usb: dwc3: ep0: add LPM handling
On device loading the driver enables LPM and the acceptance of U1 and U2
states. The [Set|Clear]Feature requests for "U1/U2" are forwarded
directly to the hardware and allow / forbid the initiation of the low
power links.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 25910e2..18494b0 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -261,6 +261,7 @@
{
struct dwc3_ep *dep;
u32 recip;
+ u32 reg;
u16 usb_status = 0;
__le16 *response_pkt;
@@ -268,10 +269,18 @@
switch (recip) {
case USB_RECIP_DEVICE:
/*
- * We are self-powered. U1/U2/LTM will be set later
- * once we handle this states. RemoteWakeup is 0 on SS
+ * LTM will be set once we know how to set this in HW.
*/
usb_status |= dwc->is_selfpowered << USB_DEVICE_SELF_POWERED;
+
+ if (dwc->speed == DWC3_DSTS_SUPERSPEED) {
+ reg = dwc3_readl(dwc->regs, DWC3_DCTL);
+ if (reg & DWC3_DCTL_INITU1ENA)
+ usb_status |= 1 << USB_DEV_STAT_U1_ENABLED;
+ if (reg & DWC3_DCTL_INITU2ENA)
+ usb_status |= 1 << USB_DEV_STAT_U2_ENABLED;
+ }
+
break;
case USB_RECIP_INTERFACE:
@@ -312,6 +321,7 @@
u32 recip;
u32 wValue;
u32 wIndex;
+ u32 reg;
int ret;
wValue = le16_to_cpu(ctrl->wValue);
@@ -320,29 +330,43 @@
switch (recip) {
case USB_RECIP_DEVICE:
+ switch (wValue) {
+ case USB_DEVICE_REMOTE_WAKEUP:
+ break;
/*
* 9.4.1 says only only for SS, in AddressState only for
* default control pipe
*/
- switch (wValue) {
case USB_DEVICE_U1_ENABLE:
- case USB_DEVICE_U2_ENABLE:
- case USB_DEVICE_LTM_ENABLE:
if (dwc->dev_state != DWC3_CONFIGURED_STATE)
return -EINVAL;
if (dwc->speed != DWC3_DSTS_SUPERSPEED)
return -EINVAL;
- }
- /* XXX add U[12] & LTM */
- switch (wValue) {
- case USB_DEVICE_REMOTE_WAKEUP:
+ reg = dwc3_readl(dwc->regs, DWC3_DCTL);
+ if (set)
+ reg |= DWC3_DCTL_INITU1ENA;
+ else
+ reg &= ~DWC3_DCTL_INITU1ENA;
+ dwc3_writel(dwc->regs, DWC3_DCTL, reg);
break;
- case USB_DEVICE_U1_ENABLE:
- break;
+
case USB_DEVICE_U2_ENABLE:
+ if (dwc->dev_state != DWC3_CONFIGURED_STATE)
+ return -EINVAL;
+ if (dwc->speed != DWC3_DSTS_SUPERSPEED)
+ return -EINVAL;
+
+ reg = dwc3_readl(dwc->regs, DWC3_DCTL);
+ if (set)
+ reg |= DWC3_DCTL_INITU2ENA;
+ else
+ reg &= ~DWC3_DCTL_INITU2ENA;
+ dwc3_writel(dwc->regs, DWC3_DCTL, reg);
break;
+
case USB_DEVICE_LTM_ENABLE:
+ return -EINVAL;
break;
case USB_DEVICE_TEST_MODE: