[PATCH v3 1/3] dt-bindings: connector: Add self-powered property

[PATCH v3 1/3] dt-bindings: connector: Add self-powered property

[Badhri Jagan Sridharan]

From USB_PD_R3_0
7.1.5 Response to Hard Resets
Device operation during and after a Hard Reset is defined as follows:
Self-powered devices Should Not disconnect from USB during a Hard Reset
(see Section 9.1.2).
Bus powered devices will disconnect from USB during a Hard Reset due to the
loss of their power source.

Therefore it is necessary to know whether the port belongs to
a device which is self powered or bus powered. This change
adds "self-powered" flag to the connector class which present indicates
that the port belongs to a device that is self powered. Else it is
bus powered usb device.

Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
-------
Changes is v3:
- Rebase on top of usb-next
- no change w.r.t to this patch. Same as previous versions.

No v2 version as the patch was introduced there.

---
 Documentation/devicetree/bindings/connector/usb-connector.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/connector/usb-connector.txt b/Documentation/devicetree/bindings/connector/usb-connector.txt
index d90e17e2428b..a9a2f2fc44f2 100644
--- a/Documentation/devicetree/bindings/connector/usb-connector.txt
+++ b/Documentation/devicetree/bindings/connector/usb-connector.txt
@@ -14,6 +14,8 @@ Optional properties:
 - label: symbolic name for the connector,
 - type: size of the connector, should be specified in case of USB-A, USB-B
   non-fullsize connectors: "mini", "micro".
+- self-powered: Set this property if the usb device that has its own power
+  source.
 
 Optional properties for usb-c-connector:
 - power-role: should be one of "source", "sink" or "dual"(DRP) if typec
-- 
2.19.0.605.g01d371f741-goog

[v3,1/3] dt-bindings: connector: Add self-powered property

[Badhri Jagan Sridharan]

From USB_PD_R3_0
7.1.5 Response to Hard Resets
Device operation during and after a Hard Reset is defined as follows:
Self-powered devices Should Not disconnect from USB during a Hard Reset
(see Section 9.1.2).
Bus powered devices will disconnect from USB during a Hard Reset due to the
loss of their power source.

Therefore it is necessary to know whether the port belongs to
a device which is self powered or bus powered. This change
adds "self-powered" flag to the connector class which present indicates
that the port belongs to a device that is self powered. Else it is
bus powered usb device.

Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
-------
Changes is v3:
- Rebase on top of usb-next
- no change w.r.t to this patch. Same as previous versions.

No v2 version as the patch was introduced there.
---
 Documentation/devicetree/bindings/connector/usb-connector.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/connector/usb-connector.txt b/Documentation/devicetree/bindings/connector/usb-connector.txt
index d90e17e2428b..a9a2f2fc44f2 100644
--- a/Documentation/devicetree/bindings/connector/usb-connector.txt
+++ b/Documentation/devicetree/bindings/connector/usb-connector.txt
@@ -14,6 +14,8 @@ Optional properties:
 - label: symbolic name for the connector,
 - type: size of the connector, should be specified in case of USB-A, USB-B
   non-fullsize connectors: "mini", "micro".
+- self-powered: Set this property if the usb device that has its own power
+  source.
 
 Optional properties for usb-c-connector:
 - power-role: should be one of "source", "sink" or "dual"(DRP) if typec

[PATCH v3 1/3] dt-bindings: connector: Add self-powered property

[Badhri Jagan Sridharan]

>From USB_PD_R3_0
7.1.5 Response to Hard Resets
Device operation during and after a Hard Reset is defined as follows:
Self-powered devices Should Not disconnect from USB during a Hard Reset
(see Section 9.1.2).
Bus powered devices will disconnect from USB during a Hard Reset due to the
loss of their power source.

Therefore it is necessary to know whether the port belongs to
a device which is self powered or bus powered. This change
adds "self-powered" flag to the connector class which present indicates
that the port belongs to a device that is self powered. Else it is
bus powered usb device.

Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
-------
Changes is v3:
- Rebase on top of usb-next
- no change w.r.t to this patch. Same as previous versions.

No v2 version as the patch was introduced there.

---
 Documentation/devicetree/bindings/connector/usb-connector.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/connector/usb-connector.txt b/Documentation/devicetree/bindings/connector/usb-connector.txt
index d90e17e2428b..a9a2f2fc44f2 100644
--- a/Documentation/devicetree/bindings/connector/usb-connector.txt
+++ b/Documentation/devicetree/bindings/connector/usb-connector.txt
@@ -14,6 +14,8 @@ Optional properties:
 - label: symbolic name for the connector,
 - type: size of the connector, should be specified in case of USB-A, USB-B
   non-fullsize connectors: "mini", "micro".
+- self-powered: Set this property if the usb device that has its own power
+  source.
 
 Optional properties for usb-c-connector:
 - power-role: should be one of "source", "sink" or "dual"(DRP) if typec
-- 
2.19.0.605.g01d371f741-goog

[PATCH v3 2/3] usb: typec: tcpm: Do not disconnect link for self powered devices

[Badhri Jagan Sridharan]

During HARD_RESET the data link is disconnected.
For self powered device, the spec is advising against doing that.

From USB_PD_R3_0
7.1.5 Response to Hard Resets
Device operation during and after a Hard Reset is defined as follows:
Self-powered devices Should Not disconnect from USB during a Hard Reset
(see Section 9.1.2).
Bus powered devices will disconnect from USB during a Hard Reset due to the
loss of their power source.

Tackle this by letting TCPM know whether the device is self or bus powered.

This overcomes unnecessary port disconnections from hard reset.
Also, speeds up the enumeration time when connected to Type-A ports.

Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
---------
Version history:
V3:
Rebase on top of usb-next

V2:
Based on feedback from heikki.krogerus@linux.intel.com
- self_powered added to the struct tcpm_port which is populated from
  a. "connector" node of the device tree in tcpm_fw_get_caps()
  b. "self_powered" node of the tcpc_config in tcpm_copy_caps

Based on feedbase from linux@roeck-us.net
- Code was refactored
- SRC_HARD_RESET_VBUS_OFF sets the link state to false based
  on self_powered flag

V1 located here:
https://lkml.org/lkml/2018/9/13/94
---
 drivers/usb/typec/tcpm/tcpm.c | 12 ++++++++++--
 include/linux/usb/tcpm.h      |  1 +
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 4f1f4215f3d6..c3ac0e46106b 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -317,6 +317,9 @@ struct tcpm_port {
 	/* Deadline in jiffies to exit src_try_wait state */
 	unsigned long max_wait;
 
+	/* port belongs to a self powered device */
+	bool self_powered;
+
 #ifdef CONFIG_DEBUG_FS
 	struct dentry *dentry;
 	struct mutex logbuffer_lock;	/* log buffer access lock */
@@ -3257,7 +3260,8 @@ static void run_state_machine(struct tcpm_port *port)
 	case SRC_HARD_RESET_VBUS_OFF:
 		tcpm_set_vconn(port, true);
 		tcpm_set_vbus(port, false);
-		tcpm_set_roles(port, false, TYPEC_SOURCE, TYPEC_HOST);
+		tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
+			       TYPEC_HOST);
 		tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
 		break;
 	case SRC_HARD_RESET_VBUS_ON:
@@ -3270,7 +3274,8 @@ static void run_state_machine(struct tcpm_port *port)
 		memset(&port->pps_data, 0, sizeof(port->pps_data));
 		tcpm_set_vconn(port, false);
 		tcpm_set_charge(port, false);
-		tcpm_set_roles(port, false, TYPEC_SINK, TYPEC_DEVICE);
+		tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
+			       TYPEC_DEVICE);
 		/*
 		 * VBUS may or may not toggle, depending on the adapter.
 		 * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
@@ -4409,6 +4414,8 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,
 		return -EINVAL;
 	port->operating_snk_mw = mw / 1000;
 
+	port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
+
 	return 0;
 }
 
@@ -4717,6 +4724,7 @@ static int tcpm_copy_caps(struct tcpm_port *port,
 	port->typec_caps.prefer_role = tcfg->default_role;
 	port->typec_caps.type = tcfg->type;
 	port->typec_caps.data = tcfg->data;
+	port->self_powered = port->tcpc->config->self_powered;
 
 	return 0;
 }
diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
index 7e7fbfb84e8e..50c74a77db55 100644
--- a/include/linux/usb/tcpm.h
+++ b/include/linux/usb/tcpm.h
@@ -89,6 +89,7 @@ struct tcpc_config {
 	enum typec_port_data data;
 	enum typec_role default_role;
 	bool try_role_hw;	/* try.{src,snk} implemented in hardware */
+	bool self_powered;	/* port belongs to a self powered device */
 
 	const struct typec_altmode_desc *alt_modes;
 };
-- 
2.19.0.605.g01d371f741-goog

[v3,2/3] usb: typec: tcpm: Do not disconnect link for self powered devices

[Badhri Jagan Sridharan]

During HARD_RESET the data link is disconnected.
For self powered device, the spec is advising against doing that.

From USB_PD_R3_0
7.1.5 Response to Hard Resets
Device operation during and after a Hard Reset is defined as follows:
Self-powered devices Should Not disconnect from USB during a Hard Reset
(see Section 9.1.2).
Bus powered devices will disconnect from USB during a Hard Reset due to the
loss of their power source.

Tackle this by letting TCPM know whether the device is self or bus powered.

This overcomes unnecessary port disconnections from hard reset.
Also, speeds up the enumeration time when connected to Type-A ports.

Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
---------
Version history:
V3:
Rebase on top of usb-next

V2:
Based on feedback from heikki.krogerus@linux.intel.com
- self_powered added to the struct tcpm_port which is populated from
  a. "connector" node of the device tree in tcpm_fw_get_caps()
  b. "self_powered" node of the tcpc_config in tcpm_copy_caps

Based on feedbase from linux@roeck-us.net
- Code was refactored
- SRC_HARD_RESET_VBUS_OFF sets the link state to false based
  on self_powered flag

V1 located here:
https://lkml.org/lkml/2018/9/13/94
---
 drivers/usb/typec/tcpm/tcpm.c | 12 ++++++++++--
 include/linux/usb/tcpm.h      |  1 +
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 4f1f4215f3d6..c3ac0e46106b 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -317,6 +317,9 @@ struct tcpm_port {
 	/* Deadline in jiffies to exit src_try_wait state */
 	unsigned long max_wait;
 
+	/* port belongs to a self powered device */
+	bool self_powered;
+
 #ifdef CONFIG_DEBUG_FS
 	struct dentry *dentry;
 	struct mutex logbuffer_lock;	/* log buffer access lock */
@@ -3257,7 +3260,8 @@ static void run_state_machine(struct tcpm_port *port)
 	case SRC_HARD_RESET_VBUS_OFF:
 		tcpm_set_vconn(port, true);
 		tcpm_set_vbus(port, false);
-		tcpm_set_roles(port, false, TYPEC_SOURCE, TYPEC_HOST);
+		tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
+			       TYPEC_HOST);
 		tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
 		break;
 	case SRC_HARD_RESET_VBUS_ON:
@@ -3270,7 +3274,8 @@ static void run_state_machine(struct tcpm_port *port)
 		memset(&port->pps_data, 0, sizeof(port->pps_data));
 		tcpm_set_vconn(port, false);
 		tcpm_set_charge(port, false);
-		tcpm_set_roles(port, false, TYPEC_SINK, TYPEC_DEVICE);
+		tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
+			       TYPEC_DEVICE);
 		/*
 		 * VBUS may or may not toggle, depending on the adapter.
 		 * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
@@ -4409,6 +4414,8 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,
 		return -EINVAL;
 	port->operating_snk_mw = mw / 1000;
 
+	port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
+
 	return 0;
 }
 
@@ -4717,6 +4724,7 @@ static int tcpm_copy_caps(struct tcpm_port *port,
 	port->typec_caps.prefer_role = tcfg->default_role;
 	port->typec_caps.type = tcfg->type;
 	port->typec_caps.data = tcfg->data;
+	port->self_powered = port->tcpc->config->self_powered;
 
 	return 0;
 }
diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
index 7e7fbfb84e8e..50c74a77db55 100644
--- a/include/linux/usb/tcpm.h
+++ b/include/linux/usb/tcpm.h
@@ -89,6 +89,7 @@ struct tcpc_config {
 	enum typec_port_data data;
 	enum typec_role default_role;
 	bool try_role_hw;	/* try.{src,snk} implemented in hardware */
+	bool self_powered;	/* port belongs to a self powered device */
 
 	const struct typec_altmode_desc *alt_modes;
 };

[PATCH v3 2/3] usb: typec: tcpm: Do not disconnect link for self powered devices

[Badhri Jagan Sridharan]

During HARD_RESET the data link is disconnected.
For self powered device, the spec is advising against doing that.

>From USB_PD_R3_0
7.1.5 Response to Hard Resets
Device operation during and after a Hard Reset is defined as follows:
Self-powered devices Should Not disconnect from USB during a Hard Reset
(see Section 9.1.2).
Bus powered devices will disconnect from USB during a Hard Reset due to the
loss of their power source.

