From: "Li, Zhen-Hua" <zhen-hual@xxxxxx>
This patch is trying to fix bug QXCR1001261767.
On some HP platform, when usb driver inits the iLo Virtual USB Controller, there may be a warning "Controller not stopped yet!". It is because driver does not wait enough time.
This patch adds more time waiting and retries.
Signed-off-by: Li, Zhen-Hua <zhen-hual@xxxxxx>
---
drivers/usb/host/uhci-hcd.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index 4a86b63..514e9d7 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -277,6 +277,9 @@ static int global_suspend_mode_is_broken(struct uhci_hcd *uhci)
uhci->global_suspend_mode_is_broken(uhci) : 0;
}
+#define UHCI_SUSPENDRH_RETRY_MAX 10
+#define UHCI_SUSPENDRH_RETRY_DELAY 100
+
static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state)
__releases(uhci->lock)
__acquires(uhci->lock)
@@ -284,6 +287,7 @@ __acquires(uhci->lock)
int auto_stop;
int int_enable, egsm_enable, wakeup_enable;
struct usb_device *rhdev = uhci_to_hcd(uhci)->self.root_hub;
+ u16 try, stopped;
auto_stop = (new_state == UHCI_RH_AUTO_STOPPED);
dev_dbg(&rhdev->dev, "%s%s\n", __func__,
@@ -355,7 +359,17 @@ __acquires(uhci->lock)
if (uhci->dead)
return;
}
- if (!(uhci_readw(uhci, USBSTS) & USBSTS_HCH))
+
+ for (try = 0; try < UHCI_SUSPENDRH_RETRY_MAX; try++) {
+ /*
+ * Sometimes we may need to wait more time and try again.
+ */
+ stopped = uhci_readw(uhci, USBSTS) & USBSTS_HCH;
+ if (stopped)
+ break;
+ udelay(UHCI_SUSPENDRH_RETRY_DELAY);
+ }
+ if (!stopped)
dev_warn(uhci_dev(uhci), "Controller not stopped yet!\n");
uhci_get_current_frame_number(uhci);
--
1.7.10.4
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