Re: [PATCH] usb: typec: tcpm: Support non-PD mode
From: Kyle Tso <hidden>
Date: 2021-07-23 17:18:24
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On Fri, Jul 16, 2021 at 5:39 PM Kyle Tso [off-list ref] wrote:
tcpm.c could work well without PD capabilities. Do not block the probe if capabilities are not defined in fwnode and skip the PD power negotiation in the state machine. Signed-off-by: Kyle Tso <redacted> ---
Hi, any comments about this patch? thanks, Kyle
quoted hunk ↗ jump to hunk
drivers/usb/typec/tcpm/tcpm.c | 50 ++++++++++++++++++++--------------- 1 file changed, 29 insertions(+), 21 deletions(-)diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index 5b22a1c931a9..a42de5e17d24 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c@@ -3914,6 +3914,8 @@ static void run_state_machine(struct tcpm_port *port) if (port->ams == POWER_ROLE_SWAP || port->ams == FAST_ROLE_SWAP) tcpm_ams_finish(port); + if (!port->nr_src_pdo) + tcpm_set_state(port, SRC_READY, 0); port->upcoming_state = SRC_SEND_CAPABILITIES; tcpm_ams_start(port, POWER_NEGOTIATION); break;@@ -4161,7 +4163,10 @@ static void run_state_machine(struct tcpm_port *port) current_lim = PD_P_SNK_STDBY_MW / 5; tcpm_set_current_limit(port, current_lim, 5000); tcpm_set_charge(port, true); - tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0); + if (!port->nr_snk_pdo) + tcpm_set_state(port, SNK_READY, 0); + else + tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0); break; } /*@@ -5939,15 +5944,17 @@ static int tcpm_fw_get_caps(struct tcpm_port *port, /* Get source pdos */ ret = fwnode_property_count_u32(fwnode, "source-pdos"); - if (ret <= 0) - return -EINVAL; + if (ret < 0) + ret = 0; port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS); - ret = fwnode_property_read_u32_array(fwnode, "source-pdos", - port->src_pdo, port->nr_src_pdo); - if ((ret < 0) || tcpm_validate_caps(port, port->src_pdo, - port->nr_src_pdo)) - return -EINVAL; + if (port->nr_src_pdo) { + ret = fwnode_property_read_u32_array(fwnode, "source-pdos", + port->src_pdo, port->nr_src_pdo); + if ((ret < 0) || tcpm_validate_caps(port, port->src_pdo, + port->nr_src_pdo)) + return -EINVAL; + } if (port->port_type == TYPEC_PORT_SRC) return 0;@@ -5963,19 +5970,21 @@ static int tcpm_fw_get_caps(struct tcpm_port *port, sink: /* Get sink pdos */ ret = fwnode_property_count_u32(fwnode, "sink-pdos"); - if (ret <= 0) - return -EINVAL; + if (ret < 0) + ret = 0; port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS); - ret = fwnode_property_read_u32_array(fwnode, "sink-pdos", - port->snk_pdo, port->nr_snk_pdo); - if ((ret < 0) || tcpm_validate_caps(port, port->snk_pdo, - port->nr_snk_pdo)) - return -EINVAL; + if (port->nr_snk_pdo) { + ret = fwnode_property_read_u32_array(fwnode, "sink-pdos", + port->snk_pdo, port->nr_snk_pdo); + if ((ret < 0) || tcpm_validate_caps(port, port->snk_pdo, + port->nr_snk_pdo)) + return -EINVAL; - if (fwnode_property_read_u32(fwnode, "op-sink-microwatt", &mw) < 0) - return -EINVAL; - port->operating_snk_mw = mw / 1000; + if (fwnode_property_read_u32(fwnode, "op-sink-microwatt", &mw) < 0) + return -EINVAL; + port->operating_snk_mw = mw / 1000; + } port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");@@ -6283,9 +6292,8 @@ struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc) int err; if (!dev || !tcpc || - !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc || - !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus || - !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit) + !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc || !tcpc->set_polarity || + !tcpc->set_vconn || !tcpc->set_vbus || !tcpc->set_roles) return ERR_PTR(-EINVAL); port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); --2.32.0.402.g57bb445576-goog