From: Sevak Arakelyan <sevaka@synopsys.com>
Date: Wed, 16 Nov 2016 23:33:52 +0000 (-0800)
Subject: usb: dwc2: Stop Complete Splits after Data PID == 0
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9d8da85798cb45c803e449284c4564d572756428;p=linux-beck.git

usb: dwc2: Stop Complete Splits after Data PID == 0

Stop sending complete split requests in case of ISOC IN split transfers
after getting data with PID0. Otherwise we will get a NYET for each
additional IN token.

Signed-off-by: Sevak Arakelyan <sevaka@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
---

diff --git a/drivers/usb/dwc2/hcd_intr.c b/drivers/usb/dwc2/hcd_intr.c
index 0f2633434b89..b8f4b6aaf1d0 100644
--- a/drivers/usb/dwc2/hcd_intr.c
+++ b/drivers/usb/dwc2/hcd_intr.c
@@ -915,6 +915,8 @@ static int dwc2_xfercomp_isoc_split_in(struct dwc2_hsotg *hsotg,
 {
 	struct dwc2_hcd_iso_packet_desc *frame_desc;
 	u32 len;
+	u32 hctsiz;
+	u32 pid;
 
 	if (!qtd->urb)
 		return 0;
@@ -932,7 +934,10 @@ static int dwc2_xfercomp_isoc_split_in(struct dwc2_hsotg *hsotg,
 
 	qtd->isoc_split_offset += len;
 
-	if (frame_desc->actual_length >= frame_desc->length) {
+	hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chnum));
+	pid = (hctsiz & TSIZ_SC_MC_PID_MASK) >> TSIZ_SC_MC_PID_SHIFT;
+
+	if (frame_desc->actual_length >= frame_desc->length || pid == 0) {
 		frame_desc->status = 0;
 		qtd->isoc_frame_index++;
 		qtd->complete_split = 0;