diff options
| author | Roger Quadros <rogerq@ti.com> | 2017-10-31 15:26:00 +0200 |
|---|---|---|
| committer | Tony Lindgren <tony@atomide.com> | 2017-12-11 08:46:53 -0800 |
| commit | b8c9c6fa2002b8fd4a9710f76f80f99c6046d48c (patch) | |
| tree | e11a2b779830ebc31ce0f4b1bbd004b447c07a9c /arch/arm | |
| parent | 5f9ca11f25fd9f5577f2080f1d70fc857a13bb1d (diff) | |
| download | linux-rt-b8c9c6fa2002b8fd4a9710f76f80f99c6046d48c.tar.gz | |
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 <rogerq@ti.com>
Acked-by: Felipe Balbi <felipe.balbi@linux/intel.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/boot/dts/dra7.dtsi | 1 |
1 files changed, 1 insertions, 0 deletions
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 @@ dr_mode = "otg"; snps,dis_u3_susphy_quirk; snps,dis_u2_susphy_quirk; + snps,dis_metastability_quirk; }; }; |