CRITICALITY

Medium

DESCRIPTION

When suspend mode is enabled (USB_GUSB3PIPECTL[17]SUSPENDENABLE =0x1), the communication between the host controller and the USB device is broken. This happens in the following two sequences:

Sequence 1:

• Enable and configure the DWC_USB3 controller as host
• Set the USB_GUSB3PIPECTL[17]SUSPENDENABLE = 0x1 and USB_GUSB2PHYCFG[6]SUSPHY = 0x1
• Connect a USB3.0 device

When USB3.0 device is connected there is not enough time to establish the USB3.0 link so the host controller falls back to USB2.0 mode.

Sequence 2:

• Enable and configure the DWC_USB3 controller as host
• Wait until the USB3.0 link is established
• Set the USB_GUSB3PIPECTL [17]SUSPENDENABLE = 0x1 and USB_GUSB2PHYCFG [6]SUSPHY = 0x1
• Host controller initiates a transition to U3.
• Wait until transition U3 is completed successfully
• Host controller initiates a transition to U0.

The USB3.0 link cannot be reestablished and the host controller falls back to USB2.0.

WORKAROUND

First set CTRL_CORE_PHY_POWER_USB[21:14]USB_PWRCTL_CLK_CMD to 0x43 then to 0x03 just after U3_EXIT state (setting the PORTSC2 in U0 by Polling on USB_PORTSC2 [8:5]PLS=RESUME) and before Recovery state.

REVISIONS IMPACTED

AM574x SR 1.0
AM576x SR 1.0

AM574x: 1.0

DRA75xP, DRA74xP, DRA77xP, DRA76xP: 1.0

TDA2Px: 1.0

AM576x: 1.0