linux-kernel - Re: [PATCH v2 1/3] PCI: qcom: reshuffle reset logic in 2_7

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Message-ID: <20240212211432.GA1145620@bhelgaas>
Date: Mon, 12 Feb 2024 15:14:32 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Johan Hovold <johan+linaro@...nel.org>
Subject: Re: [PATCH v2 1/3] PCI: qcom: reshuffle reset logic in 2_7_0 .init

Would be nice to have a hint in the subject line about what this does.
Also capitalize to match the others ("PCI: qcom: <Capitalized verb>").

On Sat, Feb 10, 2024 at 06:10:05PM +0100, Konrad Dybcio wrote:
> At least on SC8280XP, if the PCIe reset is asserted, the corresponding
> AUX_CLK will be stuck at 'off'. This has not been an issue so far,
> since the reset is both left de-asserted by the previous boot stages
> and the driver only toggles it briefly in .init.
> 
> As part of the upcoming suspend prodecure however, the reset will be
> held asserted.

s/prodecure/procedure/

> Assert the reset (which may end up being a NOP in some cases) and
> de-assert it back *before* turning on the clocks in preparation for
> introducing RC powerdown and reinitialization.

Bjorn