* [PATCH] usb: dwc3: st: Propagate reset deassert failures
@ 2026-06-24 5:57 Pengpeng Hou
2026-06-25 15:34 ` Patrice CHOTARD
2026-06-26 22:07 ` Thinh Nguyen
0 siblings, 2 replies; 3+ messages in thread
From: Pengpeng Hou @ 2026-06-24 5:57 UTC (permalink / raw)
To: Patrice Chotard, Thinh Nguyen, Greg Kroah-Hartman, Philipp Zabel
Cc: linux-arm-kernel, linux-usb, linux-kernel, Pengpeng Hou
The ST DWC3 glue driver treats the powerdown and softreset reset
controls as required resources, but ignores reset_control_deassert()
failures before populating the child DWC3 device. Resume ignores the
same failures before returning success.
Check the deassert operations and unwind the already deasserted
powerdown reset if softreset deassertion fails.
Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
---
drivers/usb/dwc3/dwc3-st.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/dwc3/dwc3-st.c b/drivers/usb/dwc3/dwc3-st.c
index 5d513decaacd..bbabfd933798 100644
--- a/drivers/usb/dwc3/dwc3-st.c
+++ b/drivers/usb/dwc3/dwc3-st.c
@@ -242,7 +242,9 @@ static int st_dwc3_probe(struct platform_device *pdev)
"could not get power controller\n");
/* Manage PowerDown */
- reset_control_deassert(dwc3_data->rstc_pwrdn);
+ ret = reset_control_deassert(dwc3_data->rstc_pwrdn);
+ if (ret)
+ return ret;
dwc3_data->rstc_rst =
devm_reset_control_get_shared(dev, "softreset");
@@ -253,7 +255,9 @@ static int st_dwc3_probe(struct platform_device *pdev)
}
/* Manage SoftReset */
- reset_control_deassert(dwc3_data->rstc_rst);
+ ret = reset_control_deassert(dwc3_data->rstc_rst);
+ if (ret)
+ goto undo_powerdown;
/* Allocate and initialize the core */
ret = of_platform_populate(node, NULL, NULL, dev);
@@ -328,8 +332,15 @@ static int st_dwc3_resume(struct device *dev)
pinctrl_pm_select_default_state(dev);
- reset_control_deassert(dwc3_data->rstc_pwrdn);
- reset_control_deassert(dwc3_data->rstc_rst);
+ ret = reset_control_deassert(dwc3_data->rstc_pwrdn);
+ if (ret)
+ return ret;
+
+ ret = reset_control_deassert(dwc3_data->rstc_rst);
+ if (ret) {
+ reset_control_assert(dwc3_data->rstc_pwrdn);
+ return ret;
+ }
ret = st_dwc3_drd_init(dwc3_data);
if (ret) {
--
2.50.1 (Apple Git-155)
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] usb: dwc3: st: Propagate reset deassert failures
2026-06-24 5:57 [PATCH] usb: dwc3: st: Propagate reset deassert failures Pengpeng Hou
@ 2026-06-25 15:34 ` Patrice CHOTARD
2026-06-26 22:07 ` Thinh Nguyen
1 sibling, 0 replies; 3+ messages in thread
From: Patrice CHOTARD @ 2026-06-25 15:34 UTC (permalink / raw)
To: Pengpeng Hou, Thinh Nguyen, Greg Kroah-Hartman, Philipp Zabel
Cc: linux-arm-kernel, linux-usb, linux-kernel
On 6/24/26 07:57, Pengpeng Hou wrote:
> The ST DWC3 glue driver treats the powerdown and softreset reset
> controls as required resources, but ignores reset_control_deassert()
> failures before populating the child DWC3 device. Resume ignores the
> same failures before returning success.
>
> Check the deassert operations and unwind the already deasserted
> powerdown reset if softreset deassertion fails.
