PCI: imx6: Convert DIRECT_SPEED_CHANGE quirk code to use a flag

Both i.MX7D and i.MX8MQ have the same behaviour when it comes to
clearing DIRECT_SPEED_CHANGE bit when no speed change occurs, so to
handle variants correctly add a flag instead of checking the IP block
variant.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
[lorenzo.pieralisi@arm.com: updated log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Leonard Crestez <leonard.crestez@nxp.com>
Cc: "A.s. Dong" <aisheng.dong@nxp.com>
Cc: Richard Zhu <hongxing.zhu@nxp.com>

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

@@ -42,6 +42,7 @@ enum imx6_pcie_variants {
 };
 
 #define IMX6_PCIE_FLAG_IMX6_PHY			BIT(0)
+#define IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE	BIT(1)
 
 struct imx6_pcie_drvdata {
 	enum imx6_pcie_variants variant;
@@ -710,7 +711,8 @@ static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie)
 		tmp |= PORT_LOGIC_SPEED_CHANGE;
 		dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, tmp);
 
-		if (imx6_pcie->drvdata->variant != IMX7D) {
+		if (imx6_pcie->drvdata->flags &
+		    IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE) {
 			/*
 			 * On i.MX7, DIRECT_SPEED_CHANGE behaves differently
 			 * from i.MX6 family when no link speed transition
@@ -1099,15 +1101,18 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
 static const struct imx6_pcie_drvdata drvdata[] = {
 	[IMX6Q] = {
 		.variant = IMX6Q,
-		.flags = IMX6_PCIE_FLAG_IMX6_PHY,
+		.flags = IMX6_PCIE_FLAG_IMX6_PHY |
+			 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE,
 	},
 	[IMX6SX] = {
 		.variant = IMX6SX,
-		.flags = IMX6_PCIE_FLAG_IMX6_PHY,
+		.flags = IMX6_PCIE_FLAG_IMX6_PHY |
+			 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE,
 	},
 	[IMX6QP] = {
 		.variant = IMX6QP,
-		.flags = IMX6_PCIE_FLAG_IMX6_PHY,
+		.flags = IMX6_PCIE_FLAG_IMX6_PHY |
+			 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE,
 	},
 	[IMX7D] = {
 		.variant = IMX7D,