[PATCH 0/3] usb: dwc3: xilinx: minor fixes for dwc3-xilinx glue driver

[PATCH 0/3] usb: dwc3: xilinx: minor fixes for dwc3-xilinx glue driver

[Radhey Shyam Pandey]

Minor cleanups and a bug fix for the dwc3-xilinx glue driver:

- Fix a comment style violation (missing space before closing delimiter).
- Use reset_control_reset in versal init.
- Fix phy resource leak in zynqmp init error paths where phy_init() and
  phy_power_on() resources were not properly released on failure.

Radhey Shyam Pandey (3):
  usb: dwc3: xilinx: fix missing space before closing comment delimiter
  usb: dwc3: xilinx: use reset_control_reset() in versal init
  usb: dwc3: xilinx: fix error handling in zynqmp init error paths

 drivers/usb/dwc3/dwc3-xilinx.c | 45 +++++++++++++++-------------------
 1 file changed, 20 insertions(+), 25 deletions(-)


base-commit: 5d6919055dec134de3c40167a490f33c74c12581
-- 
2.44.4

[PATCH 1/3] usb: dwc3: xilinx: fix missing space before closing comment delimiter

[Radhey Shyam Pandey]

Add missing space before '*/' in an inline comment to follow
the kernel coding style.

Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
---
 drivers/usb/dwc3/dwc3-xilinx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/dwc3-xilinx.c b/drivers/usb/dwc3/dwc3-xilinx.c
index f41b0da5e89d..a3c7dc258c7d 100644
--- a/drivers/usb/dwc3/dwc3-xilinx.c
+++ b/drivers/usb/dwc3/dwc3-xilinx.c
@@ -196,7 +196,7 @@ static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data)
 	}
 
 	if (priv_data->usb3_phy) {
-		/* Set PIPE Power Present signal in FPD Power Present Register*/
+		/* Set PIPE Power Present signal in FPD Power Present Register */
 		writel(FPD_POWER_PRSNT_OPTION, priv_data->regs + XLNX_USB_FPD_POWER_PRSNT);
 		/* Set the PIPE Clock Select bit in FPD PIPE Clock register */
 		writel(PIPE_CLK_SELECT, priv_data->regs + XLNX_USB_FPD_PIPE_CLK);
-- 
2.44.4

[PATCH 2/3] usb: dwc3: xilinx: use reset_control_reset() in versal init

[Radhey Shyam Pandey]

Replace separate reset_control_assert() and reset_control_deassert() calls
with reset_control_reset(), which pulses the reset in one step. Report
failures with dev_err_probe() and a single message. No functional change.

Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
---
 drivers/usb/dwc3/dwc3-xilinx.c | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-xilinx.c b/drivers/usb/dwc3/dwc3-xilinx.c
index a3c7dc258c7d..94458b3da1a0 100644
--- a/drivers/usb/dwc3/dwc3-xilinx.c
+++ b/drivers/usb/dwc3/dwc3-xilinx.c
@@ -98,18 +98,10 @@ static int dwc3_xlnx_init_versal(struct dwc3_xlnx *priv_data)
 
 	dwc3_xlnx_mask_phy_rst(priv_data, false);
 
-	/* Assert and De-assert reset */
-	ret = reset_control_assert(crst);
-	if (ret < 0) {
-		dev_err_probe(dev, ret, "failed to assert Reset\n");
-		return ret;
-	}
-
-	ret = reset_control_deassert(crst);
-	if (ret < 0) {
-		dev_err_probe(dev, ret, "failed to De-assert Reset\n");
-		return ret;
-	}
+	/* assert and deassert reset */
+	ret = reset_control_reset(crst);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to assert and deassert reset\n");
 
 	dwc3_xlnx_mask_phy_rst(priv_data, true);
 	dwc3_xlnx_set_coherency(priv_data, XLNX_USB2_TRAFFIC_ROUTE_CONFIG);
-- 
2.44.4

[PATCH 3/3] usb: dwc3: xilinx: fix error handling in zynqmp init error paths

[Radhey Shyam Pandey]

Fix error handling and resource cleanup i.e remove invalid
phy_exit() after failed phy_init(), route failures through
proper cleanup paths and return 0 explicitly on success.

