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usb: dwc2: host: reset frame number after suspend 

Frame number is reset in hardware after exiting hibernation.
Thus, reset frame_number and ensure qh are queued with correct
sched_frame.

Otherwise, qh->sched_frame may be too high compared to
current frame number (which is 0). This can delay addition of qh in
the list of transfers until frame number reaches qh->sched_frame.

Signed-off-by: Gregory Herrero <gregory.herrero@intel.com>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@intel.com>
Tested-by: Robert Baldyga <r.baldyga@samsung.com>
Tested-by: Dinh Nguyen <dinguyen@opensource.altera.com>
Tested-by: John Youn <johnyoun@synopsys.com>
Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Gregory Herrero 2015-09-22 15:16:45 +02:00 committed by Felipe Balbi
parent bea78555f7
commit 08c4ffc240
2 changed files with 9 additions and 0 deletions
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1
drivers/usb/dwc2/core.c
View File

@ -116,6 +116,7 @@ static int dwc2_restore_host_registers(struct dwc2_hsotg *hsotg)
dwc2_writel(hr->hprt0, hsotg->regs + HPRT0);
dwc2_writel(hr->hfir, hsotg->regs + HFIR);
hsotg->frame_number = 0;
return 0;
}

8
drivers/usb/dwc2/hcd_queue.c
View File

@ -583,6 +583,14 @@ int dwc2_hcd_qh_add(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
/* QH already in a schedule */
return 0;
if (!dwc2_frame_num_le(qh->sched_frame, hsotg->frame_number) &&
!hsotg->frame_number) {
dev_dbg(hsotg->dev,
"reset frame number counter\n");
qh->sched_frame = dwc2_frame_num_inc(hsotg->frame_number,
SCHEDULE_SLOP);
}
/* Add the new QH to the appropriate schedule */
if (dwc2_qh_is_non_per(qh)) {
/* Always start in inactive schedule */