usb: dwc3: core: move the core check before soft reset

We read the DWC3_GSNPSID register to make sure we got the correct
register offset passed. One of the recent commits moved the soft reset
before this so in case of the wrong offset we end up with "reset timed
out". This patch moves the "id" check before the reset again.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 9 insertions, 10 deletions

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 443e4fb9b8f3..6aa091339989 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -241,6 +241,15 @@ static int __devinit dwc3_core_init(struct dwc3 *dwc)
         u32                     reg;
         int                     ret;
 
+        reg = dwc3_readl(dwc->regs, DWC3_GSNPSID);
+        /* This should read as U3 followed by revision number */
+        if ((reg & DWC3_GSNPSID_MASK) != 0x55330000) {
+                dev_err(dwc->dev, "this is not a DesignWare USB3 DRD Core\n");
+                ret = -ENODEV;
+                goto err0;
+        }
+        dwc->revision = reg & DWC3_GSNPSREV_MASK;
+
         dwc3_core_soft_reset(dwc);
 
         /* issue device SoftReset too */
@@ -260,16 +269,6 @@ static int __devinit dwc3_core_init(struct dwc3 *dwc)
                 cpu_relax();
         } while (true);
 
-        reg = dwc3_readl(dwc->regs, DWC3_GSNPSID);
-        /* This should read as U3 followed by revision number */
-        if ((reg & DWC3_GSNPSID_MASK) != 0x55330000) {
-                dev_err(dwc->dev, "this is not a DesignWare USB3 DRD Core\n");
-                ret = -ENODEV;
-                goto err0;
-        }
-
-        dwc->revision = reg & DWC3_GSNPSREV_MASK;
-
         ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_NUM,
                         DWC3_EVENT_BUFFERS_SIZE);
         if (ret) {