RK3568-ANDROID11-5G-RM500Q-PCIE
实际原理图
一、先配置硬件接线
vcc3v3_pcie: gpio-regulator {
compatible = "regulator-fixed";
regulator-name = "vcc3v3_pcie";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
enable-active-high;
gpio = <&gpio0 RK_PD4 GPIO_ACTIVE_LOW>;
startup-delay-us = <5000>;
vin-supply = <&dc_12v>;
regulator-always-on;
regulator-boot-on;
};然后时钟信号正常
然后测到电源3.7V 和使能3.3V供电
然后根据RK文档配置PCIE功能
&pcie30phy {
status = "okay";
};
&pcie3x1 {
rockchip,bifurcation;
reset-gpios = <&gpio0 RK_PC3 GPIO_ACTIVE_HIGH>;
vpcie3v3-supply = <&vcc3v3_pcie>;
status = "okay";
};
&pcie3x2 {
rockchip,bifurcation;
reset-gpios = <&gpio0 RK_PD5 GPIO_ACTIVE_LOW>;
vpcie3v3-supply = <&vcc3v3_pcie>;
status = "okay";
};配置完成DTS
二、配置5G模块模式
//我用的是以下模式
at+qcfg="USBNET"，0
at+qcfg="data_interface",1,0
AT+QCFG="pcie/mode",1三、驱动移植，根据Quectel_Linux_PCIE_MHI_Driver_V1.3.1.zip
1. porting pcie_mhi driver as next
$ git diff drivers/Makefile
diff --git a/drivers/Makefile b/drivers/Makefile
index 77fbc52..e45837e 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -184,3 +184,4 @@ obj-$(CONFIG_FPGA) += fpga/
obj-$(CONFIG_FSI) += fsi/
obj-$(CONFIG_TEE) += tee/
obj-$(CONFIG_MULTIPLEXER) += mux/
+obj-y += pcie_mhi/
$ tree drivers/pcie_mhi/ -L 1
drivers/pcie_mhi/
controllers
core
devices
Makefile四、修改驱动
4. IPQ PCIE 识别代码流程
4.1 IPQ 拉低 PCIE_RESET
drivers/pci/host/pcie-qcom.c
static void qcom_ep_reset_assert(struct qcom_pcie *pcie)
{
//gpiod_set_value(pcie->reset, 1); //carl.yin delete this, will cause x55 link fail, i donot know why
usleep_range(PERST_DELAY_US, PERST_DELAY_US + 500);
}
4.2 IPQ 拉高 PCIE_RESET
drivers/pci/host/pcie-qcom.c
static void qcom_ep_reset_deassert(struct qcom_pcie *pcie)
{
gpiod_set_value(pcie->reset, 0);
usleep_range(PERST_DELAY_US, PERST_DELAY_US + 500);
}
4.3 IPQ 开始PCIE识别, 默认识别10次，间隔100ms. 如果在这段时间内，SDX55的PCIE 没有READY,
会导致识别不成功, 可适当加大识别次数
drivers/pci/host/pcie-designware.c
int dw_pcie_wait_for_link(struct pcie_port *pp)
{
int retries;
/* check if the link is up or not */
for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
if (dw_pcie_link_up(pp)) {
//如果识别成功，会打印如下代码的 LOG
dev_info(pp->dev, "link up. retries %d\n", retries);
return 0;
}
usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
if (strstr(dev_name(pp->dev), "20000000")) {
//usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
//usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
}
}
//如果识别不成功，会打印如下代码的 LOG
dev_err(pp->dev, "phy link never came up. retries %d\n", retries);
return -ETIMEDOUT;
}五、可能需要配置4G移植好的RILD库
RK3568-ANDROID11-4G-EC20-(详细步骤)_longmin96的博客-CSDN博客
六、看到图标
七、测速看一下网络
八、关电插上M.2开机，完成
九、遇到问题
[ 0.555786] phy phy-fe8c0000.phy.8: phy init failed --> -110
[ 0.555802] rk-pcie 3c0400000.pcie: fail to init phy, err -110
[ 0.555816] rk-pcie 3c0400000.pcie: phy init failed解决：打开晶振芯片电源GPIO，看到晶振起振