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This is a preparation before adding the Max-Link-width capability setup which would in its turn complete the max-link-width setup procedure defined by Synopsys in the HW-manual. Seeing there is a max-link-speed setup method defined in the DW PCIe core driver it would be good to have a similar function for the link width setup. That's why we need to define a dedicated function first from already implemented but incomplete link-width setting up code. Link: https://lore.kernel.org/linux-pci/20231018085631.1121289-3-yoshihiro.shimoda.uh@renesas.com Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> Reviewed-by: Manivannan Sadhasivam <mani@kernel.org> Reviewed-by: Serge Semin <fancer.lancer@gmail.com>