/branches/gl-inet/target/linux/ipq806x/patches-4.14/0071-6-PCI-qcom-Force-GEN1-support.patch/0071-6-PCI-qcom-Force-GEN1-support.patch |
@@ -0,0 +1,61 @@ |
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)) |