linux-kernel - Re: [PATCH] PCI: qcom-ep: Do not enable resources during probe()

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Message-ID: <20240813202547.GC1922056@rocinante>
Date: Wed, 14 Aug 2024 05:25:47 +0900
From: Krzysztof Wilczyński <kw@...ux.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: lpieralisi@...nel.org, robh@...nel.org, bhelgaas@...gle.com,
	linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: qcom-ep: Do not enable resources during probe()

Hello,

> Starting from commit 869bc5253406 ("PCI: dwc: ep: Fix DBI access failure
> for drivers requiring refclk from host"), all the hardware register access
> (like DBI) were moved to dw_pcie_ep_init_registers() which gets called only
> in qcom_pcie_perst_deassert() i.e., only after the endpoint received refclk
> from host.
> 
> So there is no need to enable the endpoint resources (like clk, regulators,
> PHY) during probe(). Hence, remove the call to qcom_pcie_enable_resources()
> helper from probe(). This was added earlier because dw_pcie_ep_init() was
> doing DBI access, which is not done now.
> 
> While at it, let's also call dw_pcie_ep_deinit() in err path to deinit the
> EP controller in the case of failure.

Applied to controller/qcom, thank you!

[1/1] PCI: qcom-ep: Do not enable resources during probe()
      https://git.kernel.org/pci/pci/c/cd0b3e13ec30

	Krzysztof