openwrt/target/linux/brcm2708/patches-3.10/0085-dwc_otg-fiq_split-use-TTs-with-more-granularity.patch

From 2b66f2f4f07ed87db0e241489d4e93881fe50a85 Mon Sep 17 00:00:00 2001
From: P33M <P33M@github.com>
Date: Tue, 30 Jul 2013 09:58:48 +0100
Subject: [PATCH 085/174] dwc_otg: fiq_split: use TTs with more granularity

This fixes certain issues with split transaction scheduling.

- Isochronous multi-packet OUT transactions now hog the TT until
  they are completed - this prevents hubs aborting transactions
  if they get a periodic start-split out-of-order
- Don't perform TT allocation on non-periodic endpoints - this
  allows simultaneous use of the TT's bulk/control and periodic
  transaction buffers

This commit will mainly affect USB audio playback.
---
 drivers/usb/host/dwc_otg/dwc_otg_hcd.c      | 26 +++++++++++++-------------
 drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c | 20 ++++++++++++++++----
 2 files changed, 29 insertions(+), 17 deletions(-)

--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd.c
+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd.c
@@ -1356,6 +1356,7 @@ dwc_otg_transaction_type_e dwc_otg_hcd_s
 {
 	dwc_list_link_t *qh_ptr;
 	dwc_otg_qh_t *qh;
+	dwc_otg_qtd_t *qtd;
 	int num_channels;
 	dwc_irqflags_t flags;
 	dwc_spinlock_t *channel_lock = hcd->channel_lock;
@@ -1379,11 +1380,18 @@ dwc_otg_transaction_type_e dwc_otg_hcd_s
 
 		qh = DWC_LIST_ENTRY(qh_ptr, dwc_otg_qh_t, qh_list_entry);
 
-		if(qh->do_split && dwc_otg_hcd_allocate_port(hcd, qh))
-		{
-			qh_ptr = DWC_LIST_NEXT(qh_ptr);
-			g_next_sched_frame = dwc_frame_num_inc(dwc_otg_hcd_get_frame_number(hcd), 1);
-			continue;
+		if(qh->do_split) {
+			qtd = DWC_CIRCLEQ_FIRST(&qh->qtd_list);
+			if(!(qh->ep_type == UE_ISOCHRONOUS &&
+					(qtd->isoc_split_pos == DWC_HCSPLIT_XACTPOS_MID ||
+					qtd->isoc_split_pos == DWC_HCSPLIT_XACTPOS_END))) {
+				if(dwc_otg_hcd_allocate_port(hcd, qh))
+				{
+					qh_ptr = DWC_LIST_NEXT(qh_ptr);
+					g_next_sched_frame = dwc_frame_num_inc(dwc_otg_hcd_get_frame_number(hcd), 1);
+					continue;
+				}
+			}
 		}
 
 		if (microframe_schedule) {
@@ -1451,18 +1459,10 @@ dwc_otg_transaction_type_e dwc_otg_hcd_s
 			}
 		}
 
-		if (qh->do_split && dwc_otg_hcd_allocate_port(hcd, qh))
-		{
-			g_next_sched_frame = dwc_frame_num_inc(dwc_otg_hcd_get_frame_number(hcd), 1);
-			qh_ptr = DWC_LIST_NEXT(qh_ptr);
-			continue;
-		}
-
 		if (microframe_schedule) {
 				DWC_SPINLOCK_IRQSAVE(channel_lock, &flags);
 				if (hcd->available_host_channels < 1) {
 					DWC_SPINUNLOCK_IRQRESTORE(channel_lock, flags);
-					if(qh->do_split) dwc_otg_hcd_release_port(hcd, qh);
 					break;
 				}
 				hcd->available_host_channels--;
--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
@@ -1328,10 +1328,20 @@ static void release_channel(dwc_otg_hcd_
 #ifdef FIQ_DEBUG
 	int endp = qtd->urb ? qtd->urb->pipe_info.ep_num : 0;
 #endif
+	int hog_port = 0;
 
 	DWC_DEBUGPL(DBG_HCDV, "  %s: channel %d, halt_status %d, xfer_len %d\n",
 		    __func__, hc->hc_num, halt_status, hc->xfer_len);
 
+	if(fiq_split_enable && hc->do_split) {
+		if(!hc->ep_is_in && hc->ep_type == UE_ISOCHRONOUS) {
+			if(hc->xact_pos == DWC_HCSPLIT_XACTPOS_MID || 
+					hc->xact_pos == DWC_HCSPLIT_XACTPOS_BEGIN) {
+				hog_port = 1;
+			}
+		}
+	}
+
 	switch (halt_status) {
 	case DWC_OTG_HC_XFER_URB_COMPLETE:
 		free_qtd = 1;
@@ -1417,12 +1427,14 @@ cleanup:
 			fiq_print(FIQDBG_ERR, "PRTNOTAL");
 			//BUG();
 		}
-
-		hcd->hub_port[hc->hub_addr] &= ~(1 << hc->port_addr);
+		if(!hog_port && (hc->ep_type == DWC_OTG_EP_TYPE_ISOC ||
+				hc->ep_type == DWC_OTG_EP_TYPE_INTR)) {
+			hcd->hub_port[hc->hub_addr] &= ~(1 << hc->port_addr);
 #ifdef FIQ_DEBUG
-		hcd->hub_port_alloc[hc->hub_addr * 16 + hc->port_addr] = -1;
+			hcd->hub_port_alloc[hc->hub_addr * 16 + hc->port_addr] = -1;
 #endif
-		fiq_print(FIQDBG_PORTHUB, "H%dP%d:RR%d", hc->hub_addr, hc->port_addr, endp);
+			fiq_print(FIQDBG_PORTHUB, "H%dP%d:RR%d", hc->hub_addr, hc->port_addr, endp);
+		}
 	}
 
 	/* Try to queue more transfers now that there's a free channel. */