From 4910cfd150342ec7b038892262923c725a9c4001 Mon Sep 17 00:00:00 2001 From: Sham Muthayyan Date: Wed, 7 Sep 2016 16:44:28 +0530 Subject: PCI: qcom: Force GEN1 support Change-Id: Ica54ddb737d7b851469deab1745f54bf431bd3f0 Signed-off-by: Sham Muthayyan --- drivers/pci/host/pcie-qcom.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) --- a/drivers/pci/host/pcie-qcom.c +++ b/drivers/pci/host/pcie-qcom.c @@ -90,6 +90,8 @@ #define PCIE20_PARF_CONFIG_BITS 0x50 #define PHY_RX0_EQ(x) (x << 24) +#define PCIE20_LNK_CONTROL2_LINK_STATUS2 0xA0 + struct qcom_pcie_resources_v0 { struct clk *iface_clk; struct clk *core_clk; @@ -138,6 +140,7 @@ struct qcom_pcie { struct phy *phy; struct gpio_desc *reset; struct qcom_pcie_ops *ops; + uint32_t force_gen1; }; #define to_qcom_pcie(x) container_of(x, struct qcom_pcie, pp) @@ -477,6 +480,11 @@ static int qcom_pcie_init_v0(struct qcom /* wait for clock acquisition */ usleep_range(1000, 1500); + if (pcie->force_gen1) { + writel_relaxed((readl_relaxed( + pcie->pp.dbi_base + PCIE20_LNK_CONTROL2_LINK_STATUS2) | 1), + pcie->pp.dbi_base + PCIE20_LNK_CONTROL2_LINK_STATUS2); + } qcom_pcie_prog_viewport_cfg0(pcie, MSM_PCIE_DEV_CFG_ADDR); qcom_pcie_prog_viewport_mem2_outbound(pcie); @@ -666,6 +674,8 @@ static int qcom_pcie_probe(struct platfo struct qcom_pcie *pcie; struct pcie_port *pp; 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) @@ -678,6 +688,9 @@ 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))