On Wed, Sep 17, 2025 at 05:37:49PM +0800, Richard Zhu wrote:

The CLKREQ# is an open drain, active low signal that is driven low by
the card to request reference clock.

But the CLKREQ# maybe reserved on some old device, compliant with CEM
r3.0 or before. Thus, this signal wouldn't be driven low by these old
devices.

Since the reference clock controlled by CLKREQ# may be required by i.MX
PCIe host too. To make sure this clock is ready even when the CLKREQ#
isn't driven low by the card(e.x old cards described above), force
CLKREQ# override active low for i.MX PCIe host during initialization.

The CLKREQ# override can be cleared safely when supports-clkreq is
present and PCIe link is up later. Because the CLKREQ# would be driven
low by the card in this case.

Main changes in v2:
- Update the commit message, and collect the reviewed-by tag.

[PATCH v2 1/2] PCI: dwc: Invoke post_init in dw_pcie_resume_noirq()
[PATCH v2 2/2] PCI: imx6: Add a method to handle CLKREQ# override

Patch 2 is not applying on top of 6.17-rc1. Please fix it and resend the series
(along with the CEM 4.0 citation suggested by Bjorn).

- Mani

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