68 lines
2.7 KiB
Diff
68 lines
2.7 KiB
Diff
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From 370cbdb4a5ec521d9312b02bbaf269ed520b1451 Mon Sep 17 00:00:00 2001
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From: P33M <P33M@github.com>
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Date: Mon, 22 Apr 2013 00:08:36 +0100
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Subject: [PATCH 060/174] dwc_otg: fix NAK holdoff and allow on split
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transactions only
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This corrects a bug where if a single active non-periodic endpoint
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had at least one transaction in its qh, on frnum == MAX_FRNUM the qh
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would get skipped and never get queued again. This would result in
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a silent device until error detection (automatic or otherwise) would
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either reset the device or flush and requeue the URBs.
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Additionally the NAK holdoff was enabled for all transactions - this
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would potentially stall a HS endpoint for 1ms if a previous error state
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enabled this interrupt and the next response was a NAK. Fix so that
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only split transactions get held off.
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---
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drivers/usb/host/dwc_otg/dwc_otg_hcd.c | 28 ++++++++++++++++++----------
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1 file changed, 18 insertions(+), 10 deletions(-)
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--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd.c
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+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd.c
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@@ -46,7 +46,7 @@
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#include "dwc_otg_hcd.h"
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#include "dwc_otg_regs.h"
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-extern bool microframe_schedule;
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+extern bool microframe_schedule, nak_holdoff_enable;
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//#define DEBUG_HOST_CHANNELS
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#ifdef DEBUG_HOST_CHANNELS
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@@ -1349,18 +1349,26 @@ dwc_otg_transaction_type_e dwc_otg_hcd_s
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/*
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* Check to see if this is a NAK'd retransmit, in which case ignore for retransmission
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- * we hold off on bulk retransmissions to reduce NAK interrupt overhead for
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+ * we hold off on bulk retransmissions to reduce NAK interrupt overhead for full-speed
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* cheeky devices that just hold off using NAKs
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*/
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- if (dwc_full_frame_num(qh->nak_frame) == dwc_full_frame_num(dwc_otg_hcd_get_frame_number(hcd))) {
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- // Make fiq interrupt run on next frame (i.e. 8 uframes)
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- g_next_sched_frame = ((qh->nak_frame + 8) & ~7) & DWC_HFNUM_MAX_FRNUM;
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- qh_ptr = DWC_LIST_NEXT(qh_ptr);
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- continue;
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+ if (nak_holdoff_enable && qh->do_split) {
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+ if (qh->nak_frame != 0xffff &&
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+ dwc_full_frame_num(qh->nak_frame) ==
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+ dwc_full_frame_num(dwc_otg_hcd_get_frame_number(hcd))) {
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+ /*
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+ * Revisit: Need to avoid trampling on periodic scheduling.
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+ * Currently we are safe because g_np_count != g_np_sent whenever we hit this,
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+ * but if this behaviour is changed then periodic endpoints will get a slower
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+ * polling rate.
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+ */
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+ g_next_sched_frame = ((qh->nak_frame + 8) & ~7) & DWC_HFNUM_MAX_FRNUM;
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+ qh_ptr = DWC_LIST_NEXT(qh_ptr);
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+ continue;
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+ } else {
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+ qh->nak_frame = 0xffff;
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+ }
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}
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- else
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- qh->nak_frame = 0xffff;
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-
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if (microframe_schedule) {
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DWC_SPINLOCK_IRQSAVE(channel_lock, &flags);
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if (hcd->available_host_channels < 1) {
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