>
> Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
> ---
> drivers/usb/dwc3/dwc3-st.c | 19 +++++++++++++++----
> 1 file changed, 15 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/usb/dwc3/dwc3-st.c b/drivers/usb/dwc3/dwc3-st.c
> index 5d513decaacd..bbabfd933798 100644
> --- a/drivers/usb/dwc3/dwc3-st.c
> +++ b/drivers/usb/dwc3/dwc3-st.c
> @@ -242,7 +242,9 @@ static int st_dwc3_probe(struct platform_device *pdev)
> "could not get power controller\n");
>
> /* Manage PowerDown */
> - reset_control_deassert(dwc3_data->rstc_pwrdn);
> + ret = reset_control_deassert(dwc3_data->rstc_pwrdn);
> + if (ret)
> + return ret;
>
> dwc3_data->rstc_rst =
> devm_reset_control_get_shared(dev, "softreset");
> @@ -253,7 +255,9 @@ static int st_dwc3_probe(struct platform_device *pdev)
> }
>
> /* Manage SoftReset */
> - reset_control_deassert(dwc3_data->rstc_rst);
> + ret = reset_control_deassert(dwc3_data->rstc_rst);
> + if (ret)
> + goto undo_powerdown;
>
> /* Allocate and initialize the core */
> ret = of_platform_populate(node, NULL, NULL, dev);
> @@ -328,8 +332,15 @@ static int st_dwc3_resume(struct device *dev)
>
> pinctrl_pm_select_default_state(dev);
>
> - reset_control_deassert(dwc3_data->rstc_pwrdn);
> - reset_control_deassert(dwc3_data->rstc_rst);
> + ret = reset_control_deassert(dwc3_data->rstc_pwrdn);
> + if (ret)
> + return ret;
> +
> + ret = reset_control_deassert(dwc3_data->rstc_rst);
> + if (ret) {
> + reset_control_assert(dwc3_data->rstc_pwrdn);
> + return ret;
> + }
>
> ret = st_dwc3_drd_init(dwc3_data);
> if (ret) {
Hi Pengpeng
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Thanks
Patrice
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] usb: dwc3: st: Propagate reset deassert failures
2026-06-24 5:57 [PATCH] usb: dwc3: st: Propagate reset deassert failures Pengpeng Hou
2026-06-25 15:34 ` Patrice CHOTARD
@ 2026-06-26 22:07 ` Thinh Nguyen
1 sibling, 0 replies; 3+ messages in thread
From: Thinh Nguyen @ 2026-06-26 22:07 UTC (permalink / raw)
To: Pengpeng Hou
Cc: Patrice Chotard, Thinh Nguyen, Greg Kroah-Hartman, Philipp Zabel,
linux-arm-kernel@lists.infradead.org, linux-usb@vger.kernel.org,
linux-kernel@vger.kernel.org
On Wed, Jun 24, 2026, Pengpeng Hou wrote:
> The ST DWC3 glue driver treats the powerdown and softreset reset
> controls as required resources, but ignores reset_control_deassert()
> failures before populating the child DWC3 device. Resume ignores the
> same failures before returning success.
>
> Check the deassert operations and unwind the already deasserted
> powerdown reset if softreset deassertion fails.
>
> Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
> ---
> drivers/usb/dwc3/dwc3-st.c | 19 +++++++++++++++----
> 1 file changed, 15 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/usb/dwc3/dwc3-st.c b/drivers/usb/dwc3/dwc3-st.c
> index 5d513decaacd..bbabfd933798 100644
> --- a/drivers/usb/dwc3/dwc3-st.c
> +++ b/drivers/usb/dwc3/dwc3-st.c
> @@ -242,7 +242,9 @@ static int st_dwc3_probe(struct platform_device *pdev)
> "could not get power controller\n");
>
> /* Manage PowerDown */
> - reset_control_deassert(dwc3_data->rstc_pwrdn);
> + ret = reset_control_deassert(dwc3_data->rstc_pwrdn);
> + if (ret)
> + return ret;
>
> dwc3_data->rstc_rst =
> devm_reset_control_get_shared(dev, "softreset");
> @@ -253,7 +255,9 @@ static int st_dwc3_probe(struct platform_device *pdev)
> }
>
> /* Manage SoftReset */
> - reset_control_deassert(dwc3_data->rstc_rst);
> + ret = reset_control_deassert(dwc3_data->rstc_rst);
> + if (ret)
> + goto undo_powerdown;
This should goto undo_softreset instead of undo_powerdown.
BR,
Thinh
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2026-06-26 22:08 UTC | newest]
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2026-06-24 5:57 [PATCH] usb: dwc3: st: Propagate reset deassert failures Pengpeng Hou
2026-06-25 15:34 ` Patrice CHOTARD
2026-06-26 22:07 ` Thinh Nguyen
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