linux-kernel - [RFC] usb: dwc2: hcd: fix split schedule issue

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Date:	Fri,  6 Nov 2015 17:36:52 +0800
From:	Yunzhi Li <lyz@...k-chips.com>
To:	John.Youn@...opsys.com, dianders@...omium.org, jwerner@...gle.com,
	dinguyen@...nsource.altera.com, yousaf.kaukab@...el.com,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	wulf@...k-chips.com, kever.yang@...k-chips.com,
	caesar.wang@...k-chips.com, huangtao@...k-chips.com
Cc:	rockchip-discuss@...omium.org, Yunzhi Li <lyz@...k-chips.com>
Subject: [RFC] usb: dwc2: hcd: fix split schedule issue

Fix dwc2 split schedule sequence issue. Not schedule a SSPLIT_IN
packet between SSPLIT-begin and SSPLIT-end.

Signed-off-by: Yunzhi Li <lyz@...k-chips.com>
---
 drivers/usb/dwc2/hcd.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index e79baf7..a32ed01 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -1122,6 +1122,10 @@ static void dwc2_process_periodic_channels(struct dwc2_hsotg *hsotg)
 			break;
 		}
 
+		if (qh->channel->xact_pos == DWC2_HCSPLT_XACTPOS_BEGIN ||
+		    qh->channel->xact_pos == DWC2_HCSPLT_XACTPOS_MID)
+			break;
+
 		/*
 		 * In Slave mode, stay on the current transfer until there is
 		 * nothing more to do or the high-bandwidth request count is
-- 
2.0.0


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