[PATCH] usb: dwc2: host: use msleep() for long delays

[Nicholas Mc Guire]

ulseep_range() uses hrtimers and provides no advantage over msleep()
for larger delays. Fix up the 20+ ms delays here passing the adjusted "min"
value to msleep(). This helps reduce the load on the hrtimer subsystem.

Signed-off-by: Nicholas Mc Guire <hof...@osadl.org>
---

Patch was compile tested with: x86_64_defconfig + CONFIG_USB_DWC2
(1 sparse and 6 coccinelle warning - preparing separate patches for that)

Patch is against 4.10-rc3 (localversion-next is next-20170112)

 drivers/usb/dwc2/hcd.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 911c3b3..37ee72d 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -2150,7 +2150,7 @@ static int dwc2_hcd_endpoint_disable(struct dwc2_hsotg 
*hsotg,
                }
 
                spin_unlock_irqrestore(&hsotg->lock, flags);
-               usleep_range(20000, 40000);
+               msleep(20);
                spin_lock_irqsave(&hsotg->lock, flags);
                qh = ep->hcpriv;
                if (!qh) {
@@ -3240,7 +3240,7 @@ static void dwc2_conn_id_status_change(struct work_struct 
*work)
                                 "Waiting for Peripheral Mode, Mode=%s\n",
                                 dwc2_is_host_mode(hsotg) ? "Host" :
                                 "Peripheral");
-                       usleep_range(20000, 40000);
+                       msleep(20);
                        if (++count > 250)
                                break;
                }
@@ -3261,7 +3261,7 @@ static void dwc2_conn_id_status_change(struct work_struct 
*work)
                        dev_info(hsotg->dev, "Waiting for Host Mode, Mode=%s\n",
                                 dwc2_is_host_mode(hsotg) ?
                                 "Host" : "Peripheral");
-                       usleep_range(20000, 40000);
+                       msleep(20);
                        if (++count > 250)
                                break;
                }
@@ -3354,7 +3354,7 @@ static void dwc2_port_suspend(struct dwc2_hsotg *hsotg, 
u16 windex)
 
                spin_unlock_irqrestore(&hsotg->lock, flags);
 
-               usleep_range(200000, 250000);
+               msleep(200);
        } else {
                spin_unlock_irqrestore(&hsotg->lock, flags);
        }
@@ -3378,7 +3378,7 @@ static void dwc2_port_resume(struct dwc2_hsotg *hsotg)
                pcgctl &= ~PCGCTL_STOPPCLK;
                dwc2_writel(pcgctl, hsotg->regs + PCGCTL);
                spin_unlock_irqrestore(&hsotg->lock, flags);
-               usleep_range(20000, 40000);
+               msleep(20);
                spin_lock_irqsave(&hsotg->lock, flags);
        }
 
@@ -3691,7 +3691,7 @@ static int dwc2_hcd_hub_control(struct dwc2_hsotg *hsotg, 
u16 typereq,
                        }
 
                        /* Clear reset bit in 10ms (FS/LS) or 50ms (HS) */
-                       usleep_range(50000, 70000);
+                       msleep(50);
                        hprt0 &= ~HPRT0_RST;
                        dwc2_writel(hprt0, hsotg->regs + HPRT0);
                        hsotg->lx_state = DWC2_L0; /* Now back to On state */
-- 
2.1.4