From: Shawn Lin <shawn.lin@rock-chips.com>
Date: Tue, 18 Oct 2016 01:45:10 +0000 (+0800)
Subject: UPSTREAM: PCI: rockchip: Specify the link capability
X-Git-Tag: firefly_0821_release~1234
X-Git-Url: http://plrg.eecs.uci.edu/git/?p=firefly-linux-kernel-4.4.55.git;a=commitdiff_plain;h=9d5d5ab0dc51bbc4dce45aca04e59a6cfeb41975;ds=sidebyside

UPSTREAM: PCI: rockchip: Specify the link capability

rk3399 supports PCIe 2.x link speeds marginally at best, and on some
boards, the link won't train at 5 GT/s at all. Rather than sacrifice
500ms waiting for training that will never happen, let's use the helper
function, of_pci_get_max_link_speed, to get the max link speed from DT
and specify link capability.

Change-Id: I899df707f0555eea8ae4a370b171a4786162bb90
Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
(am from git.kernel.org/cgit/linux/kernel/git/next/linux-next.git
commit 9d4052126b0deeb67552580ffe7f6383e0123c62)
---

diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c
index fd8620f92cae..f567518cb35c 100644
--- a/drivers/pci/host/pcie-rockchip.c
+++ b/drivers/pci/host/pcie-rockchip.c
@@ -53,6 +53,7 @@
 #define   PCIE_CLIENT_ARI_ENABLE	  HIWORD_UPDATE_BIT(0x0008)
 #define   PCIE_CLIENT_CONF_LANE_NUM(x)	  HIWORD_UPDATE(0x0030, ENCODE_LANES(x))
 #define   PCIE_CLIENT_MODE_RC		  HIWORD_UPDATE_BIT(0x0040)
+#define   PCIE_CLIENT_GEN_SEL_1		  HIWORD_UPDATE(0x0080, 0)
 #define   PCIE_CLIENT_GEN_SEL_2		  HIWORD_UPDATE_BIT(0x0080)
 #define PCIE_CLIENT_BASIC_STATUS1	(PCIE_CLIENT_BASE + 0x48)
 #define   PCIE_CLIENT_LINK_STATUS_UP		0x00300000
@@ -205,6 +206,7 @@ struct rockchip_pcie {
 	struct	gpio_desc *ep_gpio;
 	u32	lanes;
 	u8	root_bus_nr;
+	int	link_gen;
 	struct	device *dev;
 	struct	irq_domain *irq_domain;
 };
@@ -477,14 +479,20 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
 		return err;
 	}
 
+	if (rockchip->link_gen == 2)
+		rockchip_pcie_write(rockchip, PCIE_CLIENT_GEN_SEL_2,
+				    PCIE_CLIENT_CONFIG);
+	else
+		rockchip_pcie_write(rockchip, PCIE_CLIENT_GEN_SEL_1,
+				    PCIE_CLIENT_CONFIG);
+
 	rockchip_pcie_write(rockchip,
 			    PCIE_CLIENT_CONF_ENABLE |
 			    PCIE_CLIENT_LINK_TRAIN_ENABLE |
 			    PCIE_CLIENT_ARI_ENABLE |
 			    PCIE_CLIENT_CONF_LANE_NUM(rockchip->lanes) |
-			    PCIE_CLIENT_MODE_RC |
-			    PCIE_CLIENT_GEN_SEL_2,
-				PCIE_CLIENT_CONFIG);
+			    PCIE_CLIENT_MODE_RC,
+			    PCIE_CLIENT_CONFIG);
 
 	err = phy_power_on(rockchip->phy);
 	if (err) {
@@ -568,29 +576,31 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
 		msleep(20);
 	}
 
-	/*
-	 * Enable retrain for gen2. This should be configured only after
-	 * gen1 finished.
-	 */
-	status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
-	status |= PCIE_RC_CONFIG_LCS_RETRAIN_LINK;
-	rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
+	if (rockchip->link_gen == 2) {
+		/*
+		 * Enable retrain for gen2. This should be configured only after
+		 * gen1 finished.
+		 */
+		status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
+		status |= PCIE_RC_CONFIG_LCS_RETRAIN_LINK;
+		rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
+
+		timeout = jiffies + msecs_to_jiffies(500);
+		for (;;) {
+			status = rockchip_pcie_read(rockchip, PCIE_CORE_CTRL);
+			if ((status & PCIE_CORE_PL_CONF_SPEED_MASK) ==
+			    PCIE_CORE_PL_CONF_SPEED_5G) {
+				dev_dbg(dev, "PCIe link training gen2 pass!\n");
+				break;
+			}
 
-	timeout = jiffies + msecs_to_jiffies(500);
-	for (;;) {
-		status = rockchip_pcie_read(rockchip, PCIE_CORE_CTRL);
-		if ((status & PCIE_CORE_PL_CONF_SPEED_MASK) ==
-		    PCIE_CORE_PL_CONF_SPEED_5G) {
-			dev_dbg(dev, "PCIe link training gen2 pass!\n");
-			break;
-		}
+			if (time_after(jiffies, timeout)) {
+				dev_dbg(dev, "PCIe link training gen2 timeout, fall back to gen1!\n");
+				break;
+			}
 
-		if (time_after(jiffies, timeout)) {
-			dev_dbg(dev, "PCIe link training gen2 timeout, fall back to gen1!\n");
-			break;
+			msleep(20);
 		}
-
-		msleep(20);
 	}
 
 	/* Check the final link width from negotiated lane counter from MGMT */
@@ -799,6 +809,10 @@ static int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip)
 		rockchip->lanes = 1;
 	}
 
+	rockchip->link_gen = of_pci_get_max_link_speed(node);
+	if (rockchip->link_gen < 0 || rockchip->link_gen > 2)
+		rockchip->link_gen = 2;
+
 	rockchip->core_rst = devm_reset_control_get(dev, "core");
 	if (IS_ERR(rockchip->core_rst)) {
 		if (PTR_ERR(rockchip->core_rst) != -EPROBE_DEFER)