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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <3dccca2d-272f-451a-9e38-901a6fa3a24c@oss.qualcomm.com>
Date: Thu, 30 Oct 2025 09:13:29 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: 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>, 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>,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v7 0/8] PCI: Enable Power and configure the TC9563 PCIe
 switch


On 10/30/2025 4:53 AM, 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.
I sent this on top of rc3 as we have some dependencies with latest 
changes i.e ecam changes in dwc driver.
> 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.

This needs to be applied on the dts schema in github, it is already 
applied I will remove this reference in next
series.

- Krishna Chaitanya.

>
> Bjorn