usb: dwc3: ep0: Make USB30CV happy with SetAddress

According to USB 3.0 Specification, a SetAddress()
while device is in Configured State has an unspecified
behavior (see Section 9.4.6). Still USB30CV wasn't
happy with my Stall reply.

To make that thing happy, just accept the SetAddress()
always. No problems have been observed thus far.

Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 9 insertions, 22 deletions

diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index b66d96905728..e058961a547c 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -421,7 +421,6 @@ static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
 
 static int dwc3_ep0_set_address(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 {
-        int ret = 0;
         u32 addr;
         u32 reg;
 
@@ -429,29 +428,17 @@ static int dwc3_ep0_set_address(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
         if (addr > 127)
                 return -EINVAL;
 
-        switch (dwc->dev_state) {
-        case DWC3_DEFAULT_STATE:
-        case DWC3_ADDRESS_STATE:
-                /*
-                 * Not sure if we should program DevAddr now or later
-                 */
-                reg = dwc3_readl(dwc->regs, DWC3_DCFG);
-                reg &= ~(DWC3_DCFG_DEVADDR_MASK);
-                reg |= DWC3_DCFG_DEVADDR(addr);
-                dwc3_writel(dwc->regs, DWC3_DCFG, reg);
-
-                if (addr)
-                        dwc->dev_state = DWC3_ADDRESS_STATE;
-                else
-                        dwc->dev_state = DWC3_DEFAULT_STATE;
-                break;
+        reg = dwc3_readl(dwc->regs, DWC3_DCFG);
+        reg &= ~(DWC3_DCFG_DEVADDR_MASK);
+        reg |= DWC3_DCFG_DEVADDR(addr);
+        dwc3_writel(dwc->regs, DWC3_DCFG, reg);
 
-        case DWC3_CONFIGURED_STATE:
-                ret = -EINVAL;
-                break;
-        }
+        if (addr)
+                dwc->dev_state = DWC3_ADDRESS_STATE;
+        else
+                dwc->dev_state = DWC3_DEFAULT_STATE;
 
-        return ret;
+        return 0;
 }
 
 static int dwc3_ep0_delegate_req(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)