linux-kernel - Re: [PATCH v5 0/9] PCI: Enable Power and configure the TC9563 PCIe switch

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Message-ID: <ps5ck23ubpo2vdxzko6yixujlf7mqppdssqrc5bz3vbupmn6cu@yc2ld2tb3r2b>
Date: Tue, 1 Jul 2025 10:11:06 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Cc: 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>,
        chaitanya chundru <quic_krichai@...cinc.com>,
        Bjorn Andersson <andersson@...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@...cnic.com,
        amitk@...nel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, jorge.ramirez@....qualcomm.com,
        Dmitry Baryshkov <lumag@...nel.org>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v5 0/9] PCI: Enable Power and configure the TC9563 PCIe
 switch

On Sat, Apr 12, 2025 at 07:19:49AM +0530, Krishna Chaitanya Chundru wrote:
> TC9563 is the PCIe switch which has one upstream and three downstream
> ports. To one of the downstream ports ethernet MAC is connected as endpoint
> device. Other two downstream ports are supposed to connect to external
> device. One Host can connect to TC956x by upstream port.
> 
> TC9563 switch power is controlled by the GPIO's. After powering on
> the switch will immediately participate in the link training. if the
> host is also ready by that time PCIe link will established. 
> 
> The TC9563 needs to configured certain parameters like de-emphasis,
> disable unused port etc before link is established.
> 
> As the controller starts link training before the probe of pwrctl driver,
> the PCIe link may come up as soon as we power on the switch. Due to this
> configuring the switch itself through i2c will not have any effect as
> this configuration needs to done before link training. To avoid this
> introduce two functions in pci_ops to start_link() & stop_link() which
> will disable the link training if the PCIe link is not up yet.
> 
> This series depends on the https://lore.kernel.org/all/20250124101038.3871768-3-krishna.chundru@oss.qualcomm.com/
> 
> Note: The QPS615 PCIe switch is rebranded version of Toshiba switch TC9563 series.
> There is no difference between both the switches, both has two open downstream ports
> and one embedded downstream port to which Ethernet MAC is connected. As QPS615 is the
> rebranded version of Toshiba switch rename qps615 with tc956x so that this driver
> can be leveraged by all who are using Toshiba switch.
> 
> Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>

Krishna, the series no longer applies to linux-next. There were comments
which required another respin. When can we expect a next revision?

-- 
With best wishes
Dmitry