Disabling cd,wp signals with wifi modules

chenli_2016 — Wed, 17 Aug 2016 08:41:22 GMT

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?

Re: Disabling cd,wp signals with wifi modules

igorpadykov — Wed, 17 Aug 2016 12:18:07 GMT

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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Disabling cd,wp signals with wifi modules

Re: Disabling cd,wp signals with wifi modules