linux-kernel - [PATCH 2/3] usb: xhci-mtk: fix UAS issue by XHCI_BROKEN

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Message-ID: <20201216115125.5886-2-chunfeng.yun@mediatek.com>
Date:   Wed, 16 Dec 2020 19:51:24 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Mathias Nyman <mathias.nyman@...el.com>
CC:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <linux-usb@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Hsin-Yi Wang <hsinyi@...omium.org>,
        Ikjoon Jang <ikjn@...omium.org>
Subject: [PATCH 2/3] usb: xhci-mtk: fix UAS issue by XHCI_BROKEN_STREAMS quirk

The 0.96 xHCI controller on some platforms does not support
bulk stream even HCCPARAMS says supporting, due to MaxPSASize
is set a non-zero default value by mistake, here use
XHCI_BROKEN_STREAMS quirk to fix it.

Fixes: 94a631d91ad3 ("usb: xhci-mtk: check hcc_params after adding primary hcd")
Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
 drivers/usb/host/xhci-mtk.c | 7 ++++++-
 drivers/usb/host/xhci-mtk.h | 1 +
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
index 8f321f39ab96..08dab974d847 100644
--- a/drivers/usb/host/xhci-mtk.c
+++ b/drivers/usb/host/xhci-mtk.c
@@ -395,6 +395,9 @@ static void xhci_mtk_quirks(struct device *dev, struct xhci_hcd *xhci)
 	xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
 	if (mtk->lpm_support)
 		xhci->quirks |= XHCI_LPM_SUPPORT;
+
+	if (mtk->broken_streams)
+		xhci->quirks |= XHCI_BROKEN_STREAMS;
 }
 
 /* called during probe() after chip reset completes */
@@ -460,6 +463,8 @@ static int xhci_mtk_probe(struct platform_device *pdev)
 		return ret;
 
 	mtk->lpm_support = of_property_read_bool(node, "usb3-lpm-capable");
+	mtk->broken_streams =
+		of_property_read_bool(node, "mediatek,broken_streams_quirk");
 	/* optional property, ignore the error if it does not exist */
 	of_property_read_u32(node, "mediatek,u3p-dis-msk",
 			     &mtk->u3p_dis_msk);
@@ -546,7 +551,7 @@ static int xhci_mtk_probe(struct platform_device *pdev)
 	if (ret)
 		goto put_usb3_hcd;
 
-	if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
+	if (!mtk->broken_streams && HCC_MAX_PSA(xhci->hcc_params) >= 4)
 		xhci->shared_hcd->can_do_streams = 1;
 
 	ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
diff --git a/drivers/usb/host/xhci-mtk.h b/drivers/usb/host/xhci-mtk.h
index a93cfe817904..86aa4978915e 100644
--- a/drivers/usb/host/xhci-mtk.h
+++ b/drivers/usb/host/xhci-mtk.h
@@ -147,6 +147,7 @@ struct xhci_hcd_mtk {
 	struct phy **phys;
 	int num_phys;
 	bool lpm_support;
+	bool broken_streams;
 	/* usb remote wakeup */
 	bool uwk_en;
 	struct regmap *uwk;
-- 
2.18.0