usb: typec: tipd: Only update power status on IRQ

Instead of refetching power status cache it and only update it when a
change is signalled via irq. This simplifies tracing and adding more
supply properties in follow up patches.

Signed-off-by: Guido Günther <agx@sigxcpu.org>
Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20220317154518.4082046-2-sebastian.krzyszkowiak@puri.sm
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index 16b4560..dfbba5a 100644 (file)
--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -93,6 +93,8 @@ struct tps6598x {
        struct power_supply *psy;
        struct power_supply_desc psy_desc;
        enum power_supply_usb_type usb_type;
+
+       u16 pwr_status;
 };
 
 static enum power_supply_property tps6598x_psy_props[] = {
@@ -230,17 +232,12 @@ static int tps6598x_connect(struct tps6598x *tps, u32 status)
 {
        struct typec_partner_desc desc;
        enum typec_pwr_opmode mode;
-       u16 pwr_status;
        int ret;
 
        if (tps->partner)
                return 0;
 
-       ret = tps6598x_read16(tps, TPS_REG_POWER_STATUS, &pwr_status);
-       if (ret < 0)
-               return ret;
-
-       mode = TPS_POWER_STATUS_PWROPMODE(pwr_status);
+       mode = TPS_POWER_STATUS_PWROPMODE(tps->pwr_status);
 
        desc.usb_pd = mode == TYPEC_PWR_MODE_PD;
        desc.accessory = TYPEC_ACCESSORY_NONE; /* XXX: handle accessories */
@@ -455,6 +452,7 @@ static bool tps6598x_read_power_status(struct tps6598x *tps)
                dev_err(tps->dev, "failed to read power status: %d\n", ret);
                return false;
        }
+       tps->pwr_status = pwr_status;
        trace_tps6598x_power_status(pwr_status);
 
        return true;
@@ -601,15 +599,8 @@ static const struct regmap_config tps6598x_regmap_config = {
 static int tps6598x_psy_get_online(struct tps6598x *tps,
                                   union power_supply_propval *val)
 {
-       int ret;
-       u16 pwr_status;
-
-       ret = tps6598x_read16(tps, TPS_REG_POWER_STATUS, &pwr_status);
-       if (ret < 0)
-               return ret;
-
-       if (TPS_POWER_STATUS_CONNECTION(pwr_status) &&
-           TPS_POWER_STATUS_SOURCESINK(pwr_status)) {
+       if (TPS_POWER_STATUS_CONNECTION(tps->pwr_status) &&
+           TPS_POWER_STATUS_SOURCESINK(tps->pwr_status)) {
                val->intval = 1;
        } else {
                val->intval = 0;
@@ -622,15 +613,11 @@ static int tps6598x_psy_get_prop(struct power_supply *psy,
                                 union power_supply_propval *val)
 {
        struct tps6598x *tps = power_supply_get_drvdata(psy);
-       u16 pwr_status;
        int ret = 0;
 
        switch (psp) {
        case POWER_SUPPLY_PROP_USB_TYPE:
-               ret = tps6598x_read16(tps, TPS_REG_POWER_STATUS, &pwr_status);
-               if (ret < 0)
-                       return ret;
-               if (TPS_POWER_STATUS_PWROPMODE(pwr_status) == TYPEC_PWR_MODE_PD)
+               if (TPS_POWER_STATUS_PWROPMODE(tps->pwr_status) == TYPEC_PWR_MODE_PD)
                        val->intval = POWER_SUPPLY_USB_TYPE_PD;
                else
                        val->intval = POWER_SUPPLY_USB_TYPE_C;
@@ -837,6 +824,11 @@ static int tps6598x_probe(struct i2c_client *client)
        fwnode_handle_put(fwnode);
 
        if (status & TPS_STATUS_PLUG_PRESENT) {
+               ret = tps6598x_read16(tps, TPS_REG_POWER_STATUS, &tps->pwr_status);
+               if (ret < 0) {
+                       dev_err(tps->dev, "failed to read power status: %d\n", ret);
+                       goto err_role_put;
+               }
                ret = tps6598x_connect(tps, status);
                if (ret)
                        dev_err(&client->dev, "failed to register partner\n");