From b8c9c6fa2002b8fd4a9710f76f80f99c6046d48c Mon Sep 17 00:00:00 2001 From: Roger Quadros Date: Tue, 31 Oct 2017 15:26:00 +0200 Subject: [PATCH] ARM: dts: dra7: Disable USB metastability workaround for USB2 The metastability workaround causes Erratic errors [1] on the HighSpeed USB PHY which can cause upto 2 seconds delay in enumerating to a USB host while in Gadget mode. Disable the Run/Stop metastability workaround to avoid this ill effect. We are aware that this opens up the opportunity for Run/Stop metastability, however this issue has never been observed in TI releases so we think that Run/Stop metastability is a lesser evil than the PHY Erratic errors. So disable it. [1] USB controller trace during gadget enumeration irq/90-dwc3-969 [000] d... 52.323145: dwc3_event: event (00000901): Erratic Error [U0] irq/90-dwc3-969 [000] d... 52.560646: dwc3_event: event (00000901): Erratic Error [U0] irq/90-dwc3-969 [000] d... 52.798144: dwc3_event: event (00000901): Erratic Error [U0] Signed-off-by: Roger Quadros Acked-by: Felipe Balbi Signed-off-by: Tony Lindgren --- arch/arm/boot/dts/dra7.dtsi | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi index ac9216293b7c..947ce588a35b 100644 --- a/arch/arm/boot/dts/dra7.dtsi +++ b/arch/arm/boot/dts/dra7.dtsi @@ -1547,6 +1547,7 @@ usb1: usb@48890000 { dr_mode = "otg"; snps,dis_u3_susphy_quirk; snps,dis_u2_susphy_quirk; + snps,dis_metastability_quirk; }; };