Tackle this by letting TCPM know whether the device is self or bus powered.

This overcomes unnecessary port disconnections from hard reset.
Also, speeds up the enumeration time when connected to Type-A ports.

Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
---------
Version history:
V3:
Rebase on top of usb-next

V2:
Based on feedback from heikki.krogerus@linux.intel.com
- self_powered added to the struct tcpm_port which is populated from
  a. "connector" node of the device tree in tcpm_fw_get_caps()
  b. "self_powered" node of the tcpc_config in tcpm_copy_caps

Based on feedbase from linux@roeck-us.net
- Code was refactored
- SRC_HARD_RESET_VBUS_OFF sets the link state to false based
  on self_powered flag

V1 located here:
https://lkml.org/lkml/2018/9/13/94
---
 drivers/usb/typec/tcpm/tcpm.c | 12 ++++++++++--
 include/linux/usb/tcpm.h      |  1 +
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 4f1f4215f3d6..c3ac0e46106b 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -317,6 +317,9 @@ struct tcpm_port {
 	/* Deadline in jiffies to exit src_try_wait state */
 	unsigned long max_wait;
 
+	/* port belongs to a self powered device */
+	bool self_powered;
+
 #ifdef CONFIG_DEBUG_FS
 	struct dentry *dentry;
 	struct mutex logbuffer_lock;	/* log buffer access lock */
@@ -3257,7 +3260,8 @@ static void run_state_machine(struct tcpm_port *port)
 	case SRC_HARD_RESET_VBUS_OFF:
 		tcpm_set_vconn(port, true);
 		tcpm_set_vbus(port, false);
-		tcpm_set_roles(port, false, TYPEC_SOURCE, TYPEC_HOST);
+		tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
+			       TYPEC_HOST);
 		tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
 		break;
 	case SRC_HARD_RESET_VBUS_ON:
@@ -3270,7 +3274,8 @@ static void run_state_machine(struct tcpm_port *port)
 		memset(&port->pps_data, 0, sizeof(port->pps_data));
 		tcpm_set_vconn(port, false);
 		tcpm_set_charge(port, false);
-		tcpm_set_roles(port, false, TYPEC_SINK, TYPEC_DEVICE);
+		tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
+			       TYPEC_DEVICE);
 		/*
 		 * VBUS may or may not toggle, depending on the adapter.
 		 * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
@@ -4409,6 +4414,8 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,
 		return -EINVAL;
 	port->operating_snk_mw = mw / 1000;
 
+	port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
+
 	return 0;
 }
 
@@ -4717,6 +4724,7 @@ static int tcpm_copy_caps(struct tcpm_port *port,
 	port->typec_caps.prefer_role = tcfg->default_role;
 	port->typec_caps.type = tcfg->type;
 	port->typec_caps.data = tcfg->data;
+	port->self_powered = port->tcpc->config->self_powered;
 
 	return 0;
 }
diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
index 7e7fbfb84e8e..50c74a77db55 100644
--- a/include/linux/usb/tcpm.h
+++ b/include/linux/usb/tcpm.h
@@ -89,6 +89,7 @@ struct tcpc_config {
 	enum typec_port_data data;
 	enum typec_role default_role;
 	bool try_role_hw;	/* try.{src,snk} implemented in hardware */
+	bool self_powered;	/* port belongs to a self powered device */
 
 	const struct typec_altmode_desc *alt_modes;
 };
-- 
2.19.0.605.g01d371f741-goog

Re: [PATCH v3 2/3] usb: typec: tcpm: Do not disconnect link for self powered devices

[Heikki Krogerus]

On Mon, Oct 01, 2018 at 12:45:00PM -0700, Badhri Jagan Sridharan wrote:
> During HARD_RESET the data link is disconnected.
> For self powered device, the spec is advising against doing that.
> 
> >From USB_PD_R3_0
> 7.1.5 Response to Hard Resets
> Device operation during and after a Hard Reset is defined as follows:
> Self-powered devices Should Not disconnect from USB during a Hard Reset
> (see Section 9.1.2).
> Bus powered devices will disconnect from USB during a Hard Reset due to the
> loss of their power source.
> 
> Tackle this by letting TCPM know whether the device is self or bus powered.
> 
> This overcomes unnecessary port disconnections from hard reset.
> Also, speeds up the enumeration time when connected to Type-A ports.
> 
> Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

> ---------
> Version history:
> V3:
> Rebase on top of usb-next
> 
> V2:
> Based on feedback from heikki.krogerus@linux.intel.com
> - self_powered added to the struct tcpm_port which is populated from
>   a. "connector" node of the device tree in tcpm_fw_get_caps()
>   b. "self_powered" node of the tcpc_config in tcpm_copy_caps
> 
> Based on feedbase from linux@roeck-us.net
> - Code was refactored
> - SRC_HARD_RESET_VBUS_OFF sets the link state to false based
>   on self_powered flag
> 
> V1 located here:
> https://lkml.org/lkml/2018/9/13/94
> ---
>  drivers/usb/typec/tcpm/tcpm.c | 12 ++++++++++--
>  include/linux/usb/tcpm.h      |  1 +
>  2 files changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 4f1f4215f3d6..c3ac0e46106b 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -317,6 +317,9 @@ struct tcpm_port {
>  	/* Deadline in jiffies to exit src_try_wait state */
>  	unsigned long max_wait;
>  
> +	/* port belongs to a self powered device */
> +	bool self_powered;
> +
>  #ifdef CONFIG_DEBUG_FS
>  	struct dentry *dentry;
>  	struct mutex logbuffer_lock;	/* log buffer access lock */
> @@ -3257,7 +3260,8 @@ static void run_state_machine(struct tcpm_port *port)
>  	case SRC_HARD_RESET_VBUS_OFF:
>  		tcpm_set_vconn(port, true);
>  		tcpm_set_vbus(port, false);
> -		tcpm_set_roles(port, false, TYPEC_SOURCE, TYPEC_HOST);
> +		tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
> +			       TYPEC_HOST);
>  		tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
>  		break;
>  	case SRC_HARD_RESET_VBUS_ON:
> @@ -3270,7 +3274,8 @@ static void run_state_machine(struct tcpm_port *port)
>  		memset(&port->pps_data, 0, sizeof(port->pps_data));
>  		tcpm_set_vconn(port, false);
>  		tcpm_set_charge(port, false);
> -		tcpm_set_roles(port, false, TYPEC_SINK, TYPEC_DEVICE);
> +		tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
> +			       TYPEC_DEVICE);
>  		/*
>  		 * VBUS may or may not toggle, depending on the adapter.
>  		 * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
> @@ -4409,6 +4414,8 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,
>  		return -EINVAL;
>  	port->operating_snk_mw = mw / 1000;
>  
> +	port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
> +
>  	return 0;
>  }
>  
> @@ -4717,6 +4724,7 @@ static int tcpm_copy_caps(struct tcpm_port *port,
>  	port->typec_caps.prefer_role = tcfg->default_role;
>  	port->typec_caps.type = tcfg->type;
>  	port->typec_caps.data = tcfg->data;
> +	port->self_powered = port->tcpc->config->self_powered;
>  
>  	return 0;
>  }
> diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
> index 7e7fbfb84e8e..50c74a77db55 100644
> --- a/include/linux/usb/tcpm.h
> +++ b/include/linux/usb/tcpm.h
> @@ -89,6 +89,7 @@ struct tcpc_config {
>  	enum typec_port_data data;
>  	enum typec_role default_role;
>  	bool try_role_hw;	/* try.{src,snk} implemented in hardware */
> +	bool self_powered;	/* port belongs to a self powered device */
>  
>  	const struct typec_altmode_desc *alt_modes;
>  };
> -- 
> 2.19.0.605.g01d371f741-goog

