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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Chunfeng Yun <chunfeng.yun@mediatek.com>,
        Mathias Nyman <mathias.nyman@linux.intel.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.14 235/239] usb: xhci-mtk: fix ISOC error when interval is zero
Date:   Tue, 19 Nov 2019 06:20:35 +0100
Message-Id: <20191119051342.579810327@linuxfoundation.org>
In-Reply-To: <20191119051255.850204959@linuxfoundation.org>
References: <20191119051255.850204959@linuxfoundation.org>
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From: Chunfeng Yun <chunfeng.yun@mediatek.com>

[ Upstream commit 87173acc0d8f0987bda8827da35fff67f52ad15d ]

If the interval equal zero, needn't round up to power of two
for the number of packets in each ESIT, so fix it.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/usb/host/xhci-mtk-sch.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
index 6e7ddf6cafae1..defaf950e6314 100644
--- a/drivers/usb/host/xhci-mtk-sch.c
+++ b/drivers/usb/host/xhci-mtk-sch.c
@@ -122,7 +122,9 @@ static void setup_sch_info(struct usb_device *udev,
 		}
 
 		if (ep_type == ISOC_IN_EP || ep_type == ISOC_OUT_EP) {
-			if (esit_pkts <= sch_ep->esit)
+			if (sch_ep->esit == 1)
+				sch_ep->pkts = esit_pkts;
+			else if (esit_pkts <= sch_ep->esit)
 				sch_ep->pkts = 1;
 			else
 				sch_ep->pkts = roundup_pow_of_two(esit_pkts)
-- 
2.20.1