RK3588 & Android12 调试 RTL8852BE（wifi篇）_rk8852be

平台：RK3588 & Android12

模块：RTL8852BE

接口：PCIE

内容：调试RTL8852BE模块的WiFi功能

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一、内核

1.1 dts配置

首先是配置PCIE，查看原理图，看一下模块用的哪一个PCIE

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很明显，这里接到了Mux1上，Mux1的 PHY(combphy1_ps)配合PCIe30x1_0(dts命名为pcie2x1l0)，所以配置如下：

	vcc3v3_pcie20_wifi: vcc3v3-pcie20-wifi {
		compatible = "regulator-fixed";
		regulator-name = "vcc3v3_pcie20_wifi";
		regulator-min-microvolt = <3300000>;
		regulator-max-microvolt = <3300000>;
		enable-active-high;
        /*
         * wifi_reg_on 是在vbat、vddio稳定后才使能，在reset-gpios前拉高，所以
         * 放到PCIe的电源节点中才满足模块时序。
         */
		gpios = <&gpio0 RK_PC4 GPIO_ACTIVE_HIGH>;
		startup-delay-us = <5000>;
		vin-supply = <&vcc12v_dcin>;
	};
 
&combphy1_ps {
	status = "okay";
};
 
&pcie2x1l0 {
	reset-gpios = <&gpio1 RK_PB2 GPIO_ACTIVE_HIGH>;
	rockchip,skip-scan-in-resume;
	status = "okay";
};

然后配置WiFi：

wireless_wlan: wireless-wlan {
		compatible = "wlan-platdata";
		wifi_chip_type = "rtl8852be";
		pinctrl-names = "default";
		pinctrl-0 = <&wifi_host_wake_irq>, <&wifi_poweren_gpio>;
		WIFI,host_wake_irq = <&gpio0 RK_PB2 GPIO_ACTIVE_HIGH>;
        /* 不能这里控制wifi_reg_on管脚，请挪到vcc3v3_pcie20_wifi */
		//WIFI,poweren_gpio = <&gpio0  RK_PC4 GPIO_ACTIVE_HIGH>;
		status = "okay";
	};

&pinctrl添加：

	wireless-wlan {
		wifi_host_wake_irq: wifi-host-wake-irq {
			rockchip,pins = <0 RK_PB2 RK_FUNC_GPIO &pcfg_pull_down>;
		};
 
		wifi_poweren_gpio: wifi-poweren-gpio {
			rockchip,pins = <0 RK_PC4 RK_FUNC_GPIO &pcfg_pull_up>;
		};

配好这些模块应该就挂到pcie上了：

2.1 驱动

RK3588似乎并没有兼容RTL8852BE这个模块，驱动需要问供应商要，存放路径

SDK\kernel-5.10\drivers\net\wireless\rockchip_wlan

二、系统层

由于SDK没有兼容RTL8852BE，所以要修改一些文件，让系统自动加载对应的ko文件

SDK\frameworks\opt\net\wifi\libwifi_hal\rk_wifi_ctrl.cpp

++    #define RTL8852BE_DRIVER_MODULE_PATH     WIFI_MODULE_PATH"8852be.ko"
++    #define RTL8852BE_DRIVER_MODULE_NAME     "8852be"
 
static wifi_device supported_wifi_devices[] = {
++    {"RTL8852BE",	"10ec:b852"},
...
 
const wifi_file_name module_list[] = {
++    {"RTL8852BE", RTL8852BE_DRIVER_MODULE_NAME, RTL8852BE_DRIVER_MODULE_PATH, UNKOWN_DRIVER_MODULE_ARG, REALTEK_WIFI_HAL},
...