thanks,

-- 
heikki

[v3,2/3] usb: typec: tcpm: Do not disconnect link for self powered devices

[Heikki Krogerus]

On Mon, Oct 01, 2018 at 12:45:00PM -0700, Badhri Jagan Sridharan wrote:
> During HARD_RESET the data link is disconnected.
> For self powered device, the spec is advising against doing that.
> 
> >From USB_PD_R3_0
> 7.1.5 Response to Hard Resets
> Device operation during and after a Hard Reset is defined as follows:
> Self-powered devices Should Not disconnect from USB during a Hard Reset
> (see Section 9.1.2).
> Bus powered devices will disconnect from USB during a Hard Reset due to the
> loss of their power source.
> 
> Tackle this by letting TCPM know whether the device is self or bus powered.
> 
> This overcomes unnecessary port disconnections from hard reset.
> Also, speeds up the enumeration time when connected to Type-A ports.
> 
> Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

> ---------
> Version history:
> V3:
> Rebase on top of usb-next
> 
> V2:
> Based on feedback from heikki.krogerus@linux.intel.com
> - self_powered added to the struct tcpm_port which is populated from
>   a. "connector" node of the device tree in tcpm_fw_get_caps()
>   b. "self_powered" node of the tcpc_config in tcpm_copy_caps
> 
> Based on feedbase from linux@roeck-us.net
> - Code was refactored
> - SRC_HARD_RESET_VBUS_OFF sets the link state to false based
>   on self_powered flag
> 
> V1 located here:
> https://lkml.org/lkml/2018/9/13/94
> ---
>  drivers/usb/typec/tcpm/tcpm.c | 12 ++++++++++--
>  include/linux/usb/tcpm.h      |  1 +
>  2 files changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 4f1f4215f3d6..c3ac0e46106b 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -317,6 +317,9 @@ struct tcpm_port {
>  	/* Deadline in jiffies to exit src_try_wait state */
>  	unsigned long max_wait;
>  
> +	/* port belongs to a self powered device */
> +	bool self_powered;
> +
>  #ifdef CONFIG_DEBUG_FS
>  	struct dentry *dentry;
>  	struct mutex logbuffer_lock;	/* log buffer access lock */
> @@ -3257,7 +3260,8 @@ static void run_state_machine(struct tcpm_port *port)
>  	case SRC_HARD_RESET_VBUS_OFF:
>  		tcpm_set_vconn(port, true);
>  		tcpm_set_vbus(port, false);
> -		tcpm_set_roles(port, false, TYPEC_SOURCE, TYPEC_HOST);
> +		tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
> +			       TYPEC_HOST);
>  		tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
>  		break;
>  	case SRC_HARD_RESET_VBUS_ON:
> @@ -3270,7 +3274,8 @@ static void run_state_machine(struct tcpm_port *port)
>  		memset(&port->pps_data, 0, sizeof(port->pps_data));
>  		tcpm_set_vconn(port, false);
>  		tcpm_set_charge(port, false);
> -		tcpm_set_roles(port, false, TYPEC_SINK, TYPEC_DEVICE);
> +		tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
> +			       TYPEC_DEVICE);
>  		/*
>  		 * VBUS may or may not toggle, depending on the adapter.
>  		 * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
> @@ -4409,6 +4414,8 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,
>  		return -EINVAL;
>  	port->operating_snk_mw = mw / 1000;
>  
> +	port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
> +
>  	return 0;
>  }
>  
> @@ -4717,6 +4724,7 @@ static int tcpm_copy_caps(struct tcpm_port *port,
>  	port->typec_caps.prefer_role = tcfg->default_role;
>  	port->typec_caps.type = tcfg->type;
>  	port->typec_caps.data = tcfg->data;
> +	port->self_powered = port->tcpc->config->self_powered;
>  
>  	return 0;
>  }
> diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
> index 7e7fbfb84e8e..50c74a77db55 100644
> --- a/include/linux/usb/tcpm.h
> +++ b/include/linux/usb/tcpm.h
> @@ -89,6 +89,7 @@ struct tcpc_config {
>  	enum typec_port_data data;
>  	enum typec_role default_role;
>  	bool try_role_hw;	/* try.{src,snk} implemented in hardware */
> +	bool self_powered;	/* port belongs to a self powered device */
>  
>  	const struct typec_altmode_desc *alt_modes;
>  };
> -- 
> 2.19.0.605.g01d371f741-goog

thanks,

[PATCH v3 3/3] usb: typec: tcpm: charge current handling for sink during hard reset

[Badhri Jagan Sridharan]

During the initial connect to a non-pd port, sink would hard reset
twice before deeming that the port partner is non-pd. TCPM sets the
the charge path to false during the hard reset. This causes unnecessary
connects/disconnects of charge path and makes port take longer to
charge from the non-pd ports. Avoid this by not setting the charge path
to false unless the partner has already identified to be pd capable.

When partner is a pd port, set the charge path to false in
SNK_HARD_RESET_SINK_OFF. Set the current limits to default value based
of CC pull up and resume the charge path when port enters
SNK_HARD_RESET_SINK_ON.

Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>

--------
Changes in V3:
Rebase on top of usb-next

Changes in V2:
Based on feedback of jackp@codeaurora.org
- vsafe_5v_hard_reset flag from tcpc_config is removed
- Patch only differentiates between pd port partner and non-pd port
partner

V1 version of the patch is here:
https://lkml.org/lkml/2018/9/14/11
---
 drivers/usb/typec/tcpm/tcpm.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index c3ac0e46106b..c25a69922ee6 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -3273,7 +3273,8 @@ static void run_state_machine(struct tcpm_port *port)
 	case SNK_HARD_RESET_SINK_OFF:
 		memset(&port->pps_data, 0, sizeof(port->pps_data));
 		tcpm_set_vconn(port, false);
-		tcpm_set_charge(port, false);
+		if (port->pd_capable)
+			tcpm_set_charge(port, false);
 		tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
 			       TYPEC_DEVICE);
 		/*
@@ -3305,6 +3306,12 @@ static void run_state_machine(struct tcpm_port *port)
 		 * Similar, dual-mode ports in source mode should transition
 		 * to PE_SNK_Transition_to_default.
 		 */
+		if (port->pd_capable) {
+			tcpm_set_current_limit(port,
+					       tcpm_get_current_limit(port),
+					       5000);
+			tcpm_set_charge(port, true);
+		}
 		tcpm_set_attached_state(port, true);
 		tcpm_set_state(port, SNK_STARTUP, 0);
 		break;
-- 
2.19.0.605.g01d371f741-goog

[v3,3/3] usb: typec: tcpm: charge current handling for sink during hard reset

[Badhri Jagan Sridharan]

During the initial connect to a non-pd port, sink would hard reset
twice before deeming that the port partner is non-pd. TCPM sets the
the charge path to false during the hard reset. This causes unnecessary
connects/disconnects of charge path and makes port take longer to
charge from the non-pd ports. Avoid this by not setting the charge path
to false unless the partner has already identified to be pd capable.

When partner is a pd port, set the charge path to false in
SNK_HARD_RESET_SINK_OFF. Set the current limits to default value based
of CC pull up and resume the charge path when port enters
SNK_HARD_RESET_SINK_ON.

Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>

--------
Changes in V3:
Rebase on top of usb-next

Changes in V2:
Based on feedback of jackp@codeaurora.org
- vsafe_5v_hard_reset flag from tcpc_config is removed
- Patch only differentiates between pd port partner and non-pd port
partner

V1 version of the patch is here:
https://lkml.org/lkml/2018/9/14/11
---
 drivers/usb/typec/tcpm/tcpm.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index c3ac0e46106b..c25a69922ee6 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -3273,7 +3273,8 @@ static void run_state_machine(struct tcpm_port *port)
 	case SNK_HARD_RESET_SINK_OFF:
 		memset(&port->pps_data, 0, sizeof(port->pps_data));
 		tcpm_set_vconn(port, false);
-		tcpm_set_charge(port, false);
+		if (port->pd_capable)
+			tcpm_set_charge(port, false);
 		tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
 			       TYPEC_DEVICE);
 		/*
@@ -3305,6 +3306,12 @@ static void run_state_machine(struct tcpm_port *port)
 		 * Similar, dual-mode ports in source mode should transition
 		 * to PE_SNK_Transition_to_default.
 		 */
+		if (port->pd_capable) {
+			tcpm_set_current_limit(port,
+					       tcpm_get_current_limit(port),
+					       5000);
+			tcpm_set_charge(port, true);
+		}
 		tcpm_set_attached_state(port, true);
 		tcpm_set_state(port, SNK_STARTUP, 0);
 		break;

Re: [PATCH v3 3/3] usb: typec: tcpm: charge current handling for sink during hard reset

[Rob Herring]

On Mon,  1 Oct 2018 12:45:01 -0700, Badhri Jagan Sridharan wrote:
> During the initial connect to a non-pd port, sink would hard reset
> twice before deeming that the port partner is non-pd. TCPM sets the
> the charge path to false during the hard reset. This causes unnecessary
> connects/disconnects of charge path and makes port take longer to
> charge from the non-pd ports. Avoid this by not setting the charge path
> to false unless the partner has already identified to be pd capable.
> 
> When partner is a pd port, set the charge path to false in
> SNK_HARD_RESET_SINK_OFF. Set the current limits to default value based
> of CC pull up and resume the charge path when port enters
> SNK_HARD_RESET_SINK_ON.
> 
> Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
> 
> --------
> Changes in V3:
> Rebase on top of usb-next
> 
> Changes in V2:
> Based on feedback of jackp@codeaurora.org
> - vsafe_5v_hard_reset flag from tcpc_config is removed
> - Patch only differentiates between pd port partner and non-pd port
> partner
> 
> V1 version of the patch is here:
> https://lkml.org/lkml/2018/9/14/11
> ---
>  drivers/usb/typec/tcpm/tcpm.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 

Reviewed-by: Rob Herring <robh@kernel.org>

[v3,3/3] usb: typec: tcpm: charge current handling for sink during hard reset

[Rob Herring]

On Mon,  1 Oct 2018 12:45:01 -0700, Badhri Jagan Sridharan wrote:
> During the initial connect to a non-pd port, sink would hard reset
> twice before deeming that the port partner is non-pd. TCPM sets the
> the charge path to false during the hard reset. This causes unnecessary
> connects/disconnects of charge path and makes port take longer to
> charge from the non-pd ports. Avoid this by not setting the charge path
> to false unless the partner has already identified to be pd capable.
> 
> When partner is a pd port, set the charge path to false in
> SNK_HARD_RESET_SINK_OFF. Set the current limits to default value based
> of CC pull up and resume the charge path when port enters
> SNK_HARD_RESET_SINK_ON.
> 
> Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
> 
> --------
> Changes in V3:
> Rebase on top of usb-next
> 
> Changes in V2:
> Based on feedback of jackp@codeaurora.org
> - vsafe_5v_hard_reset flag from tcpc_config is removed
> - Patch only differentiates between pd port partner and non-pd port
> partner
> 
> V1 version of the patch is here:
> https://lkml.org/lkml/2018/9/14/11
> ---
>  drivers/usb/typec/tcpm/tcpm.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 

Reviewed-by: Rob Herring <robh@kernel.org>

Re: [PATCH v3 3/3] usb: typec: tcpm: charge current handling for sink during hard reset

[Rob Herring]

