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usb: dwc3: xilinx: fix usb3 non-wakeup source resume failure

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When USB is in super-speed mode and disabled as a wakeup source,
observed that on the resume path, lanes have not been configured
properly in the phy-zynqmp driver.
As a result, after the resume, USB device detection failed on host.

To resolved the above issue, added phy_init on resume and phy_exit
on suspend path, to configure the GT lanes correctly.
The re-initialization of phy, reset the device and re-enumerate
the USB subsystem.

This use-case is specific to Xilinx ZynqMP SoC.

Signed-off-by: Piyush Mehta <piyush.mehta@amd.com>
Link: https://lore.kernel.org/r/20220912111017.901321-3-piyush.mehta@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Piyush Mehta 2022-09-12 16:40:17 +05:30 committed by Greg Kroah-Hartman
parent ec50e11438
commit d6edcdc1ef
1 changed files with 21 additions and 9 deletions
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30
drivers/usb/dwc3/dwc3-xilinx.c
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@ -47,6 +47,7 @@ struct dwc3_xlnx {
struct device *dev;
void __iomem *regs;
int (*pltfm_init)(struct dwc3_xlnx *data);
struct phy *usb3_phy;
};
static void dwc3_xlnx_mask_phy_rst(struct dwc3_xlnx *priv_data, bool mask)
@ -100,13 +101,12 @@ static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data)
struct device *dev = priv_data->dev;
struct reset_control *crst, *hibrst, *apbrst;
struct gpio_desc *reset_gpio;
struct phy *usb3_phy;
int ret = 0;
u32 reg;
usb3_phy = devm_phy_optional_get(dev, "usb3-phy");
if (IS_ERR(usb3_phy)) {
ret = PTR_ERR(usb3_phy);
priv_data->usb3_phy = devm_phy_optional_get(dev, "usb3-phy");
if (IS_ERR(priv_data->usb3_phy)) {
ret = PTR_ERR(priv_data->usb3_phy);
dev_err_probe(dev, ret,
"failed to get USB3 PHY\n");
goto err;
@ -121,7 +121,7 @@ static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data)
* in use but the usb3-phy entry is missing from the device tree.
* Therefore, skip these operations in this case.
*/
if (!usb3_phy)
if (!priv_data->usb3_phy)
goto skip_usb3_phy;
crst = devm_reset_control_get_exclusive(dev, "usb_crst");
@ -166,9 +166,9 @@ static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data)
goto err;
}
ret = phy_init(usb3_phy);
ret = phy_init(priv_data->usb3_phy);
if (ret < 0) {
phy_exit(usb3_phy);
phy_exit(priv_data->usb3_phy);
goto err;
}
@ -196,9 +196,9 @@ static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data)
goto err;
}
ret = phy_power_on(usb3_phy);
ret = phy_power_on(priv_data->usb3_phy);
if (ret < 0) {
phy_exit(usb3_phy);
phy_exit(priv_data->usb3_phy);
goto err;
}
@ -350,6 +350,8 @@ static int __maybe_unused dwc3_xlnx_suspend(struct device *dev)
{
struct dwc3_xlnx *priv_data = dev_get_drvdata(dev);
phy_exit(priv_data->usb3_phy);
/* Disable the clocks */
clk_bulk_disable(priv_data->num_clocks, priv_data->clks);
@ -365,6 +367,16 @@ static int __maybe_unused dwc3_xlnx_resume(struct device *dev)
if (ret)
return ret;
ret = phy_init(priv_data->usb3_phy);
if (ret < 0)
return ret;
ret = phy_power_on(priv_data->usb3_phy);
if (ret < 0) {
phy_exit(priv_data->usb3_phy);
return ret;
}
return 0;
}