linux-kernel - Re: [PATCH v3 4/4] usb: aspeed-vhub: support test mode feature

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Message-ID: <9290cfc85fbb857f55ff297e482b06d96c807f1a.camel@kernel.crashing.org>
Date:   Thu, 09 Dec 2021 11:06:00 +1100
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Neal Liu <neal_liu@...eedtech.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Cai Huoqing <caihuoqing@...du.com>,
        Tao Ren <rentao.bupt@...il.com>,
        Julia Lawall <julia.lawall@...ia.fr>,
        kernel test robot <lkp@...el.com>,
        Sasha Levin <sashal@...nel.org>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org
Cc:     BMC-SW@...eedtech.com
Subject: Re: [PATCH v3 4/4] usb: aspeed-vhub: support test mode feature

On Wed, 2021-12-08 at 18:05 +0800, Neal Liu wrote:
> Support aspeed usb vhub set feature to test mode.
> 
> Signed-off-by: Neal Liu <neal_liu@...eedtech.com>

Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>

> ---
>  drivers/usb/gadget/udc/aspeed-vhub/dev.c | 19 +++++++++++++++----
>  drivers/usb/gadget/udc/aspeed-vhub/hub.c | 23 +++++++++++++++++-----
> -
>  2 files changed, 32 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/usb/gadget/udc/aspeed-vhub/dev.c
> b/drivers/usb/gadget/udc/aspeed-vhub/dev.c
> index d918e8b2af3c..b0dfca43fbdc 100644
> --- a/drivers/usb/gadget/udc/aspeed-vhub/dev.c
> +++ b/drivers/usb/gadget/udc/aspeed-vhub/dev.c
> @@ -110,15 +110,26 @@ static int ast_vhub_dev_feature(struct
> ast_vhub_dev *d,
>  				u16 wIndex, u16 wValue,
>  				bool is_set)
>  {
> +	u32 val;
> +
>  	DDBG(d, "%s_FEATURE(dev val=%02x)\n",
>  	     is_set ? "SET" : "CLEAR", wValue);
>  
> -	if (wValue != USB_DEVICE_REMOTE_WAKEUP)
> -		return std_req_driver;
> +	if (wValue == USB_DEVICE_REMOTE_WAKEUP) {
> +		d->wakeup_en = is_set;
> +		return std_req_complete;
> +	}
>  
> -	d->wakeup_en = is_set;
> +	if (wValue == USB_DEVICE_TEST_MODE) {
> +		val = readl(d->vhub->regs + AST_VHUB_CTRL);
> +		val &= ~GENMASK(10, 8);
> +		val |= VHUB_CTRL_SET_TEST_MODE((wIndex >> 8) & 0x7);
> +		writel(val, d->vhub->regs + AST_VHUB_CTRL);
>  
> -	return std_req_complete;
> +		return std_req_complete;
> +	}
> +
> +	return std_req_driver;
>  }
>  
>  static int ast_vhub_ep_feature(struct ast_vhub_dev *d,
> diff --git a/drivers/usb/gadget/udc/aspeed-vhub/hub.c
> b/drivers/usb/gadget/udc/aspeed-vhub/hub.c
> index 93f27a745760..65cd4e46f031 100644
> --- a/drivers/usb/gadget/udc/aspeed-vhub/hub.c
> +++ b/drivers/usb/gadget/udc/aspeed-vhub/hub.c
> @@ -212,17 +212,28 @@ static int ast_vhub_hub_dev_feature(struct
> ast_vhub_ep *ep,
>  				    u16 wIndex, u16 wValue,
>  				    bool is_set)
>  {
> +	u32 val;
> +
>  	EPDBG(ep, "%s_FEATURE(dev val=%02x)\n",
>  	      is_set ? "SET" : "CLEAR", wValue);
>  
> -	if (wValue != USB_DEVICE_REMOTE_WAKEUP)
> -		return std_req_stall;
> +	if (wValue == USB_DEVICE_REMOTE_WAKEUP) {
> +		ep->vhub->wakeup_en = is_set;
> +		EPDBG(ep, "Hub remote wakeup %s\n",
> +		      is_set ? "enabled" : "disabled");
> +		return std_req_complete;
> +	}
>  
> -	ep->vhub->wakeup_en = is_set;
> -	EPDBG(ep, "Hub remote wakeup %s\n",
> -	      is_set ? "enabled" : "disabled");
> +	if (wValue == USB_DEVICE_TEST_MODE) {
> +		val = readl(ep->vhub->regs + AST_VHUB_CTRL);
> +		val &= ~GENMASK(10, 8);
> +		val |= VHUB_CTRL_SET_TEST_MODE((wIndex >> 8) & 0x7);
> +		writel(val, ep->vhub->regs + AST_VHUB_CTRL);
>  
> -	return std_req_complete;
> +		return std_req_complete;
> +	}
> +
> +	return std_req_stall;
>  }
>  
>  static int ast_vhub_hub_ep_feature(struct ast_vhub_ep *ep,