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| author | Roger Quadros <rogerq@ti.com> | 2017-10-31 14:11:55 +0100 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2017-12-11 11:36:53 +0100 |
| commit | 42bf02ec6e420e541af9a47437d0bdf961ca2972 (patch) | |
| tree | d26f219a5d67aad75da1ec0db2e7a71fe0164352 /drivers/usb/phy | |
| parent | USB: dummy-hcd: Adapt dummy_udc_set_speed() (diff) | |
| download | linux-42bf02ec6e420e541af9a47437d0bdf961ca2972.tar.xz linux-42bf02ec6e420e541af9a47437d0bdf961ca2972.zip | |
usb: dwc3: Allow disabling of metastability workaround
Some platforms (e.g. TI's DRA7 USB2 instance) have more trouble
with the metastability workaround as it supports only
a High-Speed PHY and the PHY can enter into an Erratic state [1]
when the controller is set in SuperSpeed mode as part of
the metastability workaround.
This causes upto 2 seconds delay in enumeration on DRA7's USB2
instance in gadget mode.
If these platforms can be better off without the workaround,
provide a device tree property to suggest that so the workaround
is avoided.
[1] Device mode enumeration trace showing PHY Erratic Error.
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>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/phy')
0 files changed, 0 insertions, 0 deletions