Linux/TUSB7320: TUSB7320 WAKE# pin always in high state

The TUSB7340 would have to be configured before it would drive a wake event.  Can you confirm the timing of the resets and why there are pulldowns on the clocks?  

Regards,

JMMN

Hi JMMN,

Thanks for your response.

The GRST pin is set high and OSC_CLK is enabled as soon as power to the PCIE block ON. As per code, the PRST signal is set HIGH, approximately 1.2ms after PCIE_CLK is enabled. Following figure displays the power up sequence order of important signals.

Regarding the pull down on clock lines, It is done to satisfy the design recommendation of the processor used in our board. Do you find any discrepancy in our configuration and design. Kindly help us to rectify the issues.

Thanks,

Koil Arul Raj.S

Hi,

Any updates on this.

Thanks,

Koil Arul Raj.S

The clocks look valid, can you confirm the GRST timing meets the requirements listed in Section 9.1.1 of the datasheet?

Regards,

JMMN

Hi JMMN,

To meet the GRST# timings exactly as mentioned in the datasheet, we changed the hardware enable of GRST# to software enable using a GPIO.

After modifying GRST#, we obtained the following power sequence timing diagram.

Now all the signals are satisfying the timing requirement mentioned in the datasheet. But still the chip not enabling WAKE# signal. We are struggling to find the reason for the failure. What do you think?

Thanks,

Koil Arul Raj.S

Hi,

Any updates on this issue.

Thanks,

Koil Arul Raj.S

Hi JMMN,

Now we could able to enumerate PCI usb card with few hardware reworks. The lspci command gives us the following output.

# lspci
00:00.0 PCI bridge: Synopsys, Inc. Device abcd (rev 01)
01:00.0 USB controller: Texas Instruments TUSB73x0 SuperSpeed USB 3.0 xHCI Host Controller (rev 02)

But the xHCI host controller drivers are not properly loaded. The debug messages while booting are given as follows,

[    1.888273] xhci_hcd 0000:01:00.0: enabling bus mastering
[    1.888291] xhci_hcd 0000:01:00.0: xHCI Host Controller
[    1.892282] xhci_hcd 0000:01:00.0: new USB bus registered, assigned bus number 1
[    1.929749] xhci_hcd 0000:01:00.0: Host not halted after 16000 microseconds.
[    1.935504] xhci_hcd 0000:01:00.0: can't setup: -19
[    1.939090] xhci_hcd 0000:01:00.0: USB bus 1 deregistered
[    1.943262] xhci_hcd 0000:01:00.0: init 0000:01:00.0 fail, -19

On debugging we found that, in xhci_handshake() function present in xhci.c file throws error ENODEV(-19).

I have enabled following options in the kernel,
CONFIG_USB_XHCI_HCD=y
CONFIG_USB_XHCI_PCI=y
CONFIG_USB_XHCI_PLATFORM=y

What is the reason for the above error? How to resolve this issue?

Anticipating your response as soon as possible.

Thanks,

Koil Arul Raj.S