On 06 March 2018 09:50, Hans de Goede wrote:
> Commit 57e6f0d7b804 ("typec: tcpm: Only request matching pdos") is causing
> a regression, before this commit e.g. the GPD win and GPD pocket devices
> were charging at 9V 3A with a PD charger, now they are instead slowly
> discharging at 5V 0.4A, as this commit causes the ports max_snk_mv/ma/mw
> settings to be completely ignored.
>
> Arguably the way to fix this would be to add a PDO_VAR() describing the
> voltage range to the snk_caps of boards which can handle any voltage in
> their range, but the "typec: tcpm: Only request matching pdos" commit
> looks at the type of PDO advertised by the source/charger and if that
> is fixed (as it typically is) only compairs against PDO_FIXED entries
> in the snk_caps so supporting a range of voltage would require adding a
> PDO_FIXED entry for *every possible* voltage to snk_caps.
>
> AFAICT there is no reason why a fixed source_cap cannot be matched against
> a variable snk_cap, so at a minimum the commit should be rewritten to
> support that.
>
> For now lets revert the "typec: tcpm: Only request matching pdos" commit,
> fixing the regression.
>
> Cc: Badhri Jagan Sridharan <bad...@google.com>
> Signed-off-by: Hans de Goede <hdego...@redhat.com>
Thanks Hans. Sadly I alluded to this problem before the patch was pulled in but
this was seemingly missed:
https://lkml.org/lkml/2017/11/28/186
FWIW, Acked-by: Adam Thomson <adam.thomson.opensou...@diasemi.com>
> ---
> drivers/usb/typec/tcpm.c | 163
> ++++++++++++-----------------------------------
> 1 file changed, 42 insertions(+), 121 deletions(-)
>
> diff --git a/drivers/usb/typec/tcpm.c b/drivers/usb/typec/tcpm.c
> index bfcaf6618a1f..735a6dd74c20 100644
> --- a/drivers/usb/typec/tcpm.c
> +++ b/drivers/usb/typec/tcpm.c
> @@ -254,9 +254,6 @@ struct tcpm_port {
> unsigned int nr_src_pdo;
> u32 snk_pdo[PDO_MAX_OBJECTS];
> unsigned int nr_snk_pdo;
> - unsigned int nr_fixed; /* number of fixed sink PDOs */
> - unsigned int nr_var; /* number of variable sink PDOs */
> - unsigned int nr_batt; /* number of battery sink PDOs */
> u32 snk_vdo[VDO_MAX_OBJECTS];
> unsigned int nr_snk_vdo;
>
> @@ -1786,90 +1783,39 @@ static int tcpm_pd_check_request(struct tcpm_port
> *port)
> return 0;
> }
>
> -#define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
> -#define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
> -
> -static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo,
> - int *src_pdo)
> +static int tcpm_pd_select_pdo(struct tcpm_port *port)
> {
> - unsigned int i, j, max_mw = 0, max_mv = 0, mw = 0, mv = 0, ma = 0;
> + unsigned int i, max_mw = 0, max_mv = 0;
> int ret = -EINVAL;
>
> /*
> - * Select the source PDO providing the most power which has a
> - * matchig sink cap.
> + * Select the source PDO providing the most power while staying within
> + * the board's voltage limits. Prefer PDO providing exp
> */
> for (i = 0; i < port->nr_source_caps; i++) {
> u32 pdo = port->source_caps[i];
> enum pd_pdo_type type = pdo_type(pdo);
> + unsigned int mv, ma, mw;
>
> - if (type == PDO_TYPE_FIXED) {
> - for (j = 0; j < port->nr_fixed; j++) {
> - if (pdo_fixed_voltage(pdo) ==
> - pdo_fixed_voltage(port->snk_pdo[j])) {
> - ma = min_current(pdo, port->snk_pdo[j]);
> - mv = pdo_fixed_voltage(pdo);
> - mw = ma * mv / 1000;
> - if (mw > max_mw ||
> - (mw == max_mw && mv > max_mv)) {
> - ret = 0;
> - *src_pdo = i;
> - *sink_pdo = j;
> - max_mw = mw;
> - max_mv = mv;
> - }
> - /* There could only be one fixed pdo
> - * at a specific voltage level.
> - * So breaking here.