On Mon,  1 Oct 2018 12:45:01 -0700, Badhri Jagan Sridharan wrote:
> During the initial connect to a non-pd port, sink would hard reset
> twice before deeming that the port partner is non-pd. TCPM sets the
> the charge path to false during the hard reset. This causes unnecessary
> connects/disconnects of charge path and makes port take longer to
> charge from the non-pd ports. Avoid this by not setting the charge path
> to false unless the partner has already identified to be pd capable.
> 
> When partner is a pd port, set the charge path to false in
> SNK_HARD_RESET_SINK_OFF. Set the current limits to default value based
> of CC pull up and resume the charge path when port enters
> SNK_HARD_RESET_SINK_ON.
> 
> Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
> 
> --------
> Changes in V3:
> Rebase on top of usb-next
> 
> Changes in V2:
> Based on feedback of jackp@codeaurora.org
> - vsafe_5v_hard_reset flag from tcpc_config is removed
> - Patch only differentiates between pd port partner and non-pd port
> partner
> 
> V1 version of the patch is here:
> https://lkml.org/lkml/2018/9/14/11
> ---
>  drivers/usb/typec/tcpm/tcpm.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 

Reviewed-by: Rob Herring <robh@kernel.org>

Re: [PATCH v3 3/3] usb: typec: tcpm: charge current handling for sink during hard reset

[Heikki Krogerus]

On Mon, Oct 01, 2018 at 12:45:01PM -0700, Badhri Jagan Sridharan wrote:
> During the initial connect to a non-pd port, sink would hard reset
> twice before deeming that the port partner is non-pd. TCPM sets the
> the charge path to false during the hard reset. This causes unnecessary
> connects/disconnects of charge path and makes port take longer to
> charge from the non-pd ports. Avoid this by not setting the charge path
> to false unless the partner has already identified to be pd capable.
> 
> When partner is a pd port, set the charge path to false in
> SNK_HARD_RESET_SINK_OFF. Set the current limits to default value based
> of CC pull up and resume the charge path when port enters
> SNK_HARD_RESET_SINK_ON.
> 
> Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

> --------
> Changes in V3:
> Rebase on top of usb-next
> 
> Changes in V2:
> Based on feedback of jackp@codeaurora.org
> - vsafe_5v_hard_reset flag from tcpc_config is removed
> - Patch only differentiates between pd port partner and non-pd port
> partner
> 
> V1 version of the patch is here:
> https://lkml.org/lkml/2018/9/14/11
> ---
>  drivers/usb/typec/tcpm/tcpm.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index c3ac0e46106b..c25a69922ee6 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -3273,7 +3273,8 @@ static void run_state_machine(struct tcpm_port *port)
>  	case SNK_HARD_RESET_SINK_OFF:
>  		memset(&port->pps_data, 0, sizeof(port->pps_data));
>  		tcpm_set_vconn(port, false);
> -		tcpm_set_charge(port, false);
> +		if (port->pd_capable)
> +			tcpm_set_charge(port, false);
>  		tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
>  			       TYPEC_DEVICE);
>  		/*
> @@ -3305,6 +3306,12 @@ static void run_state_machine(struct tcpm_port *port)
>  		 * Similar, dual-mode ports in source mode should transition
>  		 * to PE_SNK_Transition_to_default.
>  		 */
> +		if (port->pd_capable) {
> +			tcpm_set_current_limit(port,
> +					       tcpm_get_current_limit(port),
> +					       5000);
> +			tcpm_set_charge(port, true);
> +		}
>  		tcpm_set_attached_state(port, true);
>  		tcpm_set_state(port, SNK_STARTUP, 0);
>  		break;
> -- 
> 2.19.0.605.g01d371f741-goog

thanks,

-- 
heikki

[v3,3/3] usb: typec: tcpm: charge current handling for sink during hard reset

[Heikki Krogerus]

On Mon, Oct 01, 2018 at 12:45:01PM -0700, Badhri Jagan Sridharan wrote:
> During the initial connect to a non-pd port, sink would hard reset
> twice before deeming that the port partner is non-pd. TCPM sets the
> the charge path to false during the hard reset. This causes unnecessary
> connects/disconnects of charge path and makes port take longer to
> charge from the non-pd ports. Avoid this by not setting the charge path
> to false unless the partner has already identified to be pd capable.
> 
> When partner is a pd port, set the charge path to false in
> SNK_HARD_RESET_SINK_OFF. Set the current limits to default value based
> of CC pull up and resume the charge path when port enters
> SNK_HARD_RESET_SINK_ON.
> 
> Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

> --------
> Changes in V3:
> Rebase on top of usb-next
> 
> Changes in V2:
> Based on feedback of jackp@codeaurora.org
> - vsafe_5v_hard_reset flag from tcpc_config is removed
> - Patch only differentiates between pd port partner and non-pd port
> partner
> 
> V1 version of the patch is here:
> https://lkml.org/lkml/2018/9/14/11
> ---
>  drivers/usb/typec/tcpm/tcpm.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index c3ac0e46106b..c25a69922ee6 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -3273,7 +3273,8 @@ static void run_state_machine(struct tcpm_port *port)
>  	case SNK_HARD_RESET_SINK_OFF:
>  		memset(&port->pps_data, 0, sizeof(port->pps_data));
>  		tcpm_set_vconn(port, false);
> -		tcpm_set_charge(port, false);
> +		if (port->pd_capable)
> +			tcpm_set_charge(port, false);
>  		tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
>  			       TYPEC_DEVICE);
>  		/*
> @@ -3305,6 +3306,12 @@ static void run_state_machine(struct tcpm_port *port)
>  		 * Similar, dual-mode ports in source mode should transition
>  		 * to PE_SNK_Transition_to_default.
>  		 */
> +		if (port->pd_capable) {
> +			tcpm_set_current_limit(port,
> +					       tcpm_get_current_limit(port),
> +					       5000);
> +			tcpm_set_charge(port, true);
> +		}
>  		tcpm_set_attached_state(port, true);
>  		tcpm_set_state(port, SNK_STARTUP, 0);
>  		break;
> -- 
> 2.19.0.605.g01d371f741-goog

thanks,

Re: [PATCH v3 3/3] usb: typec: tcpm: charge current handling for sink during hard reset

[Badhri Jagan Sridharan]

Hi Heikki, Rob,

Thanks for reviewing !
Should I update the patchset with the Reviewed-by tag and bumpup the
patchset version ?
Or is that not necessary?

Thanks,
Badhri.

