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usb: cdns3: gadget: Fix g_audio use case when connected to Super-Speed host

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Take into account gadget driver's speed limit when programming
controller speed.

Fixes: 7733f6c32e ("usb: cdns3: Add Cadence USB3 DRD Driver")
Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
Link: https://lore.kernel.org/r/20191030121607.21739-1-rogerq@ti.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Roger Quadros 2019-10-30 14:16:07 +02:00 committed by Greg Kroah-Hartman
parent f5c8d29063
commit 94e259f81a
1 changed files with 26 additions and 5 deletions
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31
drivers/usb/cdns3/gadget.c
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@ -2343,9 +2343,35 @@ static int cdns3_gadget_udc_start(struct usb_gadget *gadget,
{
struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
unsigned long flags;
enum usb_device_speed max_speed = driver->max_speed;
spin_lock_irqsave(&priv_dev->lock, flags);
priv_dev->gadget_driver = driver;
/* limit speed if necessary */
max_speed = min(driver->max_speed, gadget->max_speed);
switch (max_speed) {
case USB_SPEED_FULL:
writel(USB_CONF_SFORCE_FS, &priv_dev->regs->usb_conf);
writel(USB_CONF_USB3DIS, &priv_dev->regs->usb_conf);
break;
case USB_SPEED_HIGH:
writel(USB_CONF_USB3DIS, &priv_dev->regs->usb_conf);
break;
case USB_SPEED_SUPER:
break;
default:
dev_err(priv_dev->dev,
"invalid maximum_speed parameter %d\n",
max_speed);
/* fall through */
case USB_SPEED_UNKNOWN:
/* default to superspeed */
max_speed = USB_SPEED_SUPER;
break;
}
cdns3_gadget_config(priv_dev);
spin_unlock_irqrestore(&priv_dev->lock, flags);
return 0;
@ -2575,12 +2601,7 @@ static int cdns3_gadget_start(struct cdns3 *cdns)
/* Check the maximum_speed parameter */
switch (max_speed) {
case USB_SPEED_FULL:
writel(USB_CONF_SFORCE_FS, &priv_dev->regs->usb_conf);
writel(USB_CONF_USB3DIS, &priv_dev->regs->usb_conf);
break;
case USB_SPEED_HIGH:
writel(USB_CONF_USB3DIS, &priv_dev->regs->usb_conf);
break;
case USB_SPEED_SUPER:
break;
default: