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From 4910cfd150342ec7b038892262923c725a9c4001 Mon Sep 17 00:00:00 2001
From: Sham Muthayyan <smuthayy@codeaurora.org>
Date: Wed, 7 Sep 2016 16:44:28 +0530
Subject: PCI: qcom: Force GEN1 support
Change-Id: Ica54ddb737d7b851469deab1745f54bf431bd3f0
Signed-off-by: Sham Muthayyan <smuthayy@codeaurora.org>
---
drivers/pci/host/pcie-qcom.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
--- a/drivers/pci/dwc/pcie-qcom.c
+++ b/drivers/pci/dwc/pcie-qcom.c
@@ -129,6 +129,8 @@
#define PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE 0x358
#define SLV_ADDR_SPACE_SZ 0x10000000
+#define PCIE20_LNK_CONTROL2_LINK_STATUS2 0xA0
+
struct qcom_pcie_resources_2_1_0 {
struct clk *iface_clk;
struct clk *core_clk;
@@ -218,6 +220,7 @@ struct qcom_pcie {
struct phy *phy;
struct gpio_desc *reset;
struct qcom_pcie_ops *ops;
+ uint32_t force_gen1;
};
#define to_qcom_pcie(x) dev_get_drvdata((x)->dev)
@@ -532,6 +535,11 @@ static int qcom_pcie_init_2_1_0(struct q
/* wait for clock acquisition */
usleep_range(1000, 1500);
+ if (pcie->force_gen1) {
+ writel_relaxed((readl_relaxed(
+ pcie->pci->dbi_base + PCIE20_LNK_CONTROL2_LINK_STATUS2) | 1),
+ pcie->pci->dbi_base + PCIE20_LNK_CONTROL2_LINK_STATUS2);
+ }
/* Set the Max TLP size to 2K, instead of using default of 4K */
@@ -1382,6 +1390,8 @@ static int qcom_pcie_probe(struct platfo
struct dw_pcie *pci;
struct qcom_pcie *pcie;
int ret;
+ uint32_t force_gen1 = 0;
+ struct device_node *np = pdev->dev.of_node;
pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
if (!pcie)
@@ -1403,6 +1413,9 @@ static int qcom_pcie_probe(struct platfo
if (IS_ERR(pcie->reset))
return PTR_ERR(pcie->reset);
+ of_property_read_u32(np, "force_gen1", &force_gen1);
+ pcie->force_gen1 = force_gen1;
+
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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