openwrt/target/linux/mvebu/patches-4.19/527-PCI-aardvark-allow-to-specify-link-capability.patch

From f70b629e488cc3f2a325ac35476f4f7ae502c5d0 Mon Sep 17 00:00:00 2001
From: Tomasz Maciej Nowak <tmn505@gmail.com>
Date: Thu, 14 Jun 2018 14:24:40 +0200
Subject: [PATCH 1/2] PCI: aardvark: allow to specify link capability

Use DT of_pci_get_max_link_speed() facility to allow specifying link
capability. If none or unspecified value is given it falls back to gen2,
which is default for Armada 3700 SoC.

Signed-off-by: Tomasz Maciej Nowak <tmn505@gmail.com>
---
 drivers/pci/controller/pci-aardvark.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -233,6 +233,8 @@ static int advk_pcie_wait_for_link(struc
 
 static void advk_pcie_setup_hw(struct advk_pcie *pcie)
 {
+	struct device *dev = &pcie->pdev->dev;
+	struct device_node *node = dev->of_node;
 	u32 reg;
 
 	/* Set to Direct mode */
@@ -267,10 +269,15 @@ static void advk_pcie_setup_hw(struct ad
 		PCIE_CORE_CTRL2_TD_ENABLE;
 	advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG);
 
-	/* Set GEN2 */
+	/* Set GEN */
 	reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
 	reg &= ~PCIE_GEN_SEL_MSK;
-	reg |= SPEED_GEN_2;
+	if (of_pci_get_max_link_speed(node) == 1)
+		reg |= SPEED_GEN_1;
+	else if (of_pci_get_max_link_speed(node) == 3)
+		reg |= SPEED_GEN_3;
+	else
+		reg |= SPEED_GEN_2;
 	advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
 
 	/* Set lane X1 */