Re: [RFC][PATCH v2 2/5] usb: dwc3: Execute GCTL Core Soft Reset while switch mdoe for Hisilicon Kirin Soc

[Jack Pham <jackp@codeaurora.org>]

Hi John, Yu, Felipe,

On Mon, Oct 07, 2019 at 05:55:50PM +0000, John Stultz wrote:
> From: Yu Chen <chenyu56@huawei.com>
> 
> A GCTL soft reset should be executed when switch mode for dwc3 core
> of Hisilicon Kirin Soc.
> 
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Felipe Balbi <balbi@kernel.org>
> Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Yu Chen <chenyu56@huawei.com>
> Cc: Matthias Brugger <matthias.bgg@gmail.com>
> Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
> Cc: linux-usb@vger.kernel.org
> Cc: devicetree@vger.kernel.org
> Signed-off-by: Yu Chen <chenyu56@huawei.com>
> Signed-off-by: John Stultz <john.stultz@linaro.org>
> ---
>  drivers/usb/dwc3/core.c | 20 ++++++++++++++++++++
>  drivers/usb/dwc3/core.h |  3 +++
>  2 files changed, 23 insertions(+)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 999ce5e84d3c..440261432421 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -112,6 +112,19 @@ void dwc3_set_prtcap(struct dwc3 *dwc, u32 mode)
>  	dwc->current_dr_role = mode;
>  }
>  
> +static void dwc3_gctl_core_soft_reset(struct dwc3 *dwc)
> +{
> +	u32 reg;
> +
> +	reg = dwc3_readl(dwc->regs, DWC3_GCTL);
> +	reg |= DWC3_GCTL_CORESOFTRESET;
> +	dwc3_writel(dwc->regs, DWC3_GCTL, reg);
> +
> +	reg = dwc3_readl(dwc->regs, DWC3_GCTL);
> +	reg &= ~DWC3_GCTL_CORESOFTRESET;
> +	dwc3_writel(dwc->regs, DWC3_GCTL, reg);
> +}
> +
>  static void __dwc3_set_mode(struct work_struct *work)
>  {
>  	struct dwc3 *dwc = work_to_dwc(work);
> @@ -156,6 +169,10 @@ static void __dwc3_set_mode(struct work_struct *work)
>  
>  	dwc3_set_prtcap(dwc, dwc->desired_dr_role);
>  
> +	/* Execute a GCTL Core Soft Reset when switch mode */
> +	if (dwc->gctl_reset_quirk)
> +		dwc3_gctl_core_soft_reset(dwc);
> +

In fact it is mentioned in the Synopsys databook to perform a GCTL
CoreSoftReset when changing the PrtCapDir between device & host modes.
So I think this should apply generally without a quirk. Further, it
states to do this *prior* to writing PrtCapDir, so should it go before
dwc3_set_prtcap() instead?

Jack
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