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

Bjorn Helgaas
2025-10-29T23:23:33Z

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 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