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Message-ID: <18399115-5897-2c53-f8e5-6cdbd63a9658@roeck-us.net>
Date: Fri, 9 Apr 2021 19:10:04 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Badhri Jagan Sridharan <badhri@...gle.com>,
Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Rob Herring <robh+dt@...nel.org>,
Adam Thomson <Adam.Thomson.Opensource@...semi.com>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, Kyle Tso <kyletso@...gle.com>
Subject: Re: [PATCH v2 2/6] usb: typec: tcpm: Address incorrect values of tcpm
psy for pps supply
On 4/7/21 1:07 PM, Badhri Jagan Sridharan wrote:
> 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@...gle.com>
> Reviewed-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
> ---
> Changes since V1:
> * Moved to kerneldoc header as suggested by Greg KH.
> * Added reviewed by tags.
> ---
> drivers/usb/typec/tcpm/tcpm.c | 88 +++++++++++++++++++++--------------
> 1 file changed, 53 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 4ea4b30ae885..b4a40099d7e9 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -268,12 +268,27 @@ 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;
> };
> @@ -2498,8 +2513,8 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
> 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);
>
> @@ -2548,8 +2563,11 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
> 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:
> @@ -3108,16 +3126,16 @@ static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
> 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);
> }
>
> @@ -3245,10 +3263,10 @@ static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
> 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!");
> @@ -3295,8 +3313,8 @@ static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
> 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;
> }
> @@ -5429,7 +5447,7 @@ static int tcpm_try_role(struct typec_port *p, int role)
> 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;
> @@ -5447,12 +5465,12 @@ static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr)
> 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;
> @@ -5466,10 +5484,10 @@ static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr)
> }
>
> /* 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;
> mutex_unlock(&port->lock);
> @@ -5490,7 +5508,7 @@ static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr)
> 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;
> @@ -5508,13 +5526,13 @@ static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt)
> 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;
> @@ -5528,10 +5546,10 @@ static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt)
> }
>
> /* 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;
> mutex_unlock(&port->lock);
> @@ -5589,8 +5607,8 @@ static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
>
> /* 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;
> }
> mutex_unlock(&port->lock);
>
>
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