iMX6DL : How to reset the PCIe core ?

[koichisakagami]

Dear community,
I use i.MX6DL PCIe module as a RootComplex.

After bringing up the PCIe link connected to an endpoint device,
I want to reset the PCIe core in order to re-bringing up .

I hope to use the "core_rst_n" signal to reset the PCIe core.
It is described in Figure 49-9. I/O Interfaces involved in Initialization (IMX6SDLRM)

[Question]
What kind of registers do I need to set up in order to assert  "core_rst_n" signal ?

Best Regards,
       Koichi Sakagami

[Yuri · Accepted solution]

Hello,

  The "core_rst_n" is internal signal, that may be activated by i.MX6 System Reset Controller (SoC resets).

You may look at Chapter 60 [System Reset Controller (SRC)] of the i.MX6 S/DL RM for more details.

As we can see, there is no separate reset option for the PCIe.

  For PCIe Link establishment You may use bit APP_LTSSM_ENABLE and APP_INIT_RST bits

of IOMUXC_GPR12 register.

Have a great day,
Yuri

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