Re: [PATCH 2/3] [PATCH v2 2/3] usb: typec: tcpm: Do not disconnect link for self powered devices

Sure. Just resent the patch stack !
On Mon, Oct 1, 2018 at 2:54 AM Heikki Krogerus
[off-list ref] wrote:

On Fri, Sep 28, 2018 at 04:47:02PM -0700, Badhri Jagan Sridharan wrote:

quoted

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

quoted

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>

Could you rebase these on top of the latest usb-next. These are not
going to apply cleanly on top of it because tcpm.c and all port
drivers are now in their own directory drivers/usb/typec/tcpm/.

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

quoted

---------
Version history:

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.c | 12 ++++++++++--
 include/linux/usb/tcpm.h |  1 +
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/typec/tcpm.c b/drivers/usb/typec/tcpm.c
index 4f1f4215f3d6e..c3ac0e46106b4 100644
--- a/drivers/usb/typec/tcpm.c
+++ b/drivers/usb/typec/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 7e7fbfb84e8e3..50c74a77db55c 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;
 };

Thanks,

--
heikki