From 09a3512681b359d7d18d1ff999831b0c63decdae Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Sun, 13 Feb 2022 14:05:21 +0100 Subject: phy: ti: tusb1210: Improve ulpi_read()/_write() error checking 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 Link: https://lore.kernel.org/r/20220213130524.18748-7-hdegoede@redhat.com Signed-off-by: Vinod Koul --- drivers/phy/ti/phy-tusb1210.c | 62 +++++++++++++++++++++++++++++++++---------- 1 file changed, 48 insertions(+), 14 deletions(-) (limited to 'drivers/phy') diff --git a/drivers/phy/ti/phy-tusb1210.c b/drivers/phy/ti/phy-tusb1210.c index 15c1c79e5c29..bf7793afdc84 100644 --- a/drivers/phy/ti/phy-tusb1210.c +++ b/drivers/phy/ti/phy-tusb1210.c @@ -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, ®); 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, ®); + 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(®, 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; -- cgit v1.2.3