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usb: dwc3: Fix dwc3 version and revisions in remote wakeup path

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Currently inorder to issue remote wakup to host, we perform some
register operations which are needed only for DWC3_IP versions
>= 194A, but we do perform operations for DWC31_IP controllers as
well, which is not expected. Hence cleanup the IP and revisions
of DWC3 in remote wakup path.

Change-Id: Idede7b05b1fb53fe582c6e2d7483784d578a9738
Signed-off-by: Prashanth K <quic_prashk@quicinc.com>
This commit is contained in:
Prashanth K 2024-06-18 15:38:47 +05:30
commit 00d7d1195d
1 changed files with 6 additions and 9 deletions
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15
drivers/usb/dwc3/gadget.c
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@ -100,7 +100,7 @@ int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
* Wait until device controller is ready. Only applies to 1.94a and
* later RTL.
*/
if (dwc->revision >= DWC3_REVISION_194A) {
if (dwc3_is_usb3(dwc) && dwc->revision >= DWC3_REVISION_194A) {
while (--retries) {
reg = dwc3_readl(dwc->regs, DWC3_DSTS);
if (reg & DWC3_DSTS_DCNRD)
@ -124,7 +124,7 @@ int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
* The following code is racy when called from dwc3_gadget_wakeup,
* and is not needed, at least on newer versions
*/
if (dwc->revision >= DWC3_REVISION_194A)
if (dwc3_is_usb3(dwc) && dwc->revision >= DWC3_REVISION_194A)
return 0;
/* wait for a change in DSTS */
@ -2116,13 +2116,10 @@ static int dwc3_gadget_remote_wakeup(struct dwc3 *dwc)
goto out;
}
/* Recent versions do this automatically */
if (dwc->revision < DWC3_REVISION_194A) {
/* write zeroes to Link Change Request */
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
}
/* write zeroes to Link Change Request */
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
spin_unlock_irqrestore(&dwc->lock, flags);
enable_irq(dwc->irq);