diff mbox series

[V2,2/8] usb: gadget: tegra-xudc: Add vbus_draw support

Message ID 1586939108-10075-3-git-send-email-nkristam@nvidia.com
State New
Headers show
Series Tegra XUSB charger detect support | expand

Commit Message

Nagarjuna Kristam April 15, 2020, 8:25 a.m. UTC
Register vbus_draw to gadget ops and update corresponding vbus
draw current to usb_phy.

Signed-off-by: Nagarjuna Kristam <nkristam@nvidia.com>
---
V2:
 - Patch re-based.
---
 drivers/usb/gadget/udc/tegra-xudc.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

Comments

Thierry Reding April 28, 2020, 9:59 a.m. UTC | #1
On Wed, Apr 15, 2020 at 01:55:02PM +0530, Nagarjuna Kristam wrote:
> Register vbus_draw to gadget ops and update corresponding vbus
> draw current to usb_phy.
> 
> Signed-off-by: Nagarjuna Kristam <nkristam@nvidia.com>
> ---
> V2:
>  - Patch re-based.
> ---
>  drivers/usb/gadget/udc/tegra-xudc.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/usb/gadget/udc/tegra-xudc.c b/drivers/usb/gadget/udc/tegra-xudc.c
> index 52a6add..9d3c109 100644
> --- a/drivers/usb/gadget/udc/tegra-xudc.c
> +++ b/drivers/usb/gadget/udc/tegra-xudc.c
> @@ -492,6 +492,7 @@ struct tegra_xudc {
>  	bool powergated;
>  
>  	struct usb_phy **usbphy;
> +	struct usb_phy *curr_usbphy;
>  	struct notifier_block vbus_nb;
>  
>  	struct completion disconnect_complete;
> @@ -719,6 +720,7 @@ static int tegra_xudc_vbus_notify(struct notifier_block *nb,
>  	if (!xudc->suspended && phy_index != -1) {
>  		xudc->curr_utmi_phy = xudc->utmi_phy[phy_index];
>  		xudc->curr_usb3_phy = xudc->usb3_phy[phy_index];
> +		xudc->curr_usbphy = usbphy;
>  		schedule_work(&xudc->usb_role_sw_work);
>  	}
>  
> @@ -2042,6 +2044,19 @@ static int tegra_xudc_gadget_stop(struct usb_gadget *gadget)
>  	return 0;
>  }
>  
> +static int tegra_xudc_gadget_vbus_draw(struct usb_gadget *gadget,
> +						unsigned int m_a)
> +{
> +	struct tegra_xudc *xudc = to_xudc(gadget);
> +
> +	dev_dbg(xudc->dev, "%s: %u mA\n", __func__, m_a);
> +
> +	if (xudc->curr_usbphy->chg_type == SDP_TYPE)
> +		usb_phy_set_power(xudc->curr_usbphy, m_a);

Do we need to propagate the error code here in case the USB PHY for some
reason doesn't support the given current? Or is it guaranteed that we
always do support whatever is passed in here?

Regardless of whether we support it or not, it might still be useful to
add proper handling, if for nothing else but to set a good example.

Thierry
Nagarjuna Kristam May 4, 2020, 4:10 a.m. UTC | #2
On 28-04-2020 15:29, Thierry Reding wrote:
>> @@ -2042,6 +2044,19 @@ static int tegra_xudc_gadget_stop(struct usb_gadget *gadget)
>>   	return 0;
>>   }
>>   
>> +static int tegra_xudc_gadget_vbus_draw(struct usb_gadget *gadget,
>> +						unsigned int m_a)
>> +{
>> +	struct tegra_xudc *xudc = to_xudc(gadget);
>> +
>> +	dev_dbg(xudc->dev, "%s: %u mA\n", __func__, m_a);
>> +
>> +	if (xudc->curr_usbphy->chg_type == SDP_TYPE)
>> +		usb_phy_set_power(xudc->curr_usbphy, m_a);
> Do we need to propagate the error code here in case the USB PHY for some
> reason doesn't support the given current? Or is it guaranteed that we
> always do support whatever is passed in here?
> 
> Regardless of whether we support it or not, it might still be useful to
> add proper handling, if for nothing else but to set a good example.
> 
> Thierry
Will update accordingly, propagate the return the code to caller.
diff mbox series

Patch

diff --git a/drivers/usb/gadget/udc/tegra-xudc.c b/drivers/usb/gadget/udc/tegra-xudc.c
index 52a6add..9d3c109 100644
--- a/drivers/usb/gadget/udc/tegra-xudc.c
+++ b/drivers/usb/gadget/udc/tegra-xudc.c
@@ -492,6 +492,7 @@  struct tegra_xudc {
 	bool powergated;
 
 	struct usb_phy **usbphy;
+	struct usb_phy *curr_usbphy;
 	struct notifier_block vbus_nb;
 
 	struct completion disconnect_complete;
@@ -719,6 +720,7 @@  static int tegra_xudc_vbus_notify(struct notifier_block *nb,
 	if (!xudc->suspended && phy_index != -1) {
 		xudc->curr_utmi_phy = xudc->utmi_phy[phy_index];
 		xudc->curr_usb3_phy = xudc->usb3_phy[phy_index];
+		xudc->curr_usbphy = usbphy;
 		schedule_work(&xudc->usb_role_sw_work);
 	}
 
@@ -2042,6 +2044,19 @@  static int tegra_xudc_gadget_stop(struct usb_gadget *gadget)
 	return 0;
 }
 
+static int tegra_xudc_gadget_vbus_draw(struct usb_gadget *gadget,
+						unsigned int m_a)
+{
+	struct tegra_xudc *xudc = to_xudc(gadget);
+
+	dev_dbg(xudc->dev, "%s: %u mA\n", __func__, m_a);
+
+	if (xudc->curr_usbphy->chg_type == SDP_TYPE)
+		usb_phy_set_power(xudc->curr_usbphy, m_a);
+
+	return 0;
+}
+
 static int tegra_xudc_set_selfpowered(struct usb_gadget *gadget, int is_on)
 {
 	struct tegra_xudc *xudc = to_xudc(gadget);
@@ -2058,6 +2073,7 @@  static struct usb_gadget_ops tegra_xudc_gadget_ops = {
 	.pullup = tegra_xudc_gadget_pullup,
 	.udc_start = tegra_xudc_gadget_start,
 	.udc_stop = tegra_xudc_gadget_stop,
+	.vbus_draw = tegra_xudc_gadget_vbus_draw,
 	.set_selfpowered = tegra_xudc_set_selfpowered,
 };