linux-kernel - Re: [PATCH v5 0/2] PCI: imx6: Add a method to handle CLKREQ# override

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Message-Id: <175881990427.392988.6937520327985325506.b4-ty@kernel.org>
Date: Thu, 25 Sep 2025 22:35:04 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: frank.li@....com, jingoohan1@...il.com, l.stach@...gutronix.de, 
 lpieralisi@...nel.org, kwilczynski@...nel.org, robh@...nel.org, 
 bhelgaas@...gle.com, shawnguo@...nel.org, s.hauer@...gutronix.de, 
 kernel@...gutronix.de, festevam@...il.com, 
 Richard Zhu <hongxing.zhu@....com>
Cc: linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 imx@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 0/2] PCI: imx6: Add a method to handle CLKREQ#
 override


On Tue, 23 Sep 2025 15:39:11 +0800, Richard Zhu wrote:
> The CLKREQ# is an open drain, active low signal that is driven low by
> the card to request reference clock. It's an optional signal added in
> PCIe CEM r4.0, sec 2. Thus, this signal wouldn't be driven low if it's
> reserved.
> 
> 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 the scenario described above), force
> CLKREQ# override active low for i.MX PCIe host during initialization.
> 
> [...]

Applied, thanks!

[1/2] PCI: dwc: Invoke post_init in dw_pcie_resume_noirq()
      commit: 27afd094ea4be542594058d685c7af4654ab8de7
[2/2] PCI: imx6: Add a method to handle CLKREQ# override active low
      commit: dc853fb85d6b90e0805660c1dbb38ef7641af839

Best regards,
-- 
Manivannan Sadhasivam <mani@...nel.org>