Fixes: 84770f028fab ("usb: dwc3: Add driver for Xilinx platforms")
Cc: stable@vger.kernel.org
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
---
 drivers/usb/dwc3/dwc3-xilinx.c | 27 +++++++++++++++------------
 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-xilinx.c b/drivers/usb/dwc3/dwc3-xilinx.c
index 94458b3da1a0..b832505e1b04 100644
--- a/drivers/usb/dwc3/dwc3-xilinx.c
+++ b/drivers/usb/dwc3/dwc3-xilinx.c
@@ -176,15 +176,13 @@ static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data)
 	}
 
 	ret = phy_init(priv_data->usb3_phy);
-	if (ret < 0) {
-		phy_exit(priv_data->usb3_phy);
+	if (ret < 0)
 		goto err;
-	}
 
 	ret = reset_control_deassert(apbrst);
 	if (ret < 0) {
 		dev_err(dev, "Failed to release APB reset\n");
-		goto err;
+		goto err_phy_exit;
 	}
 
 	if (priv_data->usb3_phy) {
@@ -200,26 +198,24 @@ static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data)
 	ret = reset_control_deassert(crst);
 	if (ret < 0) {
 		dev_err(dev, "Failed to release core reset\n");
-		goto err;
+		goto err_phy_exit;
 	}
 
 	ret = reset_control_deassert(hibrst);
 	if (ret < 0) {
 		dev_err(dev, "Failed to release hibernation reset\n");
-		goto err;
+		goto err_phy_exit;
 	}
 
 	ret = phy_power_on(priv_data->usb3_phy);
-	if (ret < 0) {
-		phy_exit(priv_data->usb3_phy);
-		goto err;
-	}
+	if (ret < 0)
+		goto err_phy_exit;
 
 	/* ulpi reset via gpio-modepin or gpio-framework driver */
 	reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
 	if (IS_ERR(reset_gpio)) {
-		return dev_err_probe(dev, PTR_ERR(reset_gpio),
-				     "Failed to request reset GPIO\n");
+		ret = PTR_ERR(reset_gpio);
+		goto err_phy_power_off;
 	}
 
 	if (reset_gpio) {
@@ -229,6 +225,13 @@ static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data)
 	}
 
 	dwc3_xlnx_set_coherency(priv_data, XLNX_USB_TRAFFIC_ROUTE_CONFIG);
+
+	return 0;
+
+err_phy_power_off:
+	phy_power_off(priv_data->usb3_phy);
+err_phy_exit:
+	phy_exit(priv_data->usb3_phy);
 err:
 	return ret;
 }
-- 
2.44.4

Re: [PATCH 1/3] usb: dwc3: xilinx: fix missing space before closing comment delimiter

[Thinh Nguyen]

On Mon, May 11, 2026, Radhey Shyam Pandey wrote:
> Add missing space before '*/' in an inline comment to follow
> the kernel coding style.
> 
> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
> ---
>  drivers/usb/dwc3/dwc3-xilinx.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-xilinx.c b/drivers/usb/dwc3/dwc3-xilinx.c
> index f41b0da5e89d..a3c7dc258c7d 100644
> --- a/drivers/usb/dwc3/dwc3-xilinx.c
> +++ b/drivers/usb/dwc3/dwc3-xilinx.c
> @@ -196,7 +196,7 @@ static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data)
>  	}
>  
>  	if (priv_data->usb3_phy) {
> -		/* Set PIPE Power Present signal in FPD Power Present Register*/
> +		/* Set PIPE Power Present signal in FPD Power Present Register */
>  		writel(FPD_POWER_PRSNT_OPTION, priv_data->regs + XLNX_USB_FPD_POWER_PRSNT);
>  		/* Set the PIPE Clock Select bit in FPD PIPE Clock register */
>  		writel(PIPE_CLK_SELECT, priv_data->regs + XLNX_USB_FPD_PIPE_CLK);
> -- 
> 2.44.4
> 

Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>

BR,
Thinh

Re: [PATCH 2/3] usb: dwc3: xilinx: use reset_control_reset() in versal init

[Thinh Nguyen]

On Mon, May 11, 2026, Radhey Shyam Pandey wrote:
> Replace separate reset_control_assert() and reset_control_deassert() calls
> with reset_control_reset(), which pulses the reset in one step. Report
> failures with dev_err_probe() and a single message. No functional change.
> 

The behavior of reset_control_reset() is a little different. I wouldn't
call this "No functional change". However, I assumed this was tested.
Please provide a proper reason for this change in the change log.

> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
> ---
>  drivers/usb/dwc3/dwc3-xilinx.c | 16 ++++------------
>  1 file changed, 4 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-xilinx.c b/drivers/usb/dwc3/dwc3-xilinx.c
> index a3c7dc258c7d..94458b3da1a0 100644
> --- a/drivers/usb/dwc3/dwc3-xilinx.c
> +++ b/drivers/usb/dwc3/dwc3-xilinx.c
> @@ -98,18 +98,10 @@ static int dwc3_xlnx_init_versal(struct dwc3_xlnx *priv_data)
>  
>  	dwc3_xlnx_mask_phy_rst(priv_data, false);
>  
> -	/* Assert and De-assert reset */
> -	ret = reset_control_assert(crst);
> -	if (ret < 0) {
> -		dev_err_probe(dev, ret, "failed to assert Reset\n");
> -		return ret;
> -	}
> -
> -	ret = reset_control_deassert(crst);
> -	if (ret < 0) {
> -		dev_err_probe(dev, ret, "failed to De-assert Reset\n");
> -		return ret;
> -	}
> +	/* assert and deassert reset */
> +	ret = reset_control_reset(crst);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "failed to assert and deassert reset\n");
>  
>  	dwc3_xlnx_mask_phy_rst(priv_data, true);
>  	dwc3_xlnx_set_coherency(priv_data, XLNX_USB2_TRAFFIC_ROUTE_CONFIG);
> -- 
> 2.44.4
> 

Re: [PATCH 3/3] usb: dwc3: xilinx: fix error handling in zynqmp init error paths

[Thinh Nguyen]

On Mon, May 11, 2026, Radhey Shyam Pandey wrote:
> Fix error handling and resource cleanup i.e remove invalid
> phy_exit() after failed phy_init(), route failures through
> proper cleanup paths and return 0 explicitly on success.
> 
> Fixes: 84770f028fab ("usb: dwc3: Add driver for Xilinx platforms")
> Cc: stable@vger.kernel.org
> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
> ---
>  drivers/usb/dwc3/dwc3-xilinx.c | 27 +++++++++++++++------------
>  1 file changed, 15 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-xilinx.c b/drivers/usb/dwc3/dwc3-xilinx.c
> index 94458b3da1a0..b832505e1b04 100644
> --- a/drivers/usb/dwc3/dwc3-xilinx.c
> +++ b/drivers/usb/dwc3/dwc3-xilinx.c
> @@ -176,15 +176,13 @@ static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data)
>  	}
>  
>  	ret = phy_init(priv_data->usb3_phy);
> -	if (ret < 0) {
> -		phy_exit(priv_data->usb3_phy);
> +	if (ret < 0)
>  		goto err;
> -	}
>  
>  	ret = reset_control_deassert(apbrst);
>  	if (ret < 0) {
>  		dev_err(dev, "Failed to release APB reset\n");
> -		goto err;
> +		goto err_phy_exit;
>  	}
>  
>  	if (priv_data->usb3_phy) {
> @@ -200,26 +198,24 @@ static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data)
>  	ret = reset_control_deassert(crst);
>  	if (ret < 0) {
>  		dev_err(dev, "Failed to release core reset\n");
> -		goto err;
> +		goto err_phy_exit;
>  	}
>  
>  	ret = reset_control_deassert(hibrst);
>  	if (ret < 0) {
>  		dev_err(dev, "Failed to release hibernation reset\n");
> -		goto err;
> +		goto err_phy_exit;
>  	}
>  
>  	ret = phy_power_on(priv_data->usb3_phy);
> -	if (ret < 0) {
> -		phy_exit(priv_data->usb3_phy);
> -		goto err;
> -	}
> +	if (ret < 0)
> +		goto err_phy_exit;
>  
>  	/* ulpi reset via gpio-modepin or gpio-framework driver */
>  	reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
>  	if (IS_ERR(reset_gpio)) {
> -		return dev_err_probe(dev, PTR_ERR(reset_gpio),
> -				     "Failed to request reset GPIO\n");
> +		ret = PTR_ERR(reset_gpio);
> +		goto err_phy_power_off;
>  	}
>  
>  	if (reset_gpio) {
> @@ -229,6 +225,13 @@ static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data)
>  	}
>  
>  	dwc3_xlnx_set_coherency(priv_data, XLNX_USB_TRAFFIC_ROUTE_CONFIG);
> +
> +	return 0;
> +
> +err_phy_power_off:
> +	phy_power_off(priv_data->usb3_phy);
> +err_phy_exit:
> +	phy_exit(priv_data->usb3_phy);
>  err:
>  	return ret;
>  }
> -- 
> 2.44.4
> 

This fix should be a separate patch from this cleanup series.

Thanks,
Thinh