The TPS6598x PD controller provides an active-high hardware reset input that reinitializes all device settings. If it is not grounded by design, the driver must be able to de-assert it in order to initialize the device. The PD controller is not ready for registration right after the reset de-assertion and a delay must be introduced in that case. According to TI, the delay can reach up to 1000 ms [1], which is in line with the experimental results obtained with a TPS65987D. Add a GPIO descriptor for the reset signal and basic reset management for initialization and suspend/resume. [1] https://e2e.ti.com/support/power-management-group/power-management/ f/power-management-forum/1269856/tps65987d-tps65987d-reset-de-assert- to-normal-operation/4809389#4809389 Signed-off-by: Javier Carrasco <javier.carrasco@xxxxxxxxxxxxxx> --- drivers/usb/typec/tipd/core.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c index 37b56ce75f39..550f5913e985 100644 --- a/drivers/usb/typec/tipd/core.c +++ b/drivers/usb/typec/tipd/core.c @@ -8,6 +8,7 @@ #include <linux/i2c.h> #include <linux/acpi.h> +#include <linux/gpio/consumer.h> #include <linux/module.h> #include <linux/of.h> #include <linux/power_supply.h> @@ -43,6 +44,9 @@ /* TPS_REG_SYSTEM_CONF bits */ #define TPS_SYSCONF_PORTINFO(c) ((c) & 7) +/* reset de-assertion to ready for operation */ +#define SETUP_MS 1000 + enum { TPS_PORTINFO_SINK, TPS_PORTINFO_SINK_ACCESSORY, @@ -86,6 +90,7 @@ struct tps6598x { struct mutex lock; /* device lock */ u8 i2c_protocol:1; + struct gpio_desc *reset; struct typec_port *port; struct typec_partner *partner; struct usb_pd_identity partner_identity; @@ -717,6 +722,13 @@ static int tps6598x_probe(struct i2c_client *client) mutex_init(&tps->lock); tps->dev = &client->dev; + tps->reset = devm_gpiod_get_optional(tps->dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(tps->reset)) + return dev_err_probe(tps->dev, PTR_ERR(tps->reset), + "failed to get reset GPIO\n"); + if (tps->reset) + msleep(SETUP_MS); + tps->regmap = devm_regmap_init_i2c(client, &tps6598x_regmap_config); if (IS_ERR(tps->regmap)) return PTR_ERR(tps->regmap); @@ -892,6 +904,9 @@ static void tps6598x_remove(struct i2c_client *client) tps6598x_disconnect(tps, 0); typec_unregister_port(tps->port); usb_role_switch_put(tps->role_sw); + + if (tps->reset) + gpiod_set_value_cansleep(tps->reset, 1); } static int __maybe_unused tps6598x_suspend(struct device *dev) @@ -902,7 +917,8 @@ static int __maybe_unused tps6598x_suspend(struct device *dev) if (tps->wakeup) { disable_irq(client->irq); enable_irq_wake(client->irq); - } + } else if (tps->reset) + gpiod_set_value_cansleep(tps->reset, 1); if (!client->irq) cancel_delayed_work_sync(&tps->wq_poll); @@ -918,6 +934,9 @@ static int __maybe_unused tps6598x_resume(struct device *dev) if (tps->wakeup) { disable_irq_wake(client->irq); enable_irq(client->irq); + } else if (tps->reset) { + gpiod_set_value_cansleep(tps->reset, 0); + msleep(SETUP_MS); } if (!client->irq) -- 2.39.2
