mmc: sunxi: Fix misuse of gpio_direction_input()

It does not make sense to make gpio_direction_input() return the gpio input
status. The return value of gpio_direction_input() is inconsistent if
CONFIG_DM_GPIO is defined.
And we don't need to call gpio_direction_input() int sunxi_mmc_getcd().
Just init the gpio once in mmc_resource_init() is enough.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Ian Campbell <ijc@hellion.org.uk>

drivers/gpio/sunxi_gpio.c

@@ -75,7 +75,7 @@ int gpio_direction_input(unsigned gpio)
 {
 	sunxi_gpio_set_cfgpin(gpio, SUNXI_GPIO_INPUT);
 
-	return sunxi_gpio_input(gpio);
+	return 0;
 }
 
 int gpio_direction_output(unsigned gpio, int value)

drivers/mmc/sunxi_mmc.c

@@ -72,8 +72,11 @@ static int mmc_resource_init(int sdc_no)
 	mmchost->mmc_no = sdc_no;
 
 	cd_pin = sunxi_mmc_getcd_gpio(sdc_no);
-	if (cd_pin != -1)
+	if (cd_pin != -1) {
 		ret = gpio_request(cd_pin, "mmc_cd");
+		if (!ret)
+			ret = gpio_direction_input(cd_pin);
+	}
 
 	return ret;
 }
@@ -414,7 +417,7 @@ static int sunxi_mmc_getcd(struct mmc *mmc)
 	if (cd_pin == -1)
 		return 1;
 
-	return !gpio_direction_input(cd_pin);
+	return !gpio_get_value(cd_pin);
 }
 
 static const struct mmc_ops sunxi_mmc_ops = {