Disabling cd,wp signals with wifi modules

[chenli_2016]

Hi All

Our custom product is refer to i.MX6Q SABRE and  we are porting wifi module to Android 5.1 which use 3.14.52 kernel.

We just encounter a problem: our wifi module is ap6335 which  is soldered into the board, Theoretically,there is no need to handle card detect / write protect on this port.

but ,without  cd_gpio and wp_gpio configuration in dts file, we just can't load this wifi's driver:

======== bcm_wlan_set_plat_data ========

GPIO(WL_HOST_WAKE) = GPIO_4_25

host_oob_irq: 281

host_oob_irq_flags=4

dhd_wifi_platform_load: Enter

Power-up adapter 'DHD generic adapter'

wifi_platform_set_power = 1

wifi_platform_bus_enumerate device present 1

======== Card detection to detect SDIO card! ========

failed to power up DHD generic adapter, 3 retry left

wifi_platform_set_power = 0

wifi_platform_bus_enumerate device present 0

======== Card detection to remove SDIO card! ========

wifi_platform_set_power = 1

wifi_platform_bus_enumerate device present 1

======== Card detection to detect SDIO card! ========

failed to power up DHD generic adapter, 2 retry left

wifi_platform_set_power = 0

wifi_platform_bus_enumerate device present 0

======== Card detection to remove SDIO card! ========

wifi_platform_set_power = 1

wifi_platform_bus_enumerate device present 1

======== Card detection to detect SDIO card! ========

failed to power up DHD generic adapter, 1 retry left

wifi_platform_set_power = 0

wifi_platform_bus_enumerate device present 0

======== Card detection to remove SDIO card! ========

wifi_platform_set_power = 1

We have ported this wifi module on Android 4.4.2 before ,which use 3.0.35 kernel ,the solution to this problem was to make cd_gpio = -EINVAL, like this:

/*connect to wifi module*/

static const struct esdhc_platform_data mx6q_sabresd_sd2_data __initconst = {

    .cd_gpio = -EINVAL,

    .wp_gpio = -EINVAL,

    .keep_power_at_suspend = 1,

    .support_8bit = 0,

    .delay_line = 0,

    .cd_type = ESDHC_CD_CONTROLLER,

    .always_present=1,

    .runtime_pm = 1,

};

....

static void __init mx6_sabresd_board_init(void)

{

....

   imx6q_add_sdhci_usdhc_imx(1, &mx6q_sabresd_sd2_data);

...

}

now, in android 5.1, we try to configure dts file like this in 3.14.52 kernel:

&usdhc2 {

    pinctrl-names = "default";

    pinctrl-0 = <&pinctrl_usdhc2>;

    bus-width = <4>;

    //cd-gpios = <&gpio5 16 0>;

    //wp-gpios = <&gpio5 13 0>;

    no-1-8-v;

    non-removable;

    wifi-host;

    pm-ignore-notify;

    keep-power-in-suspend;

    //enable-sdio-wakeup;

    status = "okay";

};

but they don't seem to help.

our question is : how can we configure these two gpios (without using cd_gpio and wp_gpio) in  3.14.52 kernel to solve our wifi driver load problem?

[igorpadykov]

Hi li

i.MX6Q Sabre board uses emmc on SD4 as non-removable media, imx6qdl-sabresd.dtsi

linux-2.6-imx.git - Freescale i.MX Linux Tree

In general one can debug  drivers/mmc/host//sdhci-esdhc-imx.c,

please also check attached Linux Manual Chapter 47 Wi-Fi BCM4339 Driver,

Chapter 33 MMC/SD/SDIO Host Driver

http://wireless.murata.com/datasheet?/RFM/data/murata_quick_start_guide_linux.pdf

http://wireless.murata.com/datasheet?/RFM/data/murata_quick_start_guide_android.pdf

Best regards

igor

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