFAULTS |
> +					  CEC_CAP_CONNECTOR_INFO,
>  					  CEC_MAX_LOG_ADDRS);
>  	if (IS_ERR(priv->adap))
>  		return PTR_ERR(priv->adap);
> @@ -457,13 +458,14 @@ static int tda9950_probe(struct i2c_client *client,
>  	if (ret < 0)
>  		return ret;
>  
> -	priv->notify = cec_notifier_get(priv->hdmi);
> +	priv->notify = cec_notifier_cec_adap_register(priv->hdmi, NULL,
> +						      priv->adap);
>  	if (!priv->notify)
>  		return -ENOMEM;
>  
>  	ret = cec_register_adapter(priv->adap, priv->hdmi);
>  	if (ret < 0) {
> -		cec_notifier_put(priv->notify);
> +		cec_notifier_cec_adap_unregister(priv->notify);
>  		return ret;
>  	}
>  
> @@ -473,8 +475,6 @@ static int tda9950_probe(struct i2c_client *client,
>  	 */
>  	devm_remove_action(dev, tda9950_cec_del, priv);
>  
> -	cec_register_cec_notifier(priv->adap, priv->notify);
> -
>  	return 0;
>  }
>  
> @@ -482,8 +482,8 @@ static int tda9950_remove(struct i2c_client *client)
>  {
>  	struct tda9950_priv *priv = i2c_get_clientdata(client);
>  
> +	cec_notifier_cec_adap_unregister(priv->notify);
>  	cec_unregister_adapter(priv->adap);
> -	cec_notifier_put(priv->notify);

It looks weird to have an unexpectedly different ordering of
unregistration from the registration path - normally, unregistration
is the reverse order of initialisation.

In the initialisation path, it seems that we register the notifier
and _then_ the adapter.  Here, we unregister the notifier and then
the adapter rather than what would normally be expected.  Why is
this?  I suspect there will be drivers created that do this the
"normal" way round, so if this is a requirement, it needs to be made
plainly obvious.

>  
>  	return 0;
>  }
> -- 
> 2.23.0.rc1.153.gdeed80330f-goog
> 
> 

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up
According to speedtest.net: 11.9Mbps down 500kbps up

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [PATCH v6 7/8] drm: dw-hdmi: use cec_notifier_conn_(un)register
  2019-08-13 11:02 ` [PATCH v6 7/8] drm: dw-hdmi: " Dariusz Marcinkiewicz
@ 2019-08-13 11:37   ` Hans Verkuil
  2019-08-14 10:49     ` Dariusz Marcinkiewicz
  0 siblings, 1 reply; 15+ messages in thread
From: Hans Verkuil @ 2019-08-13 11:37 UTC (permalink / raw)
  To: Dariusz Marcinkiewicz, dri-devel, linux-media
  Cc: Andrzej Hajda, Neil Armstrong, Laurent Pinchart, Jonas Karlman,
	Jernej Skrabec, David Airlie, Daniel Vetter, Sam Ravnborg,
	Douglas Anderson, open list

