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Subject[PATCH 10/12] pcie: qcom: add Force GEN1 support
Date
From: Sham Muthayyan <smuthayy@codeaurora.org>

Add Force GEN1 support needed in some ipq806x board
that needs to limit some pcie line to gen1 for some
hardware limitation

Signed-off-by: Sham Muthayyan <smuthayy@codeaurora.org>
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
---
drivers/pci/controller/dwc/pcie-qcom.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index e26ba8f63d4f..03130a3206b4 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -123,6 +123,8 @@
#define PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE 0x358
#define SLV_ADDR_SPACE_SZ 0x10000000

+#define PCIE20_LNK_CONTROL2_LINK_STATUS2 0xA0
+
#define DEVICE_TYPE_RC 0x4

#define QCOM_PCIE_2_1_0_MAX_SUPPLY 3
@@ -223,6 +225,7 @@ struct qcom_pcie {
struct phy *phy;
struct gpio_desc *reset;
const struct qcom_pcie_ops *ops;
+ uint32_t force_gen1;
};

#define to_qcom_pcie(x) dev_get_drvdata((x)->dev)
@@ -515,6 +518,11 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)

/* 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 */
@@ -1487,6 +1495,8 @@ static int qcom_pcie_probe(struct platform_device *pdev)
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)
@@ -1517,6 +1527,9 @@ static int qcom_pcie_probe(struct platform_device *pdev)
goto err_pm_runtime_put;
}

+ 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)) {
--
2.25.1
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