diff options
Diffstat (limited to 'drivers/phy')
| -rw-r--r-- | drivers/phy/motorola/phy-mapphone-mdm6600.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/drivers/phy/motorola/phy-mapphone-mdm6600.c b/drivers/phy/motorola/phy-mapphone-mdm6600.c index 5439dd90d0dd..23705e1a0023 100644 --- a/drivers/phy/motorola/phy-mapphone-mdm6600.c +++ b/drivers/phy/motorola/phy-mapphone-mdm6600.c @@ -19,6 +19,8 @@ #define PHY_MDM6600_PHY_DELAY_MS 4000 /* PHY enable 2.2s to 3.5s */ #define PHY_MDM6600_ENABLED_DELAY_MS 8000 /* 8s more total for MDM6600 */ +#define MDM6600_MODEM_IDLE_DELAY_MS 1000 /* modem after USB suspend */ +#define MDM6600_MODEM_WAKE_DELAY_MS 200 /* modem response after idle */ enum phy_mdm6600_ctrl_lines { PHY_MDM6600_ENABLE, /* USB PHY enable */ @@ -93,9 +95,11 @@ struct phy_mdm6600 { struct gpio_descs *cmd_gpios; struct delayed_work bootup_work; struct delayed_work status_work; + struct delayed_work modem_wake_work; struct completion ack; bool enabled; /* mdm6600 phy enabled */ bool running; /* mdm6600 boot done */ + bool awake; /* mdm6600 respnds on n_gsm */ int status; }; @@ -446,6 +450,62 @@ static void phy_mdm6600_deferred_power_on(struct work_struct *work) dev_err(ddata->dev, "Device not functional\n"); } +/* + * USB suspend puts mdm6600 into low power mode. For any n_gsm using apps, + * we need to keep the modem awake by kicking it's mode0 GPIO. This will + * keep the modem awake for about 1.2 seconds. When no n_gsm apps are using + * the modem, runtime PM auto mode can be enabled so modem can enter low + * power mode. + */ +static void phy_mdm6600_wake_modem(struct phy_mdm6600 *ddata) +{ + struct gpio_desc *mode_gpio0; + + mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0]; + gpiod_set_value_cansleep(mode_gpio0, 1); + usleep_range(5, 15); + gpiod_set_value_cansleep(mode_gpio0, 0); + if (ddata->awake) + usleep_range(5, 15); + else + msleep(MDM6600_MODEM_WAKE_DELAY_MS); +} + +static void phy_mdm6600_modem_wake(struct work_struct *work) +{ + struct phy_mdm6600 *ddata; + + ddata = container_of(work, struct phy_mdm6600, modem_wake_work.work); + phy_mdm6600_wake_modem(ddata); + schedule_delayed_work(&ddata->modem_wake_work, + msecs_to_jiffies(MDM6600_MODEM_IDLE_DELAY_MS)); +} + +static int __maybe_unused phy_mdm6600_runtime_suspend(struct device *dev) +{ + struct phy_mdm6600 *ddata = dev_get_drvdata(dev); + + cancel_delayed_work_sync(&ddata->modem_wake_work); + ddata->awake = false; + + return 0; +} + +static int __maybe_unused phy_mdm6600_runtime_resume(struct device *dev) +{ + struct phy_mdm6600 *ddata = dev_get_drvdata(dev); + + phy_mdm6600_modem_wake(&ddata->modem_wake_work.work); + ddata->awake = true; + + return 0; +} + +static const struct dev_pm_ops phy_mdm6600_pm_ops = { + SET_RUNTIME_PM_OPS(phy_mdm6600_runtime_suspend, + phy_mdm6600_runtime_resume, NULL) +}; + static const struct of_device_id phy_mdm6600_id_table[] = { { .compatible = "motorola,mapphone-mdm6600", }, {}, @@ -464,6 +524,7 @@ static int phy_mdm6600_probe(struct platform_device *pdev) INIT_DELAYED_WORK(&ddata->bootup_work, phy_mdm6600_deferred_power_on); INIT_DELAYED_WORK(&ddata->status_work, phy_mdm6600_status); + INIT_DELAYED_WORK(&ddata->modem_wake_work, phy_mdm6600_modem_wake); init_completion(&ddata->ack); ddata->dev = &pdev->dev; @@ -500,6 +561,24 @@ static int phy_mdm6600_probe(struct platform_device *pdev) */ msleep(PHY_MDM6600_PHY_DELAY_MS + 500); + /* + * Enable PM runtime only after PHY has been powered up properly. + * It is currently only needed after USB suspends mdm6600 and n_gsm + * needs to access the device. We don't want to do this earlier as + * gpio mode0 pin doubles as mdm6600 wake-up gpio. + */ + pm_runtime_use_autosuspend(ddata->dev); + pm_runtime_set_autosuspend_delay(ddata->dev, + MDM6600_MODEM_IDLE_DELAY_MS); + pm_runtime_enable(ddata->dev); + error = pm_runtime_get_sync(ddata->dev); + if (error < 0) { + dev_warn(ddata->dev, "failed to wake modem: %i\n", error); + pm_runtime_put_noidle(ddata->dev); + } + pm_runtime_mark_last_busy(ddata->dev); + pm_runtime_put_autosuspend(ddata->dev); + return 0; cleanup: @@ -512,6 +591,10 @@ static int phy_mdm6600_remove(struct platform_device *pdev) struct phy_mdm6600 *ddata = platform_get_drvdata(pdev); struct gpio_desc *reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET]; + pm_runtime_dont_use_autosuspend(ddata->dev); + pm_runtime_put_sync(ddata->dev); + pm_runtime_disable(ddata->dev); + if (!ddata->running) wait_for_completion_timeout(&ddata->ack, msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS)); @@ -519,6 +602,7 @@ static int phy_mdm6600_remove(struct platform_device *pdev) gpiod_set_value_cansleep(reset_gpio, 1); phy_mdm6600_device_power_off(ddata); + cancel_delayed_work_sync(&ddata->modem_wake_work); cancel_delayed_work_sync(&ddata->bootup_work); cancel_delayed_work_sync(&ddata->status_work); @@ -530,6 +614,7 @@ static struct platform_driver phy_mdm6600_driver = { .remove = phy_mdm6600_remove, .driver = { .name = "phy-mapphone-mdm6600", + .pm = &phy_mdm6600_pm_ops, .of_match_table = of_match_ptr(phy_mdm6600_id_table), }, }; |