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For values that have not been explicitly defined in DT using this attribute, default values will be set. Therefore making this change backward compatible. Cc: Badhri Jagan Sridharan Cc: linux-usb@vger.kernel.org Cc: devicetree@vger.kernel.org Signed-off-by: Amit Sunil Dhamne --- drivers/usb/typec/tcpm/tcpm.c | 110 ++++++++++++++++++++++++++++------ 1 file changed, 92 insertions(+), 18 deletions(-) diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index 4b02d6474259..596d19ff85ac 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -574,6 +574,31 @@ static const char * const pd_rev[] = { [PD_REV30] = "rev3", }; +/* + * Though "pd-timers" is a 1D array, it can be imagined as a table with 2 + * columns, key at even index (that represents timer definition) & value + * at odd index (that represents timer values in ms). + */ +#define NUM_TIMER_TABLE_COLS 2 + +/* + * PD Timer definitions for timers that can be tuned based on platform/board via DT. + * The timer definition value should always match that of macros defined in + * dt-bindings/usb/pd.h. + */ +enum pd_timer { + PD_TIMER_SINK_WAIT_CAP, + PD_TIMER_PS_SOURCE_OFF, + PD_TIMER_CC_DEBOUNCE, + PD_NUM_TIMERS +}; + +static u32 pd_timers[PD_NUM_TIMERS] = { + [PD_TIMER_SINK_WAIT_CAP] = PD_T_SINK_WAIT_CAP, + [PD_TIMER_PS_SOURCE_OFF] = PD_T_PS_SOURCE_OFF, + [PD_TIMER_CC_DEBOUNCE] = PD_T_CC_DEBOUNCE, +}; + #define tcpm_cc_is_sink(cc) \ ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \ (cc) == TYPEC_CC_RP_3_0) @@ -4601,7 +4626,7 @@ static void run_state_machine(struct tcpm_port *port) { int ret; enum typec_pwr_opmode opmode; - unsigned int msecs; + unsigned int msecs, timer_val_msecs; enum tcpm_state upcoming_state; if (port->tcpc->check_contaminant && port->state != CHECK_CONTAMINANT) @@ -4637,17 +4662,18 @@ static void run_state_machine(struct tcpm_port *port) tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK); break; case SRC_ATTACH_WAIT: + timer_val_msecs = pd_timers[PD_TIMER_CC_DEBOUNCE]; if (tcpm_port_is_debug(port)) tcpm_set_state(port, DEBUG_ACC_ATTACHED, - PD_T_CC_DEBOUNCE); + timer_val_msecs); else if (tcpm_port_is_audio(port)) tcpm_set_state(port, AUDIO_ACC_ATTACHED, - PD_T_CC_DEBOUNCE); + timer_val_msecs); else if (tcpm_port_is_source(port) && port->vbus_vsafe0v) tcpm_set_state(port, tcpm_try_snk(port) ? SNK_TRY : SRC_ATTACHED, - PD_T_CC_DEBOUNCE); + timer_val_msecs); break; case SNK_TRY: @@ -4698,7 +4724,7 @@ static void run_state_machine(struct tcpm_port *port) } break; case SRC_TRYWAIT_DEBOUNCE: - tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE); + tcpm_set_state(port, SRC_ATTACHED, pd_timers[PD_TIMER_CC_DEBOUNCE]); break; case SRC_TRYWAIT_UNATTACHED: tcpm_set_state(port, SNK_UNATTACHED, 0); @@ -4896,12 +4922,13 @@ static void run_state_machine(struct tcpm_port *port) tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC); break; case SNK_ATTACH_WAIT: + timer_val_msecs = pd_timers[PD_TIMER_CC_DEBOUNCE]; if ((port->cc1 == TYPEC_CC_OPEN && port->cc2 != TYPEC_CC_OPEN) || (port->cc1 != TYPEC_CC_OPEN && port->cc2 == TYPEC_CC_OPEN)) tcpm_set_state(port, SNK_DEBOUNCED, - PD_T_CC_DEBOUNCE); + timer_val_msecs); else if (tcpm_port_is_disconnected(port)) tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE); @@ -4941,7 +4968,7 @@ static void run_state_machine(struct tcpm_port *port) break; case SNK_TRYWAIT: tcpm_set_cc(port, TYPEC_CC_RD); - tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE); + tcpm_set_state(port, SNK_TRYWAIT_VBUS, pd_timers[PD_TIMER_CC_DEBOUNCE]); break; case SNK_TRYWAIT_VBUS: /* @@ -5014,7 +5041,7 @@ static void run_state_machine(struct tcpm_port *port) break; case SNK_DISCOVERY_DEBOUNCE: tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE, - PD_T_CC_DEBOUNCE); + pd_timers[PD_TIMER_CC_DEBOUNCE]); break; case SNK_DISCOVERY_DEBOUNCE_DONE: if (!tcpm_port_is_disconnected(port) && @@ -5032,6 +5059,7 @@ static void run_state_machine(struct tcpm_port *port) tcpm_set_state(port, SNK_READY, 0); break; } + timer_val_msecs = pd_timers[PD_TIMER_SINK_WAIT_CAP]; /* * If VBUS has never been low, and we time out waiting * for source cap, try a soft reset first, in case we @@ -5041,10 +5069,10 @@ static void run_state_machine(struct tcpm_port *port) if (port->vbus_never_low) { port->vbus_never_low = false; tcpm_set_state(port, SNK_SOFT_RESET, - PD_T_SINK_WAIT_CAP); + timer_val_msecs); } else { tcpm_set_state(port, SNK_WAIT_CAPABILITIES_TIMEOUT, - PD_T_SINK_WAIT_CAP); + timer_val_msecs); } break; case