Re: [PATCH v4 00/10] PCI: Enable Power and configure the TC956x PCIe switch

Manivannan Sadhasivam
2025-02-27T03:59:33Z

On Thu, Feb 27, 2025 at 09:27:47AM +0530, Manivannan Sadhasivam wrote:
> On Tue, Feb 25, 2025 at 03:03:57PM +0530, Krishna Chaitanya Chundru wrote:
> > TC956x 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.
> >
> > TC956x 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 TC956x 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.
> >
> > Enable global IRQ for PCIe controller so that recan can happen when
> > link was up through global IRQ.
> >
>
> Move these patches to a separate series.
>

Or you can just drop them. I have a series that adds global IRQ to most of the
SoCs and sc7280 is one of them.

- Mani

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