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Message-ID: <20231227060316.8539-1-chunfeng.yun@mediatek.com> Date: Wed, 27 Dec 2023 14:03:14 +0800 From: Chunfeng Yun <chunfeng.yun@...iatek.com> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com> CC: Chunfeng Yun <chunfeng.yun@...iatek.com>, Conor Dooley <conor+dt@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>, "Mathias Nyman" <mathias.nyman@...el.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>, Eddie Hung <eddie.hung@...iatek.com>, Macpaul Lin <macpaul.lin@...iatek.com> Subject: [PATCH v4 1/3] dt-bindings: usb: mtk-xhci: add a property for Gen1 isoc-in transfer issue For Gen1 isoc-in endpoint on controller before about SSUSB IPM v1.6.0, it still send out unexpected ACK after receiving a short packet in burst transfer, this will cause an exception on connected device, specially for a 4k camera. Add a quirk property "rx-fifo-depth" to work around this hardware issue, prefer to use 3k bytes; The side-effect is that may cause performance drop about 10%, including bulk transfer. Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com> --- v4: change rx-fifo size in bytes v3: add fifo depth unit, change the value range from 0-3 to 1-4 v2: change 'mediatek,rxfifo-depth' to 'rx-fifo-depth' --- .../devicetree/bindings/usb/mediatek,mtk-xhci.yaml | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml index e9644e333d78..9f621f2209df 100644 --- a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml +++ b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml @@ -124,6 +124,17 @@ properties: defined in the xHCI spec on MTK's controller. default: 5000 + rx-fifo-depth: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + It is a quirk used to work around Gen1 isoc-in endpoint transfer issue + that still send out unexpected ACK after device finish the burst transfer + with a short packet and cause an exception, specially on a 4K camera + device, it happens on controller before about IPM v1.6.0; the side-effect + is that may cause performance drop about 10%, include bulk transfer, + prefer to use 3k here. The size is in bytes. + enum: [1024, 2048, 3072, 4096] + # the following properties are only used for case 1 wakeup-source: description: enable USB remote wakeup, see power/wakeup-source.txt -- 2.18.0
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