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phy: ti: tusb1210: Improve ulpi_read()/_write() error checking

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ulpi_read() and ulpi_write() calls can fail. Add wrapper functions to log
errors when this happens and add error checking to the read + write of
the phy parameters from the TUSB1210_VENDOR_SPECIFIC2 register.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20220213130524.18748-7-hdegoede@redhat.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Hans de Goede 2022-02-13 14:05:21 +01:00 committed by Vinod Koul
parent 3153fa38e3
commit 09a3512681
1 changed files with 48 additions and 14 deletions
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62
drivers/phy/ti/phy-tusb1210.c
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@ -26,6 +26,33 @@ struct tusb1210 {
u8 vendor_specific2;
};
static int tusb1210_ulpi_write(struct tusb1210 *tusb, u8 reg, u8 val)
{
int ret;
ret = ulpi_write(tusb->ulpi, reg, val);
if (ret)
dev_err(&tusb->ulpi->dev, "error %d writing val 0x%02x to reg 0x%02x\n",
ret, val, reg);
return ret;
}
static int tusb1210_ulpi_read(struct tusb1210 *tusb, u8 reg, u8 *val)
{
int ret;
ret = ulpi_read(tusb->ulpi, reg);
if (ret >= 0) {
*val = ret;
ret = 0;
} else {
dev_err(&tusb->ulpi->dev, "error %d reading reg 0x%02x\n", ret, reg);
}
return ret;
}
static int tusb1210_power_on(struct phy *phy)
{
struct tusb1210 *tusb = phy_get_drvdata(phy);
@ -35,8 +62,8 @@ static int tusb1210_power_on(struct phy *phy)
/* Restore the optional eye diagram optimization value */
if (tusb->vendor_specific2)
ulpi_write(tusb->ulpi, TUSB1210_VENDOR_SPECIFIC2,
tusb->vendor_specific2);
return tusb1210_ulpi_write(tusb, TUSB1210_VENDOR_SPECIFIC2,
tusb->vendor_specific2);
return 0;
}
@ -55,33 +82,34 @@ static int tusb1210_set_mode(struct phy *phy, enum phy_mode mode, int submode)
{
struct tusb1210 *tusb = phy_get_drvdata(phy);
int ret;
u8 reg;
ret = ulpi_read(tusb->ulpi, ULPI_OTG_CTRL);
ret = tusb1210_ulpi_read(tusb, ULPI_OTG_CTRL, &reg);
if (ret < 0)
return ret;
switch (mode) {
case PHY_MODE_USB_HOST:
ret |= (ULPI_OTG_CTRL_DRVVBUS_EXT
reg |= (ULPI_OTG_CTRL_DRVVBUS_EXT
| ULPI_OTG_CTRL_ID_PULLUP
| ULPI_OTG_CTRL_DP_PULLDOWN
| ULPI_OTG_CTRL_DM_PULLDOWN);
ulpi_write(tusb->ulpi, ULPI_OTG_CTRL, ret);
ret |= ULPI_OTG_CTRL_DRVVBUS;
tusb1210_ulpi_write(tusb, ULPI_OTG_CTRL, reg);
reg |= ULPI_OTG_CTRL_DRVVBUS;
break;
case PHY_MODE_USB_DEVICE:
ret &= ~(ULPI_OTG_CTRL_DRVVBUS
reg &= ~(ULPI_OTG_CTRL_DRVVBUS
| ULPI_OTG_CTRL_DP_PULLDOWN
| ULPI_OTG_CTRL_DM_PULLDOWN);
ulpi_write(tusb->ulpi, ULPI_OTG_CTRL, ret);
ret &= ~ULPI_OTG_CTRL_DRVVBUS_EXT;
tusb1210_ulpi_write(tusb, ULPI_OTG_CTRL, reg);
reg &= ~ULPI_OTG_CTRL_DRVVBUS_EXT;
break;
default:
/* nothing */
return 0;
}
return ulpi_write(tusb->ulpi, ULPI_OTG_CTRL, ret);
return tusb1210_ulpi_write(tusb, ULPI_OTG_CTRL, reg);
}
static const struct phy_ops phy_ops = {
@ -95,11 +123,14 @@ static int tusb1210_probe(struct ulpi *ulpi)
{
struct tusb1210 *tusb;
u8 val, reg;
int ret;
tusb = devm_kzalloc(&ulpi->dev, sizeof(*tusb), GFP_KERNEL);
if (!tusb)
return -ENOMEM;
tusb->ulpi = ulpi;
tusb->gpio_reset = devm_gpiod_get_optional(&ulpi->dev, "reset",
GPIOD_OUT_LOW);
if (IS_ERR(tusb->gpio_reset))
@ -119,7 +150,9 @@ static int tusb1210_probe(struct ulpi *ulpi)
* diagram optimization and DP/DM swap.
*/
reg = ulpi_read(ulpi, TUSB1210_VENDOR_SPECIFIC2);
ret = tusb1210_ulpi_read(tusb, TUSB1210_VENDOR_SPECIFIC2, &reg);
if (ret)
return ret;
/* High speed output drive strength configuration */
if (!device_property_read_u8(&ulpi->dev, "ihstx", &val))
@ -133,15 +166,16 @@ static int tusb1210_probe(struct ulpi *ulpi)
if (!device_property_read_u8(&ulpi->dev, "datapolarity", &val))
u8p_replace_bits(&reg, val, (u8)TUSB1210_VENDOR_SPECIFIC2_DP_MASK);
ulpi_write(ulpi, TUSB1210_VENDOR_SPECIFIC2, reg);
ret = tusb1210_ulpi_write(tusb, TUSB1210_VENDOR_SPECIFIC2, reg);
if (ret)
return ret;
tusb->vendor_specific2 = reg;
tusb->phy = ulpi_phy_create(ulpi, &phy_ops);
if (IS_ERR(tusb->phy))
return PTR_ERR(tusb->phy);
tusb->ulpi = ulpi;
phy_set_drvdata(tusb->phy, tusb);
ulpi_set_drvdata(ulpi, tusb);
return 0;