Hello.
On 02/25/2014 10:40 PM, Felipe Balbi wrote:
From: Paul Zimmerman <Paul.Zimmerman@xxxxxxxxxxxx>
This function will be used during hibernation to get
the current link state. It will be needed at least
for Hibernation support.
Signed-off-by: Paul Zimmerman <paulz@xxxxxxxxxxxx>
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
---
drivers/usb/dwc3/gadget.c | 36 ++++++++++++++++++++++++++++++++++++
drivers/usb/dwc3/gadget.h | 1 +
2 files changed, 37 insertions(+)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 31b13c2..ff10161 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -68,6 +68,42 @@ int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
}
/**
+ * dwc3_gadget_get_lik_state - Gets current state of USB Link
+ * @dwc: pointer to our context structure
+ *
+ * Caller should take care of locking. This function will
+ * return the link state on success (>= 0) or -ETIMEDOUT.
+ */
+int dwc3_gadget_get_link_state(struct dwc3 *dwc)
+{
+ u32 reg;
+
+ reg = dwc3_readl(dwc->regs, DWC3_DSTS);
+
+ /*
+ * Wait until device controller is ready.
+ * (This only applied to 1.94a and later
+ * RTL releases)
+ */
+ if (dwc->revision >= DWC3_REVISION_194A) {
+ int retries = 10000;
+
+ do {
+ reg = dwc3_readl(dwc->regs, DWC3_DSTS);
+ if (!(reg & DWC3_DSTS_DCNRD))
+ break;
+
+ if (!retries)
Hm, I doubt this will ever be true. This check would be meaningful after
the loop...
+ return -ETIMEDOUT;
+
+ udelay(5);
+ } while (--retries);
+ }
+
+ return DWC3_DSTS_USBLNKST(reg);
+}
WBR, Sergei
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