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TC9563 is a PCIe switch that has one upstream and three downstream ports. One of the downstream ports is connected to an integrated ethernet MAC endpoint. The other two downstream ports are available to connect to external devices. One Host can connect to TC9563 by upstream port. The TC9563 switch needs to be configured after powering on and before the PCIe link is up. The PCIe controller driver already enables link training at the host side even before this driver probe happens. Due to this, when driver enables power to the switch, it participates in link training and the PCIe link may come up before configuring the switch through I2C. Once the link is up the configuration done through I2C will not have any effect. To prevent the host from participating in link training, disable link training on the host side to ensure the link does not come up before the switch is configured via I2C. Based on DT property and type of the port, TC9563 is configured through I2C. Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com> [bhelgaas: squash fixes from https://lore.kernel.org/r/20251120065116.13647-2-mani@kernel.org https://lore.kernel.org/r/20251120065116.13647-3-mani@kernel.org] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Bjorn Andersson <andersson@kernel.org> Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Reviewed-by: Manivannan Sadhasivam <mani@kernel.org> Link: https://patch.msgid.link/20251101-tc9563-v9-6-de3429f7787a@oss.qualcomm.com |
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| .. | ||
| Kconfig | ||
| Makefile | ||
| core.c | ||
| pci-pwrctrl-pwrseq.c | ||
| pci-pwrctrl-tc9563.c | ||
| slot.c | ||