[PATCH 5.11 017/601] usb: typec: tcpm: Address incorrect values of tcpm psy for pps supply

Greg Kroah-Hartman
2021-05-12T16:52:35Z

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
@@ -218,12 +218,27 @@ 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;
};
@@ -1954,8 +1969,8 @@ 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);
@@ -1994,8 +2009,11 @@ 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:
@@ -2522,16 +2540,16 @@ 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);
}

@@ -2659,10 +2677,10 @@ 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!");
@@ -2709,8 +2727,8 @@ 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;
}
@@ -4634,7 +4652,7 @@ static int tcpm_try_role(struct typec_po
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;
@@ -4652,22 +4670,22 @@ 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);
@@ -4689,7 +4707,7 @@ 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;
@@ -4707,23 +4725,23 @@ 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);
@@ -4772,8 +4790,8 @@ 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);