PCI: imx6: Enable i.MX6QP PCIe power management support

i.MX6QP PCIe supports the reset logic, thus it can reset itself to the
initialized state when exit from L2 or L3 states.

Enable the i.MX6QP PCIe suspend/resume operations support.

Link: https://lore.kernel.org/r/1645425237-4071-2-git-send-email-hongxing.zhu@nxp.comSigned-off-by: NRichard Zhu <hongxing.zhu@nxp.com>
Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: NLucas Stach <l.stach@pengutronix.de>

drivers/pci/controller/dwc/pci-imx6.c

@@ -917,6 +917,7 @@ static void imx6_pcie_pm_turnoff(struct imx6_pcie *imx6_pcie)
 	/* Others poke directly at IOMUXC registers */
 	switch (imx6_pcie->drvdata->variant) {
 	case IMX6SX:
+	case IMX6QP:
 		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
 				IMX6SX_GPR12_PCIE_PM_TURN_OFF,
 				IMX6SX_GPR12_PCIE_PM_TURN_OFF);
@@ -1246,7 +1247,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
 	[IMX6QP] = {
 		.variant = IMX6QP,
 		.flags = IMX6_PCIE_FLAG_IMX6_PHY |
-			 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE,
+			 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE |
+			 IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
 		.dbi_length = 0x200,
 	},
 	[IMX7D] = {