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From 51ed2c2b60265006bde7531d10993cf24def0aee Mon Sep 17 00:00:00 2001
From: Sham Muthayyan <smuthayy@codeaurora.org>
Date: Mon, 15 Jun 2020 23:06:07 +0200
Subject: PCI: qcom: Support pci speed set for ipq806x
Some SoC based on ipq8064/5 needs to be limited to pci GEN1 speed due to
some hardware limitations. Add support for speed setting defined by the
max-link-speed binding. If not defined the max speed is set to GEN2 by
default.
Link: https://lore.kernel.org/r/20200615210608.21469-12-ansuelsmth@gmail.com
Signed-off-by: Sham Muthayyan <smuthayy@codeaurora.org>
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Stanimir Varbanov <svarbanov@mm-sol.com>
---
Backported with light changes:
* One include is missing in kernel 5.4
drivers/pci/controller/dwc/pcie-qcom.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -27,6 +27,7 @@
#include <linux/slab.h>
#include <linux/types.h>
+#include "../../pci.h"
#include "pcie-designware.h"
#define PCIE20_PARF_SYS_CTRL 0x00
@@ -98,6 +99,8 @@
#define PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE 0x358
#define SLV_ADDR_SPACE_SZ 0x10000000
+#define PCIE20_LNK_CONTROL2_LINK_STATUS2 0xa0
+
#define QCOM_PCIE_2_1_0_MAX_SUPPLY 3
#define QCOM_PCIE_2_1_0_MAX_CLOCKS 5
struct qcom_pcie_resources_2_1_0 {
@@ -184,6 +187,7 @@ struct qcom_pcie {
struct phy *phy;
struct gpio_desc *reset;
const struct qcom_pcie_ops *ops;
+ int gen;
};
#define to_qcom_pcie(x) dev_get_drvdata((x)->dev)
@@ -384,6 +388,11 @@ static int qcom_pcie_init_2_1_0(struct q
/* wait for clock acquisition */
usleep_range(1000, 1500);
+ if (pcie->gen == 1) {
+ val = readl(pci->dbi_base + PCIE20_LNK_CONTROL2_LINK_STATUS2);
+ val |= PCI_EXP_LNKSTA_CLS_2_5GB;
+ writel(val, pci->dbi_base + PCIE20_LNK_CONTROL2_LINK_STATUS2);
+ }
/* Set the Max TLP size to 2K, instead of using default of 4K */
writel(CFG_REMOTE_RD_REQ_BRIDGE_SIZE_2K,
@@ -1248,6 +1257,10 @@ static int qcom_pcie_probe(struct platfo
goto err_pm_runtime_put;
}
+ pcie->gen = of_pci_get_max_link_speed(pdev->dev.of_node);
+ if (pcie->gen < 0)
+ pcie->gen = 2;
+
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "parf");
pcie->parf = devm_ioremap_resource(dev, res);
if (IS_ERR(pcie->parf)) {
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