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dwc_otg: add module parameter int_ep_interval_min #2067

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Merged
merged 1 commit into from
Jun 12, 2017
Merged

dwc_otg: add module parameter int_ep_interval_min #2067

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6 changes: 5 additions & 1 deletion drivers/usb/host/dwc_otg/dwc_otg_driver.c
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Original file line number Diff line number Diff line change
Expand Up @@ -249,6 +249,7 @@ uint16_t nak_holdoff = 8;

unsigned short fiq_fsm_mask = 0x0F;

unsigned short int_ep_interval_min = 0;
/**
* This function shows the Driver Version.
*/
Expand Down Expand Up @@ -1398,7 +1399,10 @@ MODULE_PARM_DESC(fiq_fsm_mask, "Bitmask of transactions to perform in the FIQ.\n
"Bit 1 : Periodic split transactions\n"
"Bit 2 : High-speed multi-transfer isochronous\n"
"All other bits should be set 0.");

module_param(int_ep_interval_min, ushort, 0644);
MODULE_PARM_DESC(int_ep_interval_min, "Clamp high-speed Interrupt endpoints to a minimum polling interval.\n"
"0..1 = Use endpoint default\n"
"2..n = Minimum interval n microframes. Use powers of 2.\n");

/** @page "Module Parameters"
*
Expand Down
25 changes: 12 additions & 13 deletions drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,7 @@
#include "dwc_otg_regs.h"

extern bool microframe_schedule;
extern unsigned short int_ep_interval_min;

/**
* Free each QTD in the QH's QTD-list then free the QH. QH should already be
Expand Down Expand Up @@ -218,21 +219,19 @@ void qh_init(dwc_otg_hcd_t * hcd, dwc_otg_qh_t * qh, dwc_otg_hcd_urb_t * urb)
SCHEDULE_SLOP);
qh->interval = urb->interval;

#if 0
/* Increase interrupt polling rate for debugging. */
if (qh->ep_type == UE_INTERRUPT) {
qh->interval = 8;
}
#endif
hprt.d32 = DWC_READ_REG32(hcd->core_if->host_if->hprt0);
if ((hprt.b.prtspd == DWC_HPRT0_PRTSPD_HIGH_SPEED) &&
((dev_speed == USB_SPEED_LOW) ||
(dev_speed == USB_SPEED_FULL))) {
qh->interval *= 8;
qh->sched_frame |= 0x7;
qh->start_split_frame = qh->sched_frame;
if (hprt.b.prtspd == DWC_HPRT0_PRTSPD_HIGH_SPEED) {
if (dev_speed == USB_SPEED_LOW ||
dev_speed == USB_SPEED_FULL) {
qh->interval *= 8;
qh->sched_frame |= 0x7;
qh->start_split_frame = qh->sched_frame;
} else if (int_ep_interval_min >= 2 &&
qh->interval < int_ep_interval_min &&
qh->ep_type == UE_INTERRUPT) {
qh->interval = int_ep_interval_min;
}
}

}

DWC_DEBUGPL(DBG_HCD, "DWC OTG HCD QH Initialized\n");
Expand Down