linux-kernel - Re: [PATCH v7 0/8] PCI: Enable Power and configure the TC9563 PCIe switch

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Message-ID: <ocmd7hcplxd66xsy7brg66v5htagv5x34hcmq5seirnjobvkbv@3i6niot5sufo>
Date: Thu, 30 Oct 2025 02:07:49 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.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>,
        Krzysztof Wilczyński <kwilczynski@...nel.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, 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,
        linux-arm-kernel@...ts.infradead.org,
        Dmitry Baryshkov <lumag@...nel.org>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v7 0/8] PCI: Enable Power and configure the TC9563 PCIe
 switch

On Wed, Oct 29, 2025 at 06:23:23PM -0500, Bjorn Helgaas wrote:
> On Wed, Oct 29, 2025 at 04:59:53PM +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/
> 
> What does this series apply to?  It doesn't apply cleanly to v6.18-rc1
> (the normal base for topic branches) or v6.18-rc3 or pci/next.

Juding by the base-commit in the cover letter, it is the following tree:

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=e53642b87a4f4b03a8d7e5f8507fc3cd0c595ea6

Merge tag 'v6.18-rc3-smb-server-fixes' of git://git.samba.org/ksmbd

Not that I have an idea, _why_ that tree was used, was it really used or
why there are no dependencies mentioned in the footer of the cover
letter.

> 
> I tried first applying the patches from
> https://lore.kernel.org/all/20250124101038.3871768-3-krishna.chundru@oss.qualcomm.com/,
> but those don't apply to -rc1 or -rc3 either.
> 
> Bjorn

-- 
With best wishes
Dmitry