linux-kernel - Re: [PATCH 3/4] PCI: cadence-ep: Introduce cdns_pcie_ep

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Message-ID: <Z-vN8_-HJ0K1-1mH@ryzen>
Date: Tue, 1 Apr 2025 13:28:51 +0200
From: Niklas Cassel <cassel@...nel.org>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: Siddharth Vadapalli <s-vadapalli@...com>, lpieralisi@...nel.org,
	kw@...ux.com, robh@...nel.org, bhelgaas@...gle.com, vigneshr@...com,
	kishon@...nel.org, wojciech.jasko-EXT@...tinental-corporation.com,
	thomas.richard@...tlin.com, bwawrzyn@...co.com,
	linux-pci@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	srk@...com, dlemoal@...nel.org
Subject: Re: [PATCH 3/4] PCI: cadence-ep: Introduce cdns_pcie_ep_disable
 helper for cleanup

Hello Mani,

On Wed, Mar 19, 2025 at 04:02:17PM +0530, Manivannan Sadhasivam wrote:
> > 
> > While I don't intend to justify dropping pci_epc_deinit_notify() in the
> > cleanup path, I wanted to check if this should be added to
> > dw_pcie_ep_deinit() as well. Or is it the case that dw_pcie_ep_deinit()
> > is different from cdns_pcie_ep_disable()? Please let me know.
> > 
> 
> Reason why it was not added to dw_pcie_ep_deinit() because, deinit_notify() is
> supposed to be called while performing the resource cleanup with active refclk.
> 
> Some plaforms (Tegra, Qcom) depend on refclk from host. So if deinit_notify() is
> called when there is no refclk, it will crash the endpoint SoC. But since
> cadence endpoint platforms seem to generate their own refclk, you can call
> deinit_notify() during deinit phase.
> 
> That said, I noticed some issues in the DWC cleanup path while checking the code
> now. Will submit fixes for them.

Could you please elaborate quickly what issues you found?


Kind regards,
Niklas