PCI: brcmstb: Set generation limit before PCIe link up

When the user elects to limit the PCIe generation via the appropriate
devicetree property, apply the settings before the PCIe link up, not
after.

Fixes: c045213 ("PCI: brcmstb: Add Broadcom STB PCIe host controller driver")
Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20250214173944.47506-2-james.quinlan@broadcom.com
[kwilczynski: commit log]
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>

Author: jamesequinlan

drivers/pci/controller/pcie-brcmstb.c

@@ -1324,6 +1324,10 @@ static int brcm_pcie_start_link(struct brcm_pcie *pcie)
 	bool ssc_good = false;
 	int ret, i;
 
+	/* Limit the generation if specified */
+	if (pcie->gen)
+		brcm_pcie_set_gen(pcie, pcie->gen);
+
 	/* Unassert the fundamental reset */
 	ret = pcie->cfg->perst_set(pcie, 0);
 	if (ret)
@@ -1350,9 +1354,6 @@ static int brcm_pcie_start_link(struct brcm_pcie *pcie)
 
 	brcm_config_clkreq(pcie);
 
-	if (pcie->gen)
-		brcm_pcie_set_gen(pcie, pcie->gen);
-
 	if (pcie->ssc) {
 		ret = brcm_pcie_set_ssc(pcie);
 		if (ret == 0)