> - */
> - break;
> - }
> - }
> - } else if (type == PDO_TYPE_BATT) {
> - for (j = port->nr_fixed;
> - j < port->nr_fixed +
> - port->nr_batt;
> - j++) {
> - if (pdo_min_voltage(pdo) >=
> - pdo_min_voltage(port->snk_pdo[j]) &&
> - pdo_max_voltage(pdo) <=
> - pdo_max_voltage(port->snk_pdo[j])) {
> - mw = min_power(pdo, port->snk_pdo[j]);
> - mv = pdo_min_voltage(pdo);
> - if (mw > max_mw ||
> - (mw == max_mw && mv > max_mv)) {
> - ret = 0;
> - *src_pdo = i;
> - *sink_pdo = j;
> - max_mw = mw;
> - max_mv = mv;
> - }
> - }
> - }
> - } else if (type == PDO_TYPE_VAR) {
> - for (j = port->nr_fixed +
> - port->nr_batt;
> - j < port->nr_fixed +
> - port->nr_batt +
> - port->nr_var;
> - j++) {
> - if (pdo_min_voltage(pdo) >=
> - pdo_min_voltage(port->snk_pdo[j]) &&
> - pdo_max_voltage(pdo) <=
> - pdo_max_voltage(port->snk_pdo[j])) {
> - ma = min_current(pdo, port->snk_pdo[j]);
> - mv = pdo_min_voltage(pdo);
> - mw = ma * mv / 1000;
> - if (mw > max_mw ||
> - (mw == max_mw && mv > max_mv)) {
> - ret = 0;
> - *src_pdo = i;
> - *sink_pdo = j;
> - max_mw = mw;
> - max_mv = mv;
> - }
> - }
> - }
> + if (type == PDO_TYPE_FIXED)
> + mv = pdo_fixed_voltage(pdo);
> + else
> + mv = pdo_min_voltage(pdo);
> +
> + if (type == PDO_TYPE_BATT) {
> + mw = pdo_max_power(pdo);
> + } else {
> + ma = min(pdo_max_current(pdo),
> + port->max_snk_ma);
> + mw = ma * mv / 1000;
> + }
> +
> + /* Perfer higher voltages if available */
> + if ((mw > max_mw || (mw == max_mw && mv > max_mv)) &&
> + mv <= port->max_snk_mv) {
> + ret = i;
> + max_mw = mw;
> + max_mv = mv;
> }
> }
>
> @@ -1881,14 +1827,13 @@ static int tcpm_pd_build_request(struct tcpm_port
> *port, u32 *rdo)
> unsigned int mv, ma, mw, flags;
> unsigned int max_ma, max_mw;
> enum pd_pdo_type type;
> - int src_pdo_index, snk_pdo_index;
> - u32 pdo, matching_snk_pdo;
> + int index;
> + u32 pdo;
>
> - if (tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index) < 0)
> + index = tcpm_pd_select_pdo(port);
> + if (index < 0)
> return -EINVAL;
> -
> - pdo = port->source_caps[src_pdo_index];
> - matching_snk_pdo = port->snk_pdo[snk_pdo_index];
> + pdo = port->source_caps[index];
> type = pdo_type(pdo);
>
> if (type == PDO_TYPE_FIXED)
> @@ -1896,28 +1841,26 @@ static int tcpm_pd_build_request(struct tcpm_port
> *port, u32 *rdo)
> else
> mv = pdo_min_voltage(pdo);
>
> - /* Select maximum available current within the sink pdo's limit */
> + /* Select maximum available current within the board's power limit */
> if (type == PDO_TYPE_BATT) {
> - mw = min_power(pdo, matching_snk_pdo);
> - ma = 1000 * mw / mv;
> + mw = pdo_max_power(pdo);
> + ma = 1000 * min(mw, port->max_snk_mw) / mv;
> } else {
> - ma = min_current(pdo, matching_snk_pdo);
> - mw = ma * mv / 1000;
> + ma = min(pdo_max_current(pdo),
> + 1000 * port->max_snk_mw / mv);
> }
> + ma = min(ma, port->max_snk_ma);
>
> flags = RDO_USB_COMM | RDO_NO_SUSPEND;
>
> /* Set mismatch bit if offered power is less than operating power */
> + mw = ma * mv / 1000;
> max_ma = ma;
> max_mw = mw;
> if (mw < port->operating_snk_mw) {
> flags |= RDO_CAP_MISMATCH;
> - if (type == PDO_TYPE_BATT &&
> - (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
> - max_mw = pdo_max_power(matching_snk_pdo);
> - else if (pdo_max_current(matching_snk_pdo) >
> - pdo_max_current(pdo))
> - max_ma = pdo_max_current(matching_snk_pdo);
> + max_mw = port->operating_snk_mw;
> + max_ma = max_mw * 1000 / mv;
> }
>
> tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
> @@ -1926,16 +1869,16 @@ static int tcpm_pd_build_request(struct tcpm_port
> *port, u32 *rdo)
> port->polarity);
>
> if (type == PDO_TYPE_BATT) {
> - *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
> + *rdo = RDO_BATT(index + 1, mw, max_mw, flags);
>
> tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
> - src_pdo_index, mv, mw,
> + index, mv, mw,
> flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
> } else {
> - *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
> + *rdo = RDO_FIXED(index + 1, ma, max_ma, flags);
>
> tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
> - src_pdo_index, mv, ma,
> + index, mv, ma,
> flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
> }
>
> @@ -3667,19 +3610,6 @@ int tcpm_update_sink_capabilities(struct tcpm_port
> *port, const u32 *pdo,
> }
> EXPORT_SYMBOL_GPL(tcpm_update_sink_capabilities);
>
> -static int nr_type_pdos(const u32 *pdo, unsigned int nr_pdo,
> - enum pd_pdo_type type)
> -{
> - int count = 0;
> - int i;
> -
> - for (i = 0; i < nr_pdo; i++) {
> - if (pdo_type(pdo[i]) == type)
> - count++;
> - }
> - return count;
> -}
> -
> struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev
> *tcpc)
> {
> struct tcpm_port *port;
> @@ -3725,15 +3655,6 @@ struct tcpm_port *tcpm_register_port(struct device
> *dev, struct tcpc_dev *tcpc)
> tcpc->config->nr_src_pdo);
> port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, tcpc->config-
> >snk_pdo,
> tcpc->config->nr_snk_pdo);
> - port->nr_fixed = nr_type_pdos(port->snk_pdo,
> - port->nr_snk_pdo,
> - PDO_TYPE_FIXED);
> - port->nr_var = nr_type_pdos(port->snk_pdo,
> - port->nr_snk_pdo,
> - PDO_TYPE_VAR);
> - port->nr_batt = nr_type_pdos(port->snk_pdo,
> - port->nr_snk_pdo,
> - PDO_TYPE_BATT);
> port->nr_snk_vdo = tcpm_copy_vdos(port->snk_vdo, tcpc->config-
> >snk_vdo,
> tcpc->config->nr_snk_vdo);
>
> --
> 2.14.3
>
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