其实就是照葫芦画瓢，对着兼容的模块的写法去写。

三、遇到的问题

3.1 驱动报错

1）报错信息：

drivers/net/wireless/rockchip_wlan/rtl8852be/Kconfig:5: syntax error
drivers/net/wireless/rockchip_wlan/rtl8852be/Kconfig:4: unknown statement "---help---"
drivers/net/wireless/rockchip_wlan/rtl8852be/Kconfig:5: unknown statement "Help"

Kconfig语法有错，---help---改成help即可

2）报错信息：

error: "Must be LITTLE/BIG Endian Host"
error: declaration of 'struct cfg80211_csa_settings' will not be visible outside of this function [-Werror,-Wvisibility]

没有选择对应的平台

修改Makefile：

--    CONFIG_PLATFORM_I386_PC = y
++    CONFIG_PLATFORM_I386_PC = n
 
--    CONFIG_PLATFORM_ARM_ROCKCHIP = n
++    CONFIG_PLATFORM_ARM_ROCKCHIP = y
 
# Import platform assigned KSRC and CROSS_COMPILE
--    include $(wildcard $(DRV_PATH)/platform/*.mk)
++    include $(src)/platform/arm_rk.mk

需要查看驱动 platform 目录下的相关文件，看包含哪个。

3）报错信息：

drivers/net/wireless/rockchip_wlan/rtl8852be/core/rtw_mlme.c:5359:27: error: equality comparison with extraneous parentheses [-Werror,-Wparentheses-equality]
        if ((pregpriv->wifi_spec == 1))
 
drivers/net/wireless/rockchip_wlan/rtl8852be/phl/hal_g6/mac/mac_ax/trxcfg.c:1253:9: error: explicitly assigning value of variable of type 'u32' (aka 'unsigned int') to itself [-Werror,-Wself-assign]
                val32 = val32;

报类似上面的错误，改了一个又出来另一个，直接修改 Makefile 禁止此类报错

EXTRA_CFLAGS += -Wno-tautological-overlap-compare
EXTRA_CFLAGS += -Wno-pointer-bool-conversion
++    EXTRA_CFLAGS += -Wno-parentheses-equality
++    EXTRA_CFLAGS += -Wno-self-assign

加的编译选项其实和报错信息差不多，其它类似报错照葫芦画瓢，大概用途：

-Wno-uninitialized：禁止未初始化变量的警告
-Wno-enum-conversion：禁止枚举类型转换警告
-Wno-fortify-source：禁止源码加固警告
-Wno-invalid-source-encoding：禁止无效的源码编码警告
-Wno-tautological-pointer-compare：禁止指针比较警告
-Wno-tautological-overlap-compare：禁止重叠比较警告
-Wno-pointer-bool-conversion：禁止指针转布尔型警告
-Wno-parentheses-equality：禁止多余括号的比较警告
-Wno-self-assign：禁止变量自赋值警告
-Wno-header-guard：禁止头文件守卫重复定义警告

4）报错信息：

ERROR: modpost: module 8852be uses symbol kernel_write from namespace VFS_internal_I_am_really_a_filesystem_and_am_NOT_a_driver, but does not import it.
ERROR: modpost: module 8852be uses symbol kernel_read from namespace VFS_internal_I_am_really_a_filesystem_and_am_NOT_a_driver, but does not import it.
ERROR: modpost: module 8852be uses symbol filp_open from namespace VFS_internal_I_am_really_a_filesystem_and_am_NOT_a_driver, but does not import it.

缺少相关命名空间，查找引用了 kernel_write 的文件，加入命名空间：

MODULE_IMPORT_NS(VFS_internal_I_am_really_a_filesystem_and_am_NOT_a_driver);

四、参考文章

高版本linux内核编译驱动报错记录_uses symbol kernel_write from namespace vfs_intern-CSDN博客

RK3568-B2-ANDROID11-WIFI-RTL8821CU_rk平台rtl8821cu调试-CSDN博客

五、资料包

内含改好编好的驱动以及相关参考文档

链接：https://pan.baidu.com/s/1xU_dgcywp86gLfZOceabFA 
提取码：zesv 
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