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USB: Retry GetPortStatus if HUB returns 2 bytes instead of 4 

Internal HUB present in ISP1763A sometimes returns 2 bytes of
data in response to GetPortStatus request. This is observed during
mutiple iterations of suspend/resume with ISP1763A.
As part of workaround retry GetPortStatus request if HUB
returns 2 bytes.

Change-Id: Iae28abe0d9e082e4741e585e085d9fb9e6e7594a
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
This commit is contained in:
Manu Gautam 2011-05-10 16:09:38 +05:30 committed by Stephen Boyd
parent 1716ce8004
commit 7ea3ab4ec2
1 changed files with 4 additions and 1 deletions
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5
drivers/usb/core/hub.c
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@ -563,8 +563,11 @@ static int get_port_status(struct usb_device *hdev, int port1,
{
int i, status = -ETIMEDOUT;
/* ISP1763A HUB sometimes returns 2 bytes instead of 4 bytes, retry
* if this happens
*/
for (i = 0; i < USB_STS_RETRIES &&
(status == -ETIMEDOUT || status == -EPIPE); i++) {
(status == -ETIMEDOUT || status == -EPIPE || status == 2); i++) {
status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
data, sizeof(*data), USB_STS_TIMEOUT);