[PATCH v3 3/4] phy-sun4i-usb: Add workaround for missing Vbus det interrupts on A31

[kishon@ti.com (Kishon Vijay Abraham I)]

On Sunday 05 June 2016 08:29 PM, Hans de Goede wrote:
> The A31 companion pmic (axp221) does not generate vbus change interrupts
> when the board is driving vbus, so we must poll when using the pmic for
> vbus-det _and_ we're driving vbus.
> 
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
> ---
> Changes in v2:
> -No changes
> Changes in v3:
> -No changes
> ---
>  drivers/phy/phy-sun4i-usb.c | 34 ++++++++++++++++++++++++----------
>  1 file changed, 24 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
> index e3cbaae..a7abae6 100644
> --- a/drivers/phy/phy-sun4i-usb.c
> +++ b/drivers/phy/phy-sun4i-usb.c
> @@ -95,6 +95,7 @@
>  
>  enum sun4i_usb_phy_type {
>  	sun4i_a10_phy,
> +	sun6i_a31_phy,
>  	sun8i_a33_phy,
>  	sun8i_h3_phy,
>  };
> @@ -125,7 +126,6 @@ struct sun4i_usb_phy_data {
>  	/* phy0 / otg related variables */
>  	struct extcon_dev *extcon;
>  	bool phy0_init;
> -	bool phy0_poll;
>  	struct gpio_desc *id_det_gpio;
>  	struct gpio_desc *vbus_det_gpio;
>  	struct power_supply *vbus_power_supply;
> @@ -353,6 +353,24 @@ static bool sun4i_usb_phy0_have_vbus_det(struct sun4i_usb_phy_data *data)
>  	return data->vbus_det_gpio || data->vbus_power_supply;
>  }
>  
> +static bool sun4i_usb_phy0_poll(struct sun4i_usb_phy_data *data)
> +{
> +	if ((data->id_det_gpio && data->id_det_irq < 0) ||
> +	    (data->vbus_det_gpio && data->vbus_det_irq < 0))
> +		return true;
> +
> +	/*
> +	 * The A31 companion pmic (axp221) does not generate vbus change
> +	 * interrupts when the board is driving vbus, so we must poll
> +	 * when using the pmic for vbus-det _and_ we're driving vbus.
> +	 */
> +	if (data->cfg->type == sun6i_a31_phy &&
> +	    data->vbus_power_supply && data->phys[0].regulator_on)
> +		return true;
> +
> +	return false;
> +}
> +
>  static int sun4i_usb_phy_power_on(struct phy *_phy)
>  {
>  	struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
> @@ -374,7 +392,7 @@ static int sun4i_usb_phy_power_on(struct phy *_phy)
>  	phy->regulator_on = true;
>  
>  	/* We must report Vbus high within OTG_TIME_A_WAIT_VRISE msec. */
> -	if (phy->index == 0 && data->vbus_det_gpio && data->phy0_poll)
> +	if (phy->index == 0 && sun4i_usb_phy0_poll(data))
>  		mod_delayed_work(system_wq, &data->detect, DEBOUNCE_TIME);
>  
>  	return 0;
> @@ -395,7 +413,7 @@ static int sun4i_usb_phy_power_off(struct phy *_phy)
>  	 * phy0 vbus typically slowly discharges, sometimes this causes the
>  	 * Vbus gpio to not trigger an edge irq on Vbus off, so force a rescan.
>  	 */
> -	if (phy->index == 0 && data->vbus_det_gpio && !data->phy0_poll)
> +	if (phy->index == 0 && !sun4i_usb_phy0_poll(data))
>  		mod_delayed_work(system_wq, &data->detect, POLL_TIME);
>  
>  	return 0;
> @@ -483,7 +501,7 @@ static void sun4i_usb_phy0_id_vbus_det_scan(struct work_struct *work)
>  	if (vbus_notify)
>  		extcon_set_cable_state_(data->extcon, EXTCON_USB, vbus_det);
>  
> -	if (data->phy0_poll)
> +	if (sun4i_usb_phy0_poll(data))
>  		queue_delayed_work(system_wq, &data->detect, POLL_TIME);
>  }
>  
> @@ -668,11 +686,6 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
>  	}
>  
>  	data->id_det_irq = gpiod_to_irq(data->id_det_gpio);
> -	data->vbus_det_irq = gpiod_to_irq(data->vbus_det_gpio);
> -	if ((data->id_det_gpio && data->id_det_irq < 0) ||
> -	    (data->vbus_det_gpio && data->vbus_det_irq < 0))
> -		data->phy0_poll = true;
> -
>  	if (data->id_det_irq >= 0) {
>  		ret = devm_request_irq(dev, data->id_det_irq,
>  				sun4i_usb_phy0_id_vbus_det_irq,
> @@ -684,6 +697,7 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> +	data->vbus_det_irq = gpiod_to_irq(data->vbus_det_gpio);
>  	if (data->vbus_det_irq >= 0) {
>  		ret = devm_request_irq(dev, data->vbus_det_irq,
>  				sun4i_usb_phy0_id_vbus_det_irq,
> @@ -735,7 +749,7 @@ static const struct sun4i_usb_phy_cfg sun5i_a13_cfg = {
>  
>  static const struct sun4i_usb_phy_cfg sun6i_a31_cfg = {
>  	.num_phys = 3,
> -	.type = sun4i_a10_phy,
> +	.type = sun6i_a31_phy,
>  	.disc_thresh = 3,
>  	.phyctl_offset = REG_PHYCTL_A10,
>  	.dedicated_clocks = true,
>