From: Badhri Jagan Sridharan badhri@google.com
commit e3a0720224873587954b55d193d5b4abb14f0443 upstream.
tcpm_pd_select_pps_apdo overwrites port->pps_data.min_volt, port->pps_data.max_volt, port->pps_data.max_curr even before port partner accepts the requests. This leaves incorrect values in current_limit and supply_voltage that get exported by "tcpm-source-psy-". Solving this problem by caching the request values in req_min_volt, req_max_volt, req_max_curr, req_out_volt, req_op_curr. min_volt, max_volt, max_curr gets updated once the partner accepts the request. current_limit, supply_voltage gets updated once local port's tcpm enters SNK_TRANSITION_SINK when the accepted current_limit and supply_voltage is enforced.
Fixes: f2a8aa053c176 ("typec: tcpm: Represent source supply through power_supply") Signed-off-by: Badhri Jagan Sridharan badhri@google.com Cc: stable stable@vger.kernel.org Reviewed-by: Adam Thomson Adam.Thomson.Opensource@diasemi.com Reviewed-by: Heikki Krogerus heikki.krogerus@linux.intel.com Link: https://lore.kernel.org/r/20210407200723.1914388-2-badhri@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/typec/tcpm/tcpm.c | 88 +++++++++++++++++++++++++----------------- 1 file changed, 53 insertions(+), 35 deletions(-)
--- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -181,12 +181,27 @@ struct pd_mode_data { struct typec_altmode_desc altmode_desc[ALTMODE_DISCOVERY_MAX]; };
+/* + * @min_volt: Actual min voltage at the local port + * @req_min_volt: Requested min voltage to the port partner + * @max_volt: Actual max voltage at the local port + * @req_max_volt: Requested max voltage to the port partner + * @max_curr: Actual max current at the local port + * @req_max_curr: Requested max current of the port partner + * @req_out_volt: Requested output voltage to the port partner + * @req_op_curr: Requested operating current to the port partner + * @supported: Parter has atleast one APDO hence supports PPS + * @active: PPS mode is active + */ struct pd_pps_data { u32 min_volt; + u32 req_min_volt; u32 max_volt; + u32 req_max_volt; u32 max_curr; - u32 out_volt; - u32 op_curr; + u32 req_max_curr; + u32 req_out_volt; + u32 req_op_curr; bool supported; bool active; }; @@ -1767,8 +1782,8 @@ static void tcpm_pd_ctrl_request(struct break; case SNK_NEGOTIATE_PPS_CAPABILITIES: /* Revert data back from any requested PPS updates */ - port->pps_data.out_volt = port->supply_voltage; - port->pps_data.op_curr = port->current_limit; + port->pps_data.req_out_volt = port->supply_voltage; + port->pps_data.req_op_curr = port->current_limit; port->pps_status = (type == PD_CTRL_WAIT ? -EAGAIN : -EOPNOTSUPP); tcpm_set_state(port, SNK_READY, 0); @@ -1800,8 +1815,11 @@ static void tcpm_pd_ctrl_request(struct break; case SNK_NEGOTIATE_PPS_CAPABILITIES: port->pps_data.active = true; - port->req_supply_voltage = port->pps_data.out_volt; - port->req_current_limit = port->pps_data.op_curr; + port->pps_data.min_volt = port->pps_data.req_min_volt; + port->pps_data.max_volt = port->pps_data.req_max_volt; + port->pps_data.max_curr = port->pps_data.req_max_curr; + port->req_supply_voltage = port->pps_data.req_out_volt; + port->req_current_limit = port->pps_data.req_op_curr; tcpm_set_state(port, SNK_TRANSITION_SINK, 0); break; case SOFT_RESET_SEND: @@ -2315,16 +2333,16 @@ static unsigned int tcpm_pd_select_pps_a src = port->source_caps[src_pdo]; snk = port->snk_pdo[snk_pdo];
- port->pps_data.min_volt = max(pdo_pps_apdo_min_voltage(src), - pdo_pps_apdo_min_voltage(snk)); - port->pps_data.max_volt = min(pdo_pps_apdo_max_voltage(src), - pdo_pps_apdo_max_voltage(snk)); - port->pps_data.max_curr = min_pps_apdo_current(src, snk); - port->pps_data.out_volt = min(port->pps_data.max_volt, - max(port->pps_data.min_volt, - port->pps_data.out_volt)); - port->pps_data.op_curr = min(port->pps_data.max_curr, - port->pps_data.op_curr); + port->pps_data.req_min_volt = max(pdo_pps_apdo_min_voltage(src), + pdo_pps_apdo_min_voltage(snk)); + port->pps_data.req_max_volt = min(pdo_pps_apdo_max_voltage(src), + pdo_pps_apdo_max_voltage(snk)); + port->pps_data.req_max_curr = min_pps_apdo_current(src, snk); + port->pps_data.req_out_volt = min(port->pps_data.max_volt, + max(port->pps_data.min_volt, + port->pps_data.req_out_volt)); + port->pps_data.req_op_curr = min(port->pps_data.max_curr, + port->pps_data.req_op_curr); power_supply_changed(port->psy); }
