PCI: dwc: Fix n_fts[] array overrun

commit aeaa0bfe ("PCI: dwc: Move N_FTS setup to common setup")
incorrectly uses pci->link_gen in deriving the index to the
n_fts[] array also introducing the issue of accessing beyond the
boundaries of array for greater than Gen-2 speeds. This change fixes
that issue.

Link: https://lore.kernel.org/r/20220926111923.22487-1-vidyas@nvidia.com
Fixes: aeaa0bfe ("PCI: dwc: Move N_FTS setup to common setup")
Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Jingoo Han <jingoohan1@gmail.com>

drivers/pci/controller/dwc/pcie-designware.c

@@ -641,7 +641,7 @@ void dw_pcie_setup(struct dw_pcie *pci)
 	if (pci->n_fts[1]) {
 		val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
 		val &= ~PORT_LOGIC_N_FTS_MASK;
-		val |= pci->n_fts[pci->link_gen - 1];
+		val |= pci->n_fts[1];
 		dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
 	}