On 5/5/23 21:15, Christophe JAILLET wrote:
> dwc2_driver_probe() calls dwc2_lowlevel_hw_init() which deassert some reset
> lines.
> Should an error happen in dwc2_lowlevel_hw_init() after calling
> reset_control_deassert() or in the probe after calling
> dwc2_lowlevel_hw_init(), the reset lines remain deasserted.
>
> Add some devm_add_action_or_reset() calls to re-assert the lines if needed.
>
> Update the remove function accordingly.
>
> This change is compile-tested only.
>
> Fixes: 83f8da562f8b ("usb: dwc2: Add reset control to dwc2")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Acked-by: Minas Harutyunyan <Minas.Harutyunyan@xxxxxxxxxxxx>
> ---
> drivers/usb/dwc2/platform.c | 16 +++++++++++++---
> 1 file changed, 13 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
> index 5aee284018c0..5cf025511cce 100644
> --- a/drivers/usb/dwc2/platform.c
> +++ b/drivers/usb/dwc2/platform.c
> @@ -203,6 +203,11 @@ int dwc2_lowlevel_hw_disable(struct dwc2_hsotg *hsotg)
> return ret;
> }
>
> +static void dwc2_reset_control_assert(void *data)
> +{
> + reset_control_assert(data);
> +}
> +
> static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)
> {
> int i, ret;
> @@ -213,6 +218,10 @@ static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)
> "error getting reset control\n");
>
> reset_control_deassert(hsotg->reset);
> + ret = devm_add_action_or_reset(hsotg->dev, dwc2_reset_control_assert,
> + hsotg->reset);
> + if (ret)
> + return ret;
>
> hsotg->reset_ecc = devm_reset_control_get_optional(hsotg->dev, "dwc2-ecc");
> if (IS_ERR(hsotg->reset_ecc))
> @@ -220,6 +229,10 @@ static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)
> "error getting reset control for ecc\n");
>
> reset_control_deassert(hsotg->reset_ecc);
> + ret = devm_add_action_or_reset(hsotg->dev, dwc2_reset_control_assert,
> + hsotg->reset_ecc);
> + if (ret)
> + return ret;
>
> /*
> * Attempt to find a generic PHY, then look for an old style
> @@ -339,9 +352,6 @@ static int dwc2_driver_remove(struct platform_device *dev)
> if (hsotg->ll_hw_enabled)
> dwc2_lowlevel_hw_disable(hsotg);
>
> - reset_control_assert(hsotg->reset);
> - reset_control_assert(hsotg->reset_ecc);
> -
> return 0;
> }
>