SNK_WAIT_CAPABILITIES_TIMEOUT: @@ -5054,7 +5082,7 @@ static void run_state_machine(struct tcpm_port *port) * sending Source Capability messages after a soft reset. The * specification suggests to do a hard reset when no Source * capability message is received within PD_T_SINK_WAIT_CAP, - * but that might effectively kil the machine's power source. + * but that might effectively kill the machine's power source. * * This slightly diverges from the specification and tries to * recover from this by explicitly asking for the capabilities @@ -5066,7 +5094,8 @@ static void run_state_machine(struct tcpm_port *port) if (tcpm_pd_send_control(port, PD_CTRL_GET_SOURCE_CAP, TCPC_TX_SOP)) tcpm_set_state_cond(port, hard_reset_state(port), 0); else - tcpm_set_state(port, hard_reset_state(port), PD_T_SINK_WAIT_CAP); + tcpm_set_state(port, hard_reset_state(port), + pd_timers[PD_TIMER_SINK_WAIT_CAP]); break; case SNK_NEGOTIATE_CAPABILITIES: port->pd_capable = true; @@ -5203,7 +5232,7 @@ static void run_state_machine(struct tcpm_port *port) tcpm_set_state(port, ACC_UNATTACHED, 0); break; case AUDIO_ACC_DEBOUNCE: - tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE); + tcpm_set_state(port, ACC_UNATTACHED, pd_timers[PD_TIMER_CC_DEBOUNCE]); break; /* Hard_Reset states */ @@ -5420,7 +5449,7 @@ static void run_state_machine(struct tcpm_port *port) tcpm_set_state(port, ERROR_RECOVERY, 0); break; case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF: - tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_OFF); + tcpm_set_state(port, ERROR_RECOVERY, pd_timers[PD_TIMER_PS_SOURCE_OFF]); break; case FR_SWAP_SNK_SRC_NEW_SINK_READY: if (port->vbus_source) @@ -5475,7 +5504,7 @@ static void run_state_machine(struct tcpm_port *port) tcpm_set_cc(port, TYPEC_CC_RD); /* allow CC debounce */ tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED, - PD_T_CC_DEBOUNCE); + pd_timers[PD_TIMER_CC_DEBOUNCE]); break; case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED: /* @@ -5510,7 +5539,7 @@ static void run_state_machine(struct tcpm_port *port) port->pps_data.active, 0); tcpm_set_charge(port, false); tcpm_set_state(port, hard_reset_state(port), - PD_T_PS_SOURCE_OFF); + pd_timers[PD_TIMER_PS_SOURCE_OFF]); break; case PR_SWAP_SNK_SRC_SOURCE_ON: tcpm_enable_auto_vbus_discharge(port, true); @@ -5666,7 +5695,7 @@ static void run_state_machine(struct tcpm_port *port) case PORT_RESET_WAIT_OFF: tcpm_set_state(port, tcpm_default_state(port), - port->vbus_present ? PD_T_PS_SOURCE_OFF : 0); + port->vbus_present ? pd_timers[PD_TIMER_PS_SOURCE_OFF] : 0); break; /* AMS intermediate state */ @@ -6157,7 +6186,7 @@ static void _tcpm_pd_vbus_vsafe0v(struct tcpm_port *port) case SRC_ATTACH_WAIT: if (tcpm_port_is_source(port)) tcpm_set_state(port, tcpm_try_snk(port) ? SNK_TRY : SRC_ATTACHED, - PD_T_CC_DEBOUNCE); + pd_timers[PD_TIMER_CC_DEBOUNCE]); break; case SRC_STARTUP: case SRC_SEND_CAPABILITIES: @@ -7273,6 +7302,47 @@ static int tcpm_fw_get_snk_vdos(struct tcpm_port *port, struct fwnode_handle *fw return 0; } +static int tcpm_fw_get_pd_timers(struct tcpm_port *port, struct fwnode_handle *fwnode) +{ + int ret, i, len; + u32 *buf; + + /* pd-timers is an optional property */ + ret = fwnode_property_count_u32(fwnode, "pd-timers"); + if (ret < 0) { + tcpm_log(port, "Unable to locate 'pd-timers' connector property (%d)", ret); + return 0; + } + + if (ret % NUM_TIMER_TABLE_COLS || ret == 0) { + tcpm_log(port, "Incorrect 'pd-timers' value. Found %d u32 elements in array", ret); + return 0; + } + + len = min(ret, PD_NUM_TIMERS * NUM_TIMER_TABLE_COLS); + + buf = kcalloc(len, sizeof(*buf), GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ret = fwnode_property_read_u32_array(fwnode, "pd-timers", buf, len); + if (ret) { + dev_err(port->dev, "Unable to read pd-timers property (%d)", ret); + goto done; + } + + for (i = 0; i < len - 1; i += NUM_TIMER_TABLE_COLS) { + if (buf[i] >= PD_NUM_TIMERS) + tcpm_log(port, "Unable to find timer index %d, skipping.", buf[i]); + else + pd_timers[buf[i]] = buf[i + 1]; + } + +done: + kfree(buf); + return ret; +} + /* Power Supply access to expose source power information */ enum tcpm_psy_online_states { TCPM_PSY_OFFLINE = 0, @@ -7608,6 +7678,10 @@ struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc) init_completion(&port->pps_complete); tcpm_debugfs_init(port); + err = tcpm_fw_get_pd_timers(port, tcpc->fwnode); + if (err) + goto out_destroy_wq; + err = tcpm_fw_get_caps(port, tcpc->fwnode); if (err < 0) goto out_destroy_wq;