On Fri, Nov 2, 2018 at 6:28 AM Heikki Krogerus
<heikki.krogerus@linux.intel.com> wrote:
>
> On Mon, Oct 01, 2018 at 12:45:01PM -0700, Badhri Jagan Sridharan wrote:
> > During the initial connect to a non-pd port, sink would hard reset
> > twice before deeming that the port partner is non-pd. TCPM sets the
> > the charge path to false during the hard reset. This causes unnecessary
> > connects/disconnects of charge path and makes port take longer to
> > charge from the non-pd ports. Avoid this by not setting the charge path
> > to false unless the partner has already identified to be pd capable.
> >
> > When partner is a pd port, set the charge path to false in
> > SNK_HARD_RESET_SINK_OFF. Set the current limits to default value based
> > of CC pull up and resume the charge path when port enters
> > SNK_HARD_RESET_SINK_ON.
> >
> > Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
>
> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
>
> > --------
> > Changes in V3:
> > Rebase on top of usb-next
> >
> > Changes in V2:
> > Based on feedback of jackp@codeaurora.org
> > - vsafe_5v_hard_reset flag from tcpc_config is removed
> > - Patch only differentiates between pd port partner and non-pd port
> > partner
> >
> > V1 version of the patch is here:
> > https://lkml.org/lkml/2018/9/14/11
> > ---
> >  drivers/usb/typec/tcpm/tcpm.c | 9 ++++++++-
> >  1 file changed, 8 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> > index c3ac0e46106b..c25a69922ee6 100644
> > --- a/drivers/usb/typec/tcpm/tcpm.c
> > +++ b/drivers/usb/typec/tcpm/tcpm.c
> > @@ -3273,7 +3273,8 @@ static void run_state_machine(struct tcpm_port *port)
> >       case SNK_HARD_RESET_SINK_OFF:
> >               memset(&port->pps_data, 0, sizeof(port->pps_data));
> >               tcpm_set_vconn(port, false);
> > -             tcpm_set_charge(port, false);
> > +             if (port->pd_capable)
> > +                     tcpm_set_charge(port, false);
> >               tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
> >                              TYPEC_DEVICE);
> >               /*
> > @@ -3305,6 +3306,12 @@ static void run_state_machine(struct tcpm_port *port)
> >                * Similar, dual-mode ports in source mode should transition
> >                * to PE_SNK_Transition_to_default.
> >                */
> > +             if (port->pd_capable) {
> > +                     tcpm_set_current_limit(port,
> > +                                            tcpm_get_current_limit(port),
> > +                                            5000);
> > +                     tcpm_set_charge(port, true);
> > +             }
> >               tcpm_set_attached_state(port, true);
> >               tcpm_set_state(port, SNK_STARTUP, 0);
> >               break;
> > --
> > 2.19.0.605.g01d371f741-goog
>
> thanks,
>
> --
> heikki

[v3,3/3] usb: typec: tcpm: charge current handling for sink during hard reset

[Badhri Jagan Sridharan]

Hi Heikki, Rob,

Thanks for reviewing !
Should I update the patchset with the Reviewed-by tag and bumpup the
patchset version ?
Or is that not necessary?

Thanks,
Badhri.

On Fri, Nov 2, 2018 at 6:28 AM Heikki Krogerus
<heikki.krogerus@linux.intel.com> wrote:
>
> On Mon, Oct 01, 2018 at 12:45:01PM -0700, Badhri Jagan Sridharan wrote:
> > During the initial connect to a non-pd port, sink would hard reset
> > twice before deeming that the port partner is non-pd. TCPM sets the
> > the charge path to false during the hard reset. This causes unnecessary
> > connects/disconnects of charge path and makes port take longer to
> > charge from the non-pd ports. Avoid this by not setting the charge path
> > to false unless the partner has already identified to be pd capable.
> >
> > When partner is a pd port, set the charge path to false in
> > SNK_HARD_RESET_SINK_OFF. Set the current limits to default value based
> > of CC pull up and resume the charge path when port enters
> > SNK_HARD_RESET_SINK_ON.
> >
> > Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
>
> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
>
> > --------
> > Changes in V3:
> > Rebase on top of usb-next
> >
> > Changes in V2:
> > Based on feedback of jackp@codeaurora.org
> > - vsafe_5v_hard_reset flag from tcpc_config is removed
> > - Patch only differentiates between pd port partner and non-pd port
> > partner
> >
> > V1 version of the patch is here:
> > https://lkml.org/lkml/2018/9/14/11
> > ---
> >  drivers/usb/typec/tcpm/tcpm.c | 9 ++++++++-
> >  1 file changed, 8 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> > index c3ac0e46106b..c25a69922ee6 100644
> > --- a/drivers/usb/typec/tcpm/tcpm.c
> > +++ b/drivers/usb/typec/tcpm/tcpm.c
> > @@ -3273,7 +3273,8 @@ static void run_state_machine(struct tcpm_port *port)
> >       case SNK_HARD_RESET_SINK_OFF:
> >               memset(&port->pps_data, 0, sizeof(port->pps_data));
> >               tcpm_set_vconn(port, false);
> > -             tcpm_set_charge(port, false);
> > +             if (port->pd_capable)
> > +                     tcpm_set_charge(port, false);
> >               tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
> >                              TYPEC_DEVICE);
> >               /*
> > @@ -3305,6 +3306,12 @@ static void run_state_machine(struct tcpm_port *port)
> >                * Similar, dual-mode ports in source mode should transition
> >                * to PE_SNK_Transition_to_default.
> >                */
> > +             if (port->pd_capable) {
> > +                     tcpm_set_current_limit(port,
> > +                                            tcpm_get_current_limit(port),
> > +                                            5000);
> > +                     tcpm_set_charge(port, true);
> > +             }
> >               tcpm_set_attached_state(port, true);
> >               tcpm_set_state(port, SNK_STARTUP, 0);
> >               break;
> > --
> > 2.19.0.605.g01d371f741-goog
>
> thanks,
>
> --
> heikki

Re: [PATCH v3 3/3] usb: typec: tcpm: charge current handling for sink during hard reset

[Heikki Krogerus]

On Mon, Nov 05, 2018 at 04:15:24PM -0800, Badhri Jagan Sridharan wrote:
> Hi Heikki, Rob,
> 
> Thanks for reviewing !
> Should I update the patchset with the Reviewed-by tag and bumpup the
> patchset version ?
> Or is that not necessary?

No it's not necessary. Greg will eventually pick these to his queue
(assuming there are no other comments before that), and he'll take
care of adding the tags.


thanks,

-- 
heikki

[v3,3/3] usb: typec: tcpm: charge current handling for sink during hard reset

[Heikki Krogerus]

On Mon, Nov 05, 2018 at 04:15:24PM -0800, Badhri Jagan Sridharan wrote:
> Hi Heikki, Rob,
> 
> Thanks for reviewing !
> Should I update the patchset with the Reviewed-by tag and bumpup the
> patchset version ?
> Or is that not necessary?

