Synopsys Databook says we should move link to U0
before issuing a Start Transfer command. We could
require the gadget driver to call
usb_gadget_wakeup() however I feel that changing all
gagdget drivers to keep track of Link State and
conditionally call usb_gadget_wakeup() would be far
too much work. For now we will handle this at the
UDC level, but at some point composite.c should be
one handling this.
Signed-off-by: Felipe Balbi <felipe.ba...@linux.intel.com>
---
drivers/usb/dwc3/gadget.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 552ebdf972b4..404573fcb3c9 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -221,6 +221,8 @@ int dwc3_send_gadget_generic_command(struct dwc3 *dwc,
unsigned cmd, u32 param)
} while (1);
}
+static int __dwc3_gadget_wakeup(struct dwc3 *dwc);
+
int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
unsigned cmd, struct dwc3_gadget_ep_cmd_params *params)
{
@@ -242,12 +244,24 @@ int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
* by the same section on Synopsys databook.
*/
if (cmd == DWC3_DEPCMD_STARTTRANSFER) {
+ int needs_wakeup;
+
reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
if (unlikely(reg & DWC3_GUSB2PHYCFG_SUSPHY)) {
susphy = true;
reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
}
+
+ needs_wakeup = (dwc->link_state == DWC3_LINK_STATE_U1 ||
+ dwc->link_state == DWC3_LINK_STATE_U2 ||
+ dwc->link_state == DWC3_LINK_STATE_U3);
+
+ if (unlikely(needs_wakeup)) {
+ ret = __dwc3_gadget_wakeup(dwc);
+ dev_WARN_ONCE(dwc->dev, ret, "wakeup failed --> %d\n",
+ ret);
+ }
}
dwc3_writel(dwc->regs, DWC3_DEPCMDPAR0(ep), params->param0);
--
2.8.0.rc2
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