I have an ASUS TF101(ventana) that I am trying to get running on
mainline. It is mostly there, but there are a few issues that I believe
to be dts related. I am focusing on one at a time. Currently, when I
warm boot/reboot, the wireless SDIO device fails to initialize. It
works great on cold boot. I'm fairly certain the problem is in the
dts, but I'd like some feedback on the correct way.
>From a working, pre-dts kernel I have stuff like this.
arch/arm/mach-tegra/board-tf101-sdhci.c:
...
#define TF101_WLAN_RST TEGRA_GPIO_PK6
#define TF101_WLAN_WOW TEGRA_GPIO_PS0
#define TF101_SDIO_WOW TEGRA_GPIO_PY6
...
static struct embedded_sdio_data embedded_sdio_data1 = {
.cccr = {
.sdio_vsn = 2,
.multi_block = 1,
.low_speed = 0,
.wide_bus = 0,
.high_power = 1,
.high_speed = 1,
},
.cis = {
.vendor = 0x02d0,
.device = 0x4329,
},
static struct tegra_sdhci_platform_data tegra_sdhci_platform_data1 = {
.mmc_data = {
.register_status_notify = tf101_wifi_status_register,
.embedded_sdio = &embedded_sdio_data1,
.built_in = 0,
},
.wow_gpio = TF101_SDIO_WOW,
.cd_gpio = -1,
.wp_gpio = -1,
.power_gpio = -1,
.max_clk_limit = 40000000,
};
...
static int tf101_wifi_power(int on)
{
pr_debug("%s: %d\n", __func__, on);
#if 0
gpio_set_value(TF101_WLAN_PWR, on);
mdelay(100);
#endif
gpio_set_value(TF101_WLAN_RST, on);
mdelay(200);
return 0;
}
static int tf101_wifi_reset(int on)
{
pr_debug("%s: do nothing\n", __func__);
return 0;
}
static int __init tf101_wifi_init(void)
{
//gpio_request(TF101_WLAN_PWR, "wlan_power");
gpio_request(TF101_WLAN_RST, "wlan_rst");
gpio_request(TF101_WLAN_WOW, "bcmsdh_sdmmc");
//tegra_gpio_enable(TF101_WLAN_PWR);
tegra_gpio_enable(TF101_WLAN_RST);
tegra_gpio_enable(TF101_WLAN_WOW);
//gpio_direction_output(TF101_WLAN_PWR, 0);
gpio_direction_output(TF101_WLAN_RST, 0);
gpio_direction_input(TF101_WLAN_WOW);
platform_device_register(&tf101_wifi_device);
device_init_wakeup(&tf101_wifi_device.dev, 1);
device_set_wakeup_enable(&tf101_wifi_device.dev, 0);
return 0;
}
...
It looks like I have three GPIO lines dealing with mmc0/wlan. Can I
assume WOW is Wireless pOWer?
I'm not sure of the difference between WLAN_WOW & SDIO_WOW. I'm
assuming one for chip, one for radio, but I don't know their place in
the dts.
>From tegra20-ventana.dts I've got:
sdhci@c8000000 {
status = "okay";
power-gpios = <&gpio TEGRA_GPIO(K, 6) GPIO_ACTIVE_HIGH>;
bus-width = <4>;
keep-power-in-suspend;
};
I'm guessing I need to add the other pins to power-gpois and
set up mmc-pwrseq?
Regards,
Kyle
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