On Wed, Dec 11, 2024 at 05:32:47PM +0100, Oliver Facklam wrote:
> The TI HD3SS3220 Type-C controller supports configuring
> its role preference when operating as a dual-role port
> through the SOURCE_PREF field of the General Control Register.
>
> The previous driver behavior was to set the role preference
> based on the dr_set typec_operation.
> However, the controller does not support swapping the data role
> on an active connection due to its lack of Power Delivery support.
>
> Remove previous dr_set typec_operation, and support setting
> the role preference based on the corresponding fwnode property,
> as well as the try_role typec_operation.
>
> Signed-off-by: Oliver Facklam <oliver.facklam@xxxxxxxxxxx>
Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> ---
> drivers/usb/typec/hd3ss3220.c | 72 ++++++++++++++++++++++++++++---------------
> 1 file changed, 47 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/usb/typec/hd3ss3220.c b/drivers/usb/typec/hd3ss3220.c
> index e2059b925ab15733ff097e940751759ed51e0ab3..3ecc688dda82a371929e204a490a68c8e9d81fe9 100644
> --- a/drivers/usb/typec/hd3ss3220.c
> +++ b/drivers/usb/typec/hd3ss3220.c
> @@ -127,8 +127,25 @@ static int hd3ss3220_set_port_type(struct hd3ss3220 *hd3ss3220, int type)
> return err;
> }
>
> -static int hd3ss3220_set_source_pref(struct hd3ss3220 *hd3ss3220, int src_pref)
> +static int hd3ss3220_set_source_pref(struct hd3ss3220 *hd3ss3220, int prefer_role)
> {
> + int src_pref;
> +
> + switch (prefer_role) {
> + case TYPEC_NO_PREFERRED_ROLE:
> + src_pref = HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_DEFAULT;
> + break;
> + case TYPEC_SINK:
> + src_pref = HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_TRY_SNK;
> + break;
> + case TYPEC_SOURCE:
> + src_pref = HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_TRY_SRC;
> + break;
> + default:
> + dev_err(hd3ss3220->dev, "bad role preference: %d\n", prefer_role);
> + return -EINVAL;
> + }
> +
> return regmap_update_bits(hd3ss3220->regmap, HD3SS3220_REG_GEN_CTRL,
> HD3SS3220_REG_GEN_CTRL_SRC_PREF_MASK,
> src_pref);
> @@ -160,27 +177,11 @@ static enum usb_role hd3ss3220_get_attached_state(struct hd3ss3220 *hd3ss3220)
> return attached_state;
> }
>
> -static int hd3ss3220_dr_set(struct typec_port *port, enum typec_data_role role)
> +static int hd3ss3220_try_role(struct typec_port *port, int role)
> {
> struct hd3ss3220 *hd3ss3220 = typec_get_drvdata(port);
> - enum usb_role role_val;
> - int pref, ret = 0;
>
> - if (role == TYPEC_HOST) {
> - role_val = USB_ROLE_HOST;
> - pref = HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_TRY_SRC;
> - } else {
> - role_val = USB_ROLE_DEVICE;
> - pref = HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_TRY_SNK;
> - }
> -
> - ret = hd3ss3220_set_source_pref(hd3ss3220, pref);
> - usleep_range(10, 100);
> -
> - usb_role_switch_set_role(hd3ss3220->role_sw, role_val);
> - typec_set_data_role(hd3ss3220->port, role);
> -
> - return ret;
> + return hd3ss3220_set_source_pref(hd3ss3220, role);
> }
>
> static int hd3ss3220_port_type_set(struct typec_port *port, enum typec_port_type type)
> @@ -191,7 +192,7 @@ static int hd3ss3220_port_type_set(struct typec_port *port, enum typec_port_type
> }
>
> static const struct typec_operations hd3ss3220_ops = {
> - .dr_set = hd3ss3220_dr_set,
> + .try_role = hd3ss3220_try_role,
> .port_type_set = hd3ss3220_port_type_set,
> };
>
> @@ -200,9 +201,6 @@ static void hd3ss3220_set_role(struct hd3ss3220 *hd3ss3220)
> enum usb_role role_state = hd3ss3220_get_attached_state(hd3ss3220);
>
> usb_role_switch_set_role(hd3ss3220->role_sw, role_state);
> - if (role_state == USB_ROLE_NONE)
> - hd3ss3220_set_source_pref(hd3ss3220,
> - HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_DEFAULT);
>
> switch (role_state) {
> case USB_ROLE_HOST:
> @@ -293,6 +291,28 @@ static int hd3ss3220_configure_port_type(struct hd3ss3220 *hd3ss3220,
> return hd3ss3220_set_port_type(hd3ss3220, cap->type);
> }
>
> +static int hd3ss3220_configure_source_pref(struct hd3ss3220 *hd3ss3220,
> + struct fwnode_handle *connector,
> + struct typec_capability *cap)
> +{
> + /*
> + * Preferred role can be configured through device tree
> + */
> + const char *cap_str;
> + int ret;
> +
> + ret = fwnode_property_read_string(connector, "try-power-role", &cap_str);
> + if (ret)
> + return 0;
> +
> + ret = typec_find_power_role(cap_str);
> + if (ret < 0)
> + return ret;
> +
> + cap->prefer_role = ret;
> + return hd3ss3220_set_source_pref(hd3ss3220, cap->prefer_role);
> +}
> +
> static const struct regmap_config config = {
> .reg_bits = 8,
> .val_bits = 8,
> @@ -319,8 +339,6 @@ static int hd3ss3220_probe(struct i2c_client *client)
> if (IS_ERR(hd3ss3220->regmap))
> return PTR_ERR(hd3ss3220->regmap);
>
> - hd3ss3220_set_source_pref(hd3ss3220,
> - HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_DEFAULT);
> /* For backward compatibility check the connector child node first */
> connector = device_get_named_child_node(hd3ss3220->dev, "connector");
> if (connector) {
> @@ -348,6 +366,10 @@ static int hd3ss3220_probe(struct i2c_client *client)
> typec_cap.ops = &hd3ss3220_ops;
> typec_cap.fwnode = connector;
>
> + ret = hd3ss3220_configure_source_pref(hd3ss3220, connector, &typec_cap);
> + if (ret < 0)
> + goto err_put_role;
> +
> ret = hd3ss3220_configure_port_type(hd3ss3220, connector, &typec_cap);
> if (ret < 0)
> goto err_put_role;
>
> --
> 2.34.1
--
heikki
