Commit 8327f281 authored by P33M's avatar P33M Committed by popcornmix
Browse files

dwc_otg: add module parameter int_ep_interval_min 

Add a module parameter (defaulting to ignored) that clamps the polling rate
of high-speed Interrupt endpoints to a minimum microframe interval.

The parameter is modifiable at runtime as it is used when activating new
endpoints (such as on device connect).
parent 737cc547

drivers/usb/host/dwc_otg/dwc_otg_driver.c

+5 −1
Original line number Diff line number Diff line
@@ -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.

 */
@@ -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"

 *

drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c

+12 −13
Original line number Diff line number Diff line
@@ -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
@@ -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))) {

		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");