linux-kernel - Re: [PATCH v3 5/6] PCI: qcom: Add support for host_stop_link() & host_start

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Message-ID: <20241112233609.GA1868317@bhelgaas>
Date: Tue, 12 Nov 2024 17:36:09 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Krishna chaitanya chundru <quic_krichai@...cinc.com>
Cc: andersson@...nel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	cros-qcom-dts-watchers@...omium.org,
	Jingoo Han <jingoohan1@...il.com>,
	Bartosz Golaszewski <brgl@...ev.pl>, quic_vbadigan@...cinc.com,
	linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/6] PCI: qcom: Add support for host_stop_link() &
 host_start_link()

On Tue, Nov 12, 2024 at 08:31:37PM +0530, Krishna chaitanya chundru wrote:
> For the switches like QPS615 which needs to configure it before
> the PCIe link is established.
> 
> If the link is up, the boatloader might powered and configured the
> endpoint/switch already. In that case don't touch PCIe link else
> assert the PERST# and disable LTSSM bit so that PCIe controller
> will not participate in the link training as part of host_stop_link().

s/boatloader/bootloader/
s/might powered/might have powered/ ?

> De-assert the PERST# and enable LTSSM bit back in host_start_link().
> 
> Introduce ltssm_disable function op to stop the link training.