On 8/13/19 1:02 PM, Dariusz Marcinkiewicz wrote:
> Use the new cec_notifier_conn_(un)register() functions to
> (un)register the notifier for the HDMI connector, and fill in
> the cec_connector_info.
> 
> Changes since v4:
> 	- typo fix
> Changes since v2:
> 	- removed unnecessary NULL check before a call to
> 	cec_notifier_conn_unregister,
> 	- use cec_notifier_phys_addr_invalidate to invalidate physical
> 	address.
> Changes since v1:
> 	Add memory barrier to make sure that the notifier
> 	becomes visible to the irq thread once it is fully
> 	constructed.
> 
> Signed-off-by: Dariusz Marcinkiewicz <darekm@google.com>
> Tested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
> ---
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 36 ++++++++++++++---------
>  1 file changed, 22 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 83b94b66e464e..c00184700bb9d 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -2194,6 +2194,8 @@ static int dw_hdmi_bridge_attach(struct drm_bridge *bridge)
>  	struct dw_hdmi *hdmi = bridge->driver_private;
>  	struct drm_encoder *encoder = bridge->encoder;
>  	struct drm_connector *connector = &hdmi->connector;
> +	struct cec_connector_info conn_info;
> +	struct cec_notifier *notifier;
>  
>  	connector->interlace_allowed = 1;
>  	connector->polled = DRM_CONNECTOR_POLL_HPD;
> @@ -2207,6 +2209,18 @@ static int dw_hdmi_bridge_attach(struct drm_bridge *bridge)
>  
>  	drm_connector_attach_encoder(connector, encoder);
>  
> +	cec_fill_conn_info_from_drm(&conn_info, connector);
> +
> +	notifier = cec_notifier_conn_register(hdmi->dev, NULL, &conn_info);
> +	if (!notifier)
> +		return -ENOMEM;
> +	/*
> +	 * Make sure that dw_hdmi_irq thread does see the notifier
> +	 * when it fully constructed.
> +	 */
> +	smp_wmb();
> +	hdmi->cec_notifier = notifier;
> +
>  	return 0;
>  }
>  
> @@ -2373,9 +2387,13 @@ static irqreturn_t dw_hdmi_irq(int irq, void *dev_id)
>  				       phy_stat & HDMI_PHY_HPD,
>  				       phy_stat & HDMI_PHY_RX_SENSE);
>  
> -		if ((phy_stat & (HDMI_PHY_RX_SENSE | HDMI_PHY_HPD)) == 0)
> -			cec_notifier_set_phys_addr(hdmi->cec_notifier,
> -						   CEC_PHYS_ADDR_INVALID);
> +		if ((phy_stat & (HDMI_PHY_RX_SENSE | HDMI_PHY_HPD)) == 0) {
> +			struct cec_notifier *notifier;
> +
> +			notifier = READ_ONCE(hdmi->cec_notifier);
> +			if (notifier)
> +				cec_notifier_phys_addr_invalidate(notifier);
> +		}
>  	}
>  
>  	if (intr_stat & HDMI_IH_PHY_STAT0_HPD) {
> @@ -2693,12 +2711,6 @@ __dw_hdmi_probe(struct platform_device *pdev,
>  	if (ret)
>  		goto err_iahb;
>  
> -	hdmi->cec_notifier = cec_notifier_get(dev);
> -	if (!hdmi->cec_notifier) {
> -		ret = -ENOMEM;
> -		goto err_iahb;
> -	}
> -
>  	/*
>  	 * To prevent overflows in HDMI_IH_FC_STAT2, set the clk regenerator
>  	 * N and cts values before enabling phy
> @@ -2796,9 +2808,6 @@ __dw_hdmi_probe(struct platform_device *pdev,
>  		hdmi->ddc = NULL;
>  	}
>  
> -	if (hdmi->cec_notifier)
> -		cec_notifier_put(hdmi->cec_notifier);
> -
>  	clk_disable_unprepare(hdmi->iahb_clk);
>  	if (hdmi->cec_clk)
>  		clk_disable_unprepare(hdmi->cec_clk);
> @@ -2820,8 +2829,7 @@ static void __dw_hdmi_remove(struct dw_hdmi *hdmi)
>  	/* Disable all interrupts */
>  	hdmi_writeb(hdmi, ~0, HDMI_IH_MUTE_PHY_STAT0);
>  
> -	if (hdmi->cec_notifier)
> -		cec_notifier_put(hdmi->cec_notifier);
> +	cec_notifier_conn_unregister(hdmi->cec_notifier);

Russell's review caused me to take another look at this series, and it made
wonder if cec_notifier_conn_unregister() shouldn't be called from bridge_detach?

Regards,

	Hans

>  
>  	clk_disable_unprepare(hdmi->iahb_clk);
>  	clk_disable_unprepare(hdmi->isfr_clk);
> 


^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [PATCH v6 3/8] tda9950: use cec_notifier_cec_adap_(un)register
  2019-08-13 11:32   ` Russell King - ARM Linux admin
@ 2019-08-13 11:44     ` Hans Verkuil
  0 siblings, 0 replies; 15+ messages in thread
From: Hans Verkuil @ 2019-08-13 11:44 UTC (permalink / raw)
  To: Russell King - ARM Linux admin, Dariusz Marcinkiewicz
  Cc: dri-devel, linux-media, David Airlie, Daniel Vetter,
	Hans Verkuil, Kate Stewart, Allison Randal, Thomas Gleixner,
	Kees Cook, Colin Ian King, open list

