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. > This series depends on the https://lore.kernel.org/all/20250124101038.3871768-3-krishna.chundru@xxxxxxxxxxxxxxxx/ > > Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@xxxxxxxxxxxxxxxx> > --- > changes in v3: > - The QPS615 PCIe switch is rebranded version of Toshiba switch TC956x. > 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. This should be moved to the description as a NOTE. - Mani -- மணிவண்ணன் சதாசிவம்
