[U-Boot] [PATCH v4 4/4] Tegra: MMC: Add DT support to MMC driver for all T20 boards

[Stephen Warren <swarren@wwwdotorg.org>]

On 02/14/2013 02:04 PM, Tom Warren wrote:
> tegra_mmc_init() now parses the DT info for bus width, WP/CD GPIOs, etc.
> Tested on Seaboard, fully functional.
> 
> Tamonten boards (medcom-wide, plutux, and tec) use a different/new
> dtsi file w/common settings.

> diff --git a/drivers/mmc/tegra_mmc.c b/drivers/mmc/tegra_mmc.c

> @@ -515,44 +483,47 @@ static int mmc_core_init(struct mmc *mmc)
>  int tegra_mmc_getcd(struct mmc *mmc)
>  {
>  	struct mmc_host *host = (struct mmc_host *)mmc->priv;
> +	debug("%s called, host->cd_gpio = 0x%08X\n", __func__,
> +		(unsigned)&host->cd_gpio);

That last line should be:

host->cd_gpio.gpio;

The case is because it's a struct address, not the GPIO you want to print.

> +static int do_mmc_init(int dev_index)

> -	if (host->pwr_gpio >= 0) {
> +	if (fdt_gpio_isvalid(&host->pwr_gpio)) {
>  		sprintf(gpusage, "SD/MMC%d PWR", dev_index);
> -		gpio_request(host->pwr_gpio, gpusage);
> -		gpio_direction_output(host->pwr_gpio, 1);
> +		gpio_request(host->pwr_gpio.gpio, gpusage);
> +		fdtdec_set_gpio(&host->pwr_gpio, 1);

That change completely removes the call to gpio_direction_output;
fdtdec_set_gpio() doesn't do that. This is the cause of the problem on
PAZ00, and Harmony.

> -	if (host->cd_gpio >= 0) {
> +	if (fdt_gpio_isvalid(&host->cd_gpio)) {
>  		sprintf(gpusage, "SD/MMC%d CD", dev_index);
> -		gpio_request(host->cd_gpio, gpusage);
> -		gpio_direction_input(host->cd_gpio);
> +		gpio_request(host->cd_gpio.gpio, gpusage);
> +		card_det = fdtdec_get_gpio(&host->cd_gpio);

Similarly, this change removes the call to gpio_direction_input();
fdtdec_get_gpio() just reads the GPIO's value and is pointless here.

I'll go retest all the boards after fixing that...