On 8/13/19 1:32 PM, Russell King - ARM Linux admin wrote:
> On Tue, Aug 13, 2019 at 01:02:35PM +0200, Dariusz Marcinkiewicz wrote:
>> Use the new cec_notifier_cec_adap_(un)register() functions to
>> (un)register the notifier for the CEC adapter.
>>
>> Signed-off-by: Dariusz Marcinkiewicz <darekm@google.com>
>> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
>> Tested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
>> ---
>>  drivers/gpu/drm/i2c/tda9950.c | 12 ++++++------
>>  1 file changed, 6 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i2c/tda9950.c b/drivers/gpu/drm/i2c/tda9950.c
>> index 8039fc0d83db4..a5a75bdeb7a5f 100644
>> --- a/drivers/gpu/drm/i2c/tda9950.c
>> +++ b/drivers/gpu/drm/i2c/tda9950.c
>> @@ -420,7 +420,8 @@ static int tda9950_probe(struct i2c_client *client,
>>  		priv->hdmi = glue->parent;
>>  
>>  	priv->adap = cec_allocate_adapter(&tda9950_cec_ops, priv, "tda9950",
>> -					  CEC_CAP_DEFAULTS,
>> +					  CEC_CAP_DEFAULTS |
>> +					  CEC_CAP_CONNECTOR_INFO,
>>  					  CEC_MAX_LOG_ADDRS);
>>  	if (IS_ERR(priv->adap))
>>  		return PTR_ERR(priv->adap);
>> @@ -457,13 +458,14 @@ static int tda9950_probe(struct i2c_client *client,
>>  	if (ret < 0)
>>  		return ret;
>>  
>> -	priv->notify = cec_notifier_get(priv->hdmi);
>> +	priv->notify = cec_notifier_cec_adap_register(priv->hdmi, NULL,
>> +						      priv->adap);
>>  	if (!priv->notify)
>>  		return -ENOMEM;
>>  
>>  	ret = cec_register_adapter(priv->adap, priv->hdmi);
>>  	if (ret < 0) {
>> -		cec_notifier_put(priv->notify);
>> +		cec_notifier_cec_adap_unregister(priv->notify);
>>  		return ret;
>>  	}
>>  
>> @@ -473,8 +475,6 @@ static int tda9950_probe(struct i2c_client *client,
>>  	 */
>>  	devm_remove_action(dev, tda9950_cec_del, priv);
>>  
>> -	cec_register_cec_notifier(priv->adap, priv->notify);
>> -
>>  	return 0;
>>  }
>>  
>> @@ -482,8 +482,8 @@ static int tda9950_remove(struct i2c_client *client)
>>  {
>>  	struct tda9950_priv *priv = i2c_get_clientdata(client);
>>  
>> +	cec_notifier_cec_adap_unregister(priv->notify);
>>  	cec_unregister_adapter(priv->adap);
>> -	cec_notifier_put(priv->notify);
> 
> It looks weird to have an unexpectedly different ordering of
> unregistration from the registration path - normally, unregistration
> is the reverse order of initialisation.
> 
> In the initialisation path, it seems that we register the notifier
> and _then_ the adapter.  Here, we unregister the notifier and then
> the adapter rather than what would normally be expected.  Why is
> this?  I suspect there will be drivers created that do this the
> "normal" way round, so if this is a requirement, it needs to be made
> plainly obvious.

It's not a requirement, it just feels better to do it in this order
since cec_unregister_adapter will in general also delete the adapter
(unless an application keeps the cec device open).

So the order is actually: allocate_adapter, then register notifier
and: unregister notifier, then unregister (and typically delete) adapter

Regards,

	Hans

> 
>>  
>>  	return 0;
>>  }
>> -- 
>> 2.23.0.rc1.153.gdeed80330f-goog
>>
>>
> 


^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [PATCH v6 7/8] drm: dw-hdmi: use cec_notifier_conn_(un)register
  2019-08-13 11:37   ` Hans Verkuil
@ 2019-08-14 10:49     ` Dariusz Marcinkiewicz
  0 siblings, 0 replies; 15+ messages in thread
From: Dariusz Marcinkiewicz @ 2019-08-14 10:49 UTC (permalink / raw)
  To: Hans Verkuil
  Cc: dri-devel, linux-media, Andrzej Hajda, Neil Armstrong,
	Laurent Pinchart, Jonas Karlman, Jernej Skrabec, David Airlie,
	Daniel Vetter, Sam Ravnborg, Douglas Anderson, open list

Hi.

