On 2023/4/21 22:59, Alan Stern wrote:
On Sat, Apr 22, 2023 at 01:41:42AM +0800, Weitao Wang wrote:
OverCurrent condition is not standardized in the UHCI spec.
Zhaoxin UHCI controllers report OverCurrent bit active off.
In order to handle OverCurrent condition correctly, the uhci-hcd
driver needs to be told to expect the active-off behavior.
Suggested-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Weitao Wang <WeitaoWang-oc@xxxxxxxxxxx>
---
v1->v2
- Modify the description of this patch.
- Let Zhaoxin and VIA share a common oc_low flag
drivers/usb/host/uhci-pci.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/host/uhci-pci.c b/drivers/usb/host/uhci-pci.c
index 3592f757fe05..034586911bb5 100644
--- a/drivers/usb/host/uhci-pci.c
+++ b/drivers/usb/host/uhci-pci.c
@@ -119,11 +119,12 @@ static int uhci_pci_init(struct usb_hcd *hcd)
uhci->rh_numports = uhci_count_ports(hcd);
- /* Intel controllers report the OverCurrent bit active on.
- * VIA controllers report it active off, so we'll adjust the
- * bit value. (It's not standardized in the UHCI spec.)
+ /* Intel controllers report the OverCurrent bit active on. VIA
+ * and ZHAOXIN controllers report it active off, so we'll adjust
+ * the bit value. (It's not standardized in the UHCI spec.)
*/
The style we use now for multi-line comments is:
/*
* Blah blah blah
* blah blah blah
*/
- if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_VIA)
+ if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_VIA ||
+ to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_ZHAOXIN)
The indentation level of the continuation line should be different from
the indentation of the statement below. Otherwise it looks like the
continuation line is part of the conditional block.
I see, Thanks for your careful examination. I'll change it later.
Best Regards,
Weitao
Alan Stern
uhci->oc_low = 1;
/* HP's server management chip requires a longer port reset delay. */
--
2.32.0
.
