openwrt/target/linux/brcm2708/patches-3.10/0084-dwc_otg-make-channel-halts-with-unknown-state-less-d.patch

From 6ecef9d4e6add518889432cc642a50e47ee3536b Mon Sep 17 00:00:00 2001
From: P33M <P33M@github.com>
Date: Tue, 23 Jul 2013 14:15:32 +0100
Subject: [PATCH 084/196] dwc_otg: make channel halts with unknown state less
 damaging

If the IRQ received a channel halt interrupt through the FIQ
with no other bits set, the IRQ would not release the host
channel and never complete the URB.

Add catchall handling to treat as a transaction error and retry.
---
 drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c b/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
index dbff763..488defb 100644
--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
@@ -2578,12 +2578,24 @@ static void handle_hc_chhltd_intr_dma(dwc_otg_hcd_t * hcd,
 				     DWC_READ_REG32(&hcd->
 						    core_if->core_global_regs->
 						    gintsts));
+				/* Failthrough: use 3-strikes rule */
+				qtd->error_count++;
+				dwc_otg_hcd_save_data_toggle(hc, hc_regs, qtd);
+				update_urb_state_xfer_intr(hc, hc_regs,
+					   qtd->urb, qtd, DWC_OTG_HC_XFER_XACT_ERR);
+				halt_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_XACT_ERR);
 			}
 
 		}
 	} else {
 		DWC_PRINTF("NYET/NAK/ACK/other in non-error case, 0x%08x\n",
 			   hcint.d32);
+		/* Failthrough: use 3-strikes rule */
+		qtd->error_count++;
+		dwc_otg_hcd_save_data_toggle(hc, hc_regs, qtd);
+		update_urb_state_xfer_intr(hc, hc_regs,
+			   qtd->urb, qtd, DWC_OTG_HC_XFER_XACT_ERR);
+		halt_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_XACT_ERR);
 	}
 }
 
-- 
1.9.1