From 4a2f152af1c478d42bd4f535788d4dbec015704f Mon Sep 17 00:00:00 2001 From: Stanley Chang Date: Wed, 19 Apr 2023 10:00:43 +0800 Subject: [PATCH] dt-bindings: usb: snps,dwc3: Add 'snps,parkmode-disable-hs-quirk' quirk Add a new 'snps,parkmode-disable-hs-quirk' DT quirk to dwc3 core for disable the high-speed parkmode. For some USB wifi devices, if enable this feature it will reduce the performance. Therefore, add an option for disabling HS park mode by device-tree. In Synopsys's dwc3 data book: In a few high speed devices when an IN request is sent within 900ns of the ACK of the previous packet, these devices send a NAK. When connected to these devices, if required, the software can disable the park mode if you see performance drop in your system. When park mode is disabled, pipelining of multiple packet is disabled and instead one packet at a time is requested by the scheduler. This allows up to 12 NAKs in a micro-frame and improves performance of these slow devices. Acked-by: Rob Herring Signed-off-by: Stanley Chang Link: https://lore.kernel.org/r/20230419020044.15475-2-stanley_chang@realtek.com Signed-off-by: Greg Kroah-Hartman --- Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml index eb58ba96b8503..50edc4da780e9 100644 --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml @@ -236,6 +236,11 @@ properties: When set, all SuperSpeed bus instances in park mode are disabled. type: boolean + snps,parkmode-disable-hs-quirk: + description: + When set, all HighSpeed bus instances in park mode are disabled. + type: boolean + snps,dis_metastability_quirk: description: When set, disable metastability workaround. CAUTION! Use only if you are -- 2.30.2