No it's not necessary. Greg will eventually pick these to his queue
(assuming there are no other comments before that), and he'll take
care of adding the tags.


thanks,

Re: [PATCH v3 1/3] dt-bindings: connector: Add self-powered property

[Heikki Krogerus]

On Mon, Oct 01, 2018 at 12:44:59PM -0700, Badhri Jagan Sridharan wrote:
> >From USB_PD_R3_0
> 7.1.5 Response to Hard Resets
> Device operation during and after a Hard Reset is defined as follows:
> Self-powered devices Should Not disconnect from USB during a Hard Reset
> (see Section 9.1.2).
> Bus powered devices will disconnect from USB during a Hard Reset due to the
> loss of their power source.
> 
> Therefore it is necessary to know whether the port belongs to
> a device which is self powered or bus powered. This change
> adds "self-powered" flag to the connector class which present indicates
> that the port belongs to a device that is self powered. Else it is
> bus powered usb device.
> 
> Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>

Rob, I can see you acked one of the patches modifying tcpm.c in this
series, but did you mean to put the tag to this patch instead?

FWIW:

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

> -------
> Changes is v3:
> - Rebase on top of usb-next
> - no change w.r.t to this patch. Same as previous versions.
> 
> No v2 version as the patch was introduced there.
> 
> ---
>  Documentation/devicetree/bindings/connector/usb-connector.txt | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/connector/usb-connector.txt b/Documentation/devicetree/bindings/connector/usb-connector.txt
> index d90e17e2428b..a9a2f2fc44f2 100644
> --- a/Documentation/devicetree/bindings/connector/usb-connector.txt
> +++ b/Documentation/devicetree/bindings/connector/usb-connector.txt
> @@ -14,6 +14,8 @@ Optional properties:
>  - label: symbolic name for the connector,
>  - type: size of the connector, should be specified in case of USB-A, USB-B
>    non-fullsize connectors: "mini", "micro".
> +- self-powered: Set this property if the usb device that has its own power
> +  source.
>  
>  Optional properties for usb-c-connector:
>  - power-role: should be one of "source", "sink" or "dual"(DRP) if typec
> -- 
> 2.19.0.605.g01d371f741-goog

thanks,

-- 
heikki

[v3,1/3] dt-bindings: connector: Add self-powered property

[Heikki Krogerus]

On Mon, Oct 01, 2018 at 12:44:59PM -0700, Badhri Jagan Sridharan wrote:
> >From USB_PD_R3_0
> 7.1.5 Response to Hard Resets
> Device operation during and after a Hard Reset is defined as follows:
> Self-powered devices Should Not disconnect from USB during a Hard Reset
> (see Section 9.1.2).
> Bus powered devices will disconnect from USB during a Hard Reset due to the
> loss of their power source.
> 
> Therefore it is necessary to know whether the port belongs to
> a device which is self powered or bus powered. This change
> adds "self-powered" flag to the connector class which present indicates
> that the port belongs to a device that is self powered. Else it is
> bus powered usb device.
> 
> Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>

Rob, I can see you acked one of the patches modifying tcpm.c in this
series, but did you mean to put the tag to this patch instead?

FWIW:

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

> -------
> Changes is v3:
> - Rebase on top of usb-next
> - no change w.r.t to this patch. Same as previous versions.
> 
> No v2 version as the patch was introduced there.
> 
> ---
>  Documentation/devicetree/bindings/connector/usb-connector.txt | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/connector/usb-connector.txt b/Documentation/devicetree/bindings/connector/usb-connector.txt
> index d90e17e2428b..a9a2f2fc44f2 100644
> --- a/Documentation/devicetree/bindings/connector/usb-connector.txt
> +++ b/Documentation/devicetree/bindings/connector/usb-connector.txt
> @@ -14,6 +14,8 @@ Optional properties:
>  - label: symbolic name for the connector,
>  - type: size of the connector, should be specified in case of USB-A, USB-B
>    non-fullsize connectors: "mini", "micro".
> +- self-powered: Set this property if the usb device that has its own power
> +  source.
>  
>  Optional properties for usb-c-connector:
>  - power-role: should be one of "source", "sink" or "dual"(DRP) if typec
> -- 
> 2.19.0.605.g01d371f741-goog

thanks,

Re: [PATCH v3 1/3] dt-bindings: connector: Add self-powered property

[Rob Herring]

On Fri, Nov 2, 2018 at 8:28 AM Heikki Krogerus
<heikki.krogerus@linux.intel.com> wrote:
>
> On Mon, Oct 01, 2018 at 12:44:59PM -0700, Badhri Jagan Sridharan wrote:
> > >From USB_PD_R3_0
> > 7.1.5 Response to Hard Resets
> > Device operation during and after a Hard Reset is defined as follows:
> > Self-powered devices Should Not disconnect from USB during a Hard Reset
> > (see Section 9.1.2).
> > Bus powered devices will disconnect from USB during a Hard Reset due to the
> > loss of their power source.
> >
> > Therefore it is necessary to know whether the port belongs to
> > a device which is self powered or bus powered. This change
> > adds "self-powered" flag to the connector class which present indicates
> > that the port belongs to a device that is self powered. Else it is
> > bus powered usb device.
> >
> > Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
>
> Rob, I can see you acked one of the patches modifying tcpm.c in this
> series, but did you mean to put the tag to this patch instead?

Hum, indeed. Looks like a scripting fail in my reply. The R-by was for this one.

Reviewed-by: Rob Herring <robh@kernel.org>

Rob

[v3,1/3] dt-bindings: connector: Add self-powered property

[Rob Herring]

On Fri, Nov 2, 2018 at 8:28 AM Heikki Krogerus
<heikki.krogerus@linux.intel.com> wrote:
>
> On Mon, Oct 01, 2018 at 12:44:59PM -0700, Badhri Jagan Sridharan wrote:
> > >From USB_PD_R3_0
> > 7.1.5 Response to Hard Resets
> > Device operation during and after a Hard Reset is defined as follows:
> > Self-powered devices Should Not disconnect from USB during a Hard Reset
> > (see Section 9.1.2).
> > Bus powered devices will disconnect from USB during a Hard Reset due to the
> > loss of their power source.
> >
> > Therefore it is necessary to know whether the port belongs to
> > a device which is self powered or bus powered. This change
> > adds "self-powered" flag to the connector class which present indicates
> > that the port belongs to a device that is self powered. Else it is
> > bus powered usb device.
> >
> > Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
>
> Rob, I can see you acked one of the patches modifying tcpm.c in this
> series, but did you mean to put the tag to this patch instead?

Hum, indeed. Looks like a scripting fail in my reply. The R-by was for this one.

Reviewed-by: Rob Herring <robh@kernel.org>

Rob