@@ -2452,10 +2470,10 @@ static int tcpm_pd_build_pps_request(str tcpm_log(port, "Invalid APDO selected!"); return -EINVAL; } - max_mv = port->pps_data.max_volt; - max_ma = port->pps_data.max_curr; - out_mv = port->pps_data.out_volt; - op_ma = port->pps_data.op_curr; + max_mv = port->pps_data.req_max_volt; + max_ma = port->pps_data.req_max_curr; + out_mv = port->pps_data.req_out_volt; + op_ma = port->pps_data.req_op_curr; break; default: tcpm_log(port, "Invalid PDO selected!"); @@ -2502,8 +2520,8 @@ static int tcpm_pd_build_pps_request(str tcpm_log(port, "Requesting APDO %d: %u mV, %u mA", src_pdo_index, out_mv, op_ma);
- port->pps_data.op_curr = op_ma; - port->pps_data.out_volt = out_mv; + port->pps_data.req_op_curr = op_ma; + port->pps_data.req_out_volt = out_mv;
return 0; } @@ -4174,7 +4192,7 @@ static int tcpm_try_role(const struct ty return ret; }
-static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr) +static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 req_op_curr) { unsigned int target_mw; int ret; @@ -4192,22 +4210,22 @@ static int tcpm_pps_set_op_curr(struct t goto port_unlock; }
- if (op_curr > port->pps_data.max_curr) { + if (req_op_curr > port->pps_data.max_curr) { ret = -EINVAL; goto port_unlock; }
- target_mw = (op_curr * port->pps_data.out_volt) / 1000; + target_mw = (req_op_curr * port->supply_voltage) / 1000; if (target_mw < port->operating_snk_mw) { ret = -EINVAL; goto port_unlock; }
/* Round down operating current to align with PPS valid steps */ - op_curr = op_curr - (op_curr % RDO_PROG_CURR_MA_STEP); + req_op_curr = req_op_curr - (req_op_curr % RDO_PROG_CURR_MA_STEP);
reinit_completion(&port->pps_complete); - port->pps_data.op_curr = op_curr; + port->pps_data.req_op_curr = req_op_curr; port->pps_status = 0; port->pps_pending = true; tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0); @@ -4229,7 +4247,7 @@ swap_unlock: return ret; }
-static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt) +static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 req_out_volt) { unsigned int target_mw; int ret; @@ -4247,23 +4265,23 @@ static int tcpm_pps_set_out_volt(struct goto port_unlock; }
- if (out_volt < port->pps_data.min_volt || - out_volt > port->pps_data.max_volt) { + if (req_out_volt < port->pps_data.min_volt || + req_out_volt > port->pps_data.max_volt) { ret = -EINVAL; goto port_unlock; }
- target_mw = (port->pps_data.op_curr * out_volt) / 1000; + target_mw = (port->current_limit * req_out_volt) / 1000; if (target_mw < port->operating_snk_mw) { ret = -EINVAL; goto port_unlock; }
/* Round down output voltage to align with PPS valid steps */ - out_volt = out_volt - (out_volt % RDO_PROG_VOLT_MV_STEP); + req_out_volt = req_out_volt - (req_out_volt % RDO_PROG_VOLT_MV_STEP);
reinit_completion(&port->pps_complete); - port->pps_data.out_volt = out_volt; + port->pps_data.req_out_volt = req_out_volt; port->pps_status = 0; port->pps_pending = true; tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0); @@ -4312,8 +4330,8 @@ static int tcpm_pps_activate(struct tcpm
/* Trigger PPS request or move back to standard PDO contract */ if (activate) { - port->pps_data.out_volt = port->supply_voltage; - port->pps_data.op_curr = port->current_limit; + port->pps_data.req_out_volt = port->supply_voltage; + port->pps_data.req_op_curr = port->current_limit; tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0); } else { tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);