On Tue, Aug 13, 2019 at 1:38 PM Hans Verkuil <hverkuil-cisco@xs4all.nl> wrote:
>
> Russell's review caused me to take another look at this series, and it made
> wonder if cec_notifier_conn_unregister() shouldn't be called from bridge_detach?
>
I've sent out v7 of the series where unregistration is done from bridge detach.

Regards.

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [PATCH v6 4/8] drm: tda998x: use cec_notifier_conn_(un)register
  2019-08-13 11:20   ` Russell King - ARM Linux admin
@ 2019-08-14 10:52     ` Dariusz Marcinkiewicz
  0 siblings, 0 replies; 15+ messages in thread
From: Dariusz Marcinkiewicz @ 2019-08-14 10:52 UTC (permalink / raw)
  To: Russell King - ARM Linux admin
  Cc: dri-devel, linux-media, Hans Verkuil, David Airlie,
	Daniel Vetter, open list

Hello.

On Tue, Aug 13, 2019 at 1:20 PM Russell King - ARM Linux admin
<linux@armlinux.org.uk> wrote:
>
> This also doesn't make sense: tda998x_destroy() is the opposite of
> tda998x_create().  However, tda998x_connector_destroy() is the
> opposite of tda998x_connector_create().
>
> By moving the CEC creation code into tda998x_connector_create(), you
> are creating the possibility for the following sequence to mess up
> CEC and leak:
>
>         tda998x_create()
>         tda998x_connector_create()
>         tda998x_connector_destroy()
>         tda998x_connector_create()
>         tda998x_connector_destroy()
>         tda998x_destroy()
>
> Anything you create in tda998x_connector_create() must be cleaned up
> by tda998x_connector_destroy().
>
Thank you.

I've just sent out another revision of the patch, where registration
and deregistration is symmetric. Please take a look.

Best regards.

^ permalink raw reply	[flat|nested] 15+ messages in thread

end of thread, back to index

Thread overview: 15+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-08-13 11:02 [PATCH v6 0/8] drm: cec: convert DRM drivers to the new notifier API Dariusz Marcinkiewicz
2019-08-13 11:02 ` [PATCH v6 1/8] drm/i915/intel_hdmi: use cec_notifier_conn_(un)register Dariusz Marcinkiewicz
2019-08-13 11:02 ` [PATCH v6 2/8] dw-hdmi-cec: use cec_notifier_cec_adap_(un)register Dariusz Marcinkiewicz
2019-08-13 11:02 ` [PATCH v6 3/8] tda9950: " Dariusz Marcinkiewicz
2019-08-13 11:32   ` Russell King - ARM Linux admin
2019-08-13 11:44     ` Hans Verkuil
2019-08-13 11:02 ` [PATCH v6 4/8] drm: tda998x: use cec_notifier_conn_(un)register Dariusz Marcinkiewicz
2019-08-13 11:20   ` Russell King - ARM Linux admin
2019-08-14 10:52     ` Dariusz Marcinkiewicz
2019-08-13 11:02 ` [PATCH v6 5/8] drm: sti: " Dariusz Marcinkiewicz
2019-08-13 11:02 ` [PATCH v6 6/8] drm: tegra: " Dariusz Marcinkiewicz
2019-08-13 11:02 ` [PATCH v6 7/8] drm: dw-hdmi: " Dariusz Marcinkiewicz
2019-08-13 11:37   ` Hans Verkuil
2019-08-14 10:49     ` Dariusz Marcinkiewicz
2019-08-13 11:02 ` [PATCH v6 8/8] drm: exynos: exynos_hdmi: " Dariusz Marcinkiewicz

Linux-Media Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-media/0 linux-media/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-media linux-media/ https://lore.kernel.org/linux-media \
		linux-media@vger.kernel.org linux-media@archiver.kernel.org
	public-inbox-index linux-media


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-media


AGPL code for this site: git clone https://public-inbox.org/ public-inbox