WiFi芯片RTL8821CS，系统软重启后不能正常工作

问题：Rockchip RV1109平台，系统软重启后，wifi模块不能正常工作；断电重启后，wifi模块正常。

Rockchip回复：RTL8821CS 这颗模块比较特别， 由于模块CHIP_EN 没有引出来，reboot时断电不完全。所以RK参考设计是有用单独gpio控电vbat,这个要看你们硬件设计，是否预留相应gpio。可打下面补丁进行控制。

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi

index a4076b888f7d..1bd289e2b4bc 100644

--- a/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi

+++ b/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi

@@ -100,7 +100,7 @@

         clocks = <&rk808 1>;

         clock-names = "ext_clock";

         pinctrl-names = "default";

-        pinctrl-0 = <&wifi_enable_h>;

+        pinctrl-0 = <&wifi_enable_h &wifi_poweren_h>;

         /*

          * On the module itself this is one of these (depending

@@ -109,6 +109,7 @@

          * - PDN (power down when low)

          */

         reset-gpios = <&gpio0 10 GPIO_ACTIVE_LOW>; /* GPIO0_B2 */

+        poweren-gpios = <&gpio0 8 GPIO_ACTIVE_LOW>; /* GPIO0_B2 */

     };

     vcc3v3_sys: vcc3v3-sys {

@@ -731,4 +732,14 @@

             rockchip,pins = <1 2 RK_FUNC_GPIO &pcfg_pull_up>;

         };

     };

+

+     sdio-pwrseq {

+                wifi_enable_h: wifi-enable-h {

+                        rockchip,pins = <0 RK_PB2 RK_FUNC_GPIO &pcfg_pull_none>;

+                };

+               

+                wifi_poweren_h: wifi-poweren-h {

+                        rockchip,pins = <0 RK_PB0 RK_FUNC_GPIO &pcfg_pull_up>;

+                };

+     };

};

--- a/drivers/mmc/core/pwrseq_simple.c

+++ b/drivers/mmc/core/pwrseq_simple.c

@@ -14,6 +14,7 @@

#include <linux/err.h>

#include <linux/of_gpio.h>

#include <linux/gpio/consumer.h>

+#include <linux/delay.h>

#include <linux/mmc/host.h>

@@ -24,12 +25,27 @@ struct mmc_pwrseq_simple {

        bool clk_enabled;

        struct clk *ext_clk;

        struct gpio_descs *reset_gpios;

+       struct gpio_descs *poweren_gpios;

};

static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,

                                              int value)

{

        struct gpio_descs *reset_gpios = pwrseq->reset_gpios;

+       struct gpio_descs *poweren_gpios = pwrseq->poweren_gpios;

+

+       if (!IS_ERR(poweren_gpios)) {

+               int i;

+               int values[poweren_gpios->ndescs];

+

+               for (i = 0; i < poweren_gpios->ndescs; i++)

+                       values[i] = value;

+

+               gpiod_set_array_value_cansleep(

+                       poweren_gpios->ndescs, poweren_gpios->desc, values);

+       }

+

+       msleep(200); //200ms

        if (!IS_ERR(reset_gpios)) {

                int i;

@@ -41,6 +57,7 @@ static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,

                gpiod_set_array_value_cansleep(

                        reset_gpios->ndescs, reset_gpios->desc, values);

        }

+

}

static void mmc_pwrseq_simple_pre_power_on(struct mmc_host *host)

@@ -122,6 +139,14 @@ struct mmc_pwrseq *mmc_pwrseq_simple_alloc(struct mmc_host *host,

                ret = PTR_ERR(pwrseq->reset_gpios);

                goto clk_put;

        }

+

+               pwrseq->poweren_gpios = gpiod_get_array(dev, "poweren", GPIOD_OUT_HIGH);

+       if (IS_ERR(pwrseq->poweren_gpios) &&

+           PTR_ERR(pwrseq->poweren_gpios) != -ENOENT &&

+           PTR_ERR(pwrseq->poweren_gpios) != -ENOSYS) {

+               ret = PTR_ERR(pwrseq->poweren_gpios);

+               //goto clk_put;

+       }

        pwrseq->pwrseq.ops = &mmc_pwrseq_simple_ops;