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usb: dwc2: gadget: fix frame overrun issue

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The frame_overrun flag is used to indicates
SOF number (current_frame) overrun in DSTS
and the target_frame over DSTS_SOFFN_LIMIT.

Clear the frame_overrun flag only if target_frame
below DSTS_SOFFN_LIMIT and current_frame less
than target_frame.

Change-Id: I91cf9001324a9bbbcc4bc28b335695d607fb69d4
Signed-off-by: William Wu <william.wu@rock-chips.com>
This commit is contained in:
William Wu 2018-07-27 12:40:10 +08:00 committed by Tao Huang
parent 504c382d1c
commit 41ff4d6b62
1 changed files with 21 additions and 18 deletions
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39
drivers/usb/dwc2/gadget.c
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@ -97,6 +97,23 @@ static inline bool using_dma(struct dwc2_hsotg *hsotg)
return hsotg->g_using_dma;
}
/**
* dwc2_hsotg_read_frameno - read current frame number
* @hsotg: The device instance
*
* Return the current frame number
*/
static u32 dwc2_hsotg_read_frameno(struct dwc2_hsotg *hsotg)
{
u32 dsts;
dsts = dwc2_readl(hsotg->regs + DSTS);
dsts &= DSTS_SOFFN_MASK;
dsts >>= DSTS_SOFFN_SHIFT;
return dsts;
}
/**
* dwc2_gadget_incr_frame_num - Increments the targeted frame number.
* @hs_ep: The endpoint
@ -107,11 +124,14 @@ static inline bool using_dma(struct dwc2_hsotg *hsotg)
*/
static inline void dwc2_gadget_incr_frame_num(struct dwc2_hsotg_ep *hs_ep)
{
struct dwc2_hsotg *hsotg = hs_ep->parent;
u32 current_frame = dwc2_hsotg_read_frameno(hsotg);
hs_ep->target_frame += hs_ep->interval;
if (hs_ep->target_frame > DSTS_SOFFN_LIMIT) {
hs_ep->frame_overrun = 1;
hs_ep->target_frame &= DSTS_SOFFN_LIMIT;
} else {
} else if (current_frame <= hs_ep->target_frame) {
hs_ep->frame_overrun = 0;
}
}
@ -524,23 +544,6 @@ static unsigned get_ep_limit(struct dwc2_hsotg_ep *hs_ep)
return maxsize;
}
/**
* dwc2_hsotg_read_frameno - read current frame number
* @hsotg: The device instance
*
* Return the current frame number
*/
static u32 dwc2_hsotg_read_frameno(struct dwc2_hsotg *hsotg)
{
u32 dsts;
dsts = dwc2_readl(hsotg->regs + DSTS);
dsts &= DSTS_SOFFN_MASK;
dsts >>= DSTS_SOFFN_SHIFT;
return dsts;
}
/**
* dwc2_hsotg_start_req - start a USB request from an endpoint's queue
* @hsotg: The controller state.