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Subject[PATCH v3 08/10] usb: phy: tegra: Add error handling & clean up.
Date
Check return values from all GPIO APIs and handle errors accordingly.

Remove the call to clk_disable_unprepare(); this function does not
prepare or enable the clock, so the error path should not disable or
unprepare it.

Signed-off-by: Venu Byravarasu <vbyravarasu@nvidia.com>
---
delta from v1:
no changes.

delta from v2:
Fixed checkpatch warnings.


drivers/usb/phy/phy-tegra-usb.c | 50 ++++++++++++++++++++++++++++++--------
1 files changed, 39 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
index a2a89a9..dce692a 100644
--- a/drivers/usb/phy/phy-tegra-usb.c
+++ b/drivers/usb/phy/phy-tegra-usb.c
@@ -542,9 +542,17 @@ static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
unsigned long val;
void __iomem *base = phy->regs;

- gpio_direction_output(phy->reset_gpio, 0);
+ ret = gpio_direction_output(phy->reset_gpio, 0);
+ if (ret < 0) {
+ dev_err(phy->dev, "gpio %d not set to 0\n", phy->reset_gpio);
+ return ret;
+ }
msleep(5);
- gpio_direction_output(phy->reset_gpio, 1);
+ ret = gpio_direction_output(phy->reset_gpio, 1);
+ if (ret < 0) {
+ dev_err(phy->dev, "gpio %d not set to 1\n", phy->reset_gpio);
+ return ret;
+ }

clk_prepare_enable(phy->clk);
msleep(1);
@@ -624,24 +632,44 @@ static int tegra_phy_init(struct usb_phy *x)
of_get_named_gpio(phy->dev->of_node,
"nvidia,phy-reset-gpio", 0);
if (!gpio_is_valid(phy->reset_gpio)) {
- pr_err("%s: invalid reset gpio: %d\n", __func__,
+ dev_err(phy->dev, "invalid gpio: %d\n",
+ phy->reset_gpio);
+ err = phy->reset_gpio;
+ goto cleanup_clk_get;
+ }
+
+ err = gpio_request(phy->reset_gpio, "ulpi_phy_reset_b");
+ if (err < 0) {
+ dev_err(phy->dev, "request failed for gpio: %d\n",
phy->reset_gpio);
- err = -EINVAL;
- goto err1;
+ goto cleanup_clk_get;
+ }
+
+ err = gpio_direction_output(phy->reset_gpio, 0);
+ if (err < 0) {
+ dev_err(phy->dev, "gpio %d direction not set to output\n",
+ phy->reset_gpio);
+ goto cleanup_gpio_req;
}
- gpio_request(phy->reset_gpio, "ulpi_phy_reset_b");
- gpio_direction_output(phy->reset_gpio, 0);
+
phy->ulpi = otg_ulpi_create(&ulpi_viewport_access_ops, 0);
+ if (!phy->ulpi) {
+ dev_err(phy->dev, "otg_ulpi_create returned err\n");
+ err = -ENOMEM;
+ goto cleanup_gpio_req;
+ }
+
phy->ulpi->io_priv = phy->regs + ULPI_VIEWPORT;
} else {
err = utmip_pad_open(phy);
if (err < 0)
- goto err1;
+ return err;
}
return 0;
-err1:
- clk_disable_unprepare(phy->pll_u);
- clk_put(phy->pll_u);
+cleanup_gpio_req:
+ gpio_free(phy->reset_gpio);
+cleanup_clk_get:
+ clk_put(phy->clk);
return err;
}

--
1.7.0.4


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