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dm: usb: tegra: Tidy up error handling and a static function

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Try to return useful error numbers where possible. Also avoid swallowing
an error number when it is returned by a called function.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Simon Glass 2015-03-25 12:22:46 -06:00
parent 943104f07c
commit 7e27bddae0
1 changed files with 11 additions and 8 deletions
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19
drivers/usb/host/ehci-tegra.c
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@ -266,7 +266,8 @@ static void set_up_vbus(struct fdt_usb *config, enum usb_init_type init)
}
}
void usbf_reset_controller(struct fdt_usb *config, struct usb_ctlr *usbctlr)
static void usbf_reset_controller(struct fdt_usb *config,
struct usb_ctlr *usbctlr)
{
/* Reset the USB controller with 2us delay */
reset_periph(config->periph_id, 2);
@ -524,7 +525,7 @@ static int init_utmi_usb_controller(struct fdt_usb *config,
udelay(1);
}
if (!loop_count)
return -1;
return -ETIMEDOUT;
/* Disable ICUSB FS/LS transceiver */
clrbits_le32(&usbctlr->icusb_ctrl, IC_ENB1);
@ -567,6 +568,7 @@ static int init_ulpi_usb_controller(struct fdt_usb *config,
int loop_count;
struct ulpi_viewport ulpi_vp;
struct usb_ctlr *usbctlr = config->reg;
int ret;
/* set up ULPI reference clock on pllp_out4 */
clock_enable(PERIPH_ID_DEV2_OUT);
@ -612,9 +614,10 @@ static int init_ulpi_usb_controller(struct fdt_usb *config,
ulpi_vp.port_num = 0;
ulpi_vp.viewport_addr = (u32)&usbctlr->ulpi_viewport;
if (ulpi_init(&ulpi_vp)) {
ret = ulpi_init(&ulpi_vp);
if (ret) {
printf("Tegra ULPI viewport init failed\n");
return -1;
return ret;
}
ulpi_set_vbus(&ulpi_vp, 1, 1);
@ -631,7 +634,7 @@ static int init_ulpi_usb_controller(struct fdt_usb *config,
udelay(1);
}
if (!loop_count)
return -1;
return -ETIMEDOUT;
clrbits_le32(&usbctlr->susp_ctrl, USB_SUSP_CLR);
return 0;
@ -642,7 +645,7 @@ static int init_ulpi_usb_controller(struct fdt_usb *config,
{
printf("No code to set up ULPI controller, please enable"
"CONFIG_USB_ULPI and CONFIG_USB_ULPI_VIEWPORT");
return -1;
return -ENOSYS;
}
#endif
@ -669,7 +672,7 @@ static int fdt_decode_usb(const void *blob, int node, struct fdt_usb *config)
else {
debug("%s: Cannot decode dr_mode '%s'\n", __func__,
mode);
return -FDT_ERR_NOTFOUND;
return -EINVAL;
}
} else {
config->dr_mode = DR_MODE_HOST;
@ -684,7 +687,7 @@ static int fdt_decode_usb(const void *blob, int node, struct fdt_usb *config)
config->periph_id = clock_decode_periph_id(blob, node);
if (config->periph_id == PERIPH_ID_NONE) {
debug("%s: Missing/invalid peripheral ID\n", __func__);
return -FDT_ERR_NOTFOUND;
return -EINVAL;
}
gpio_request_by_name_nodev(blob, node, "nvidia,vbus-gpio", 0,
&config->vbus_gpio, GPIOD_IS_OUT);