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Date:   Mon, 7 Sep 2020 15:06:31 +0200
From:   Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
To:     Felipe Balbi <balbi@kernel.org>,
        "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>
Cc:     Yu Chen <chenyu56@huawei.com>, <linux-usb@vger.kernel.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <john.stultz@linaro.org>, <suzhuangluan@hisilicon.com>,
        <kongfei@hisilicon.com>, <liuyu712@hisilicon.com>,
        <wanghu17@hisilicon.com>, <butao@hisilicon.com>,
        <chenyao11@huawei.com>, <fangshengzhou@hisilicon.com>,
        <lipengcheng8@huawei.com>, <songxiaowei@hisilicon.com>,
        <xuyiping@hisilicon.com>, <xuyoujun4@huawei.com>,
        <yudongbin@hisilicon.com>, <zangleigang@hisilicon.com>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        Binghui Wang <wangbinghui@hisilicon.com>
Subject: Re: [PATCH v6 04/13] usb: dwc3: Add splitdisable quirk for
 Hisilicon Kirin Soc
Message-ID: <20200907150631.70e1bce0@coco.lan>
In-Reply-To: <20190420064019.57522-5-chenyu56@huawei.com>
References: <20190420064019.57522-1-chenyu56@huawei.com>
        <20190420064019.57522-5-chenyu56@huawei.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Hi Felipe/Greg,

What's the status of this patch? 

I tested here, together with the Hikey 970 phy RFC patches I sent
last week.

Without this patch, the USB HID driver receives -EPROTO from
submitted URBs, causing it to enter into an endless reset cycle
on every 500 ms, at the hid_io_error() logic.

Tested-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

If you prefer, I can re-submit this one with my SOB.

Thanks,
Mauro

Em Sat, 20 Apr 2019 14:40:10 +0800
Yu Chen <chenyu56@huawei.com> escreveu:

> SPLIT_BOUNDARY_DISABLE should be set for DesignWare USB3 DRD Core
> of Hisilicon Kirin Soc when dwc3 core act as host.
> 
> Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
> Cc: Felipe Balbi <balbi@kernel.org>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: John Stultz <john.stultz@linaro.org>
> Cc: Binghui Wang <wangbinghui@hisilicon.com>
> Signed-off-by: Yu Chen <chenyu56@huawei.com>
> ---
> v4:
> * Add dwc3_complete definition while CONFIG_PM_SLEEP does not defined.
> * Add description for 'dis_split_quirk'.
> ---
> ---
>  drivers/usb/dwc3/core.c | 26 ++++++++++++++++++++++++++
>  drivers/usb/dwc3/core.h |  7 +++++++
>  2 files changed, 33 insertions(+)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index a1b126f90261..c3ef6bd2b0d4 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -117,6 +117,7 @@ static void __dwc3_set_mode(struct work_struct *work)
>  	struct dwc3 *dwc = work_to_dwc(work);
>  	unsigned long flags;
>  	int ret;
> +	u32 reg;
>  
>  	if (dwc->dr_mode != USB_DR_MODE_OTG)
>  		return;
> @@ -169,6 +170,11 @@ static void __dwc3_set_mode(struct work_struct *work)
>  			phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
>  			phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
>  			phy_calibrate(dwc->usb2_generic_phy);
> +			if (dwc->dis_split_quirk) {
> +				reg = dwc3_readl(dwc->regs, DWC3_GUCTL3);
> +				reg |= DWC3_GUCTL3_SPLITDISABLE;
> +				dwc3_writel(dwc->regs, DWC3_GUCTL3, reg);
> +			}
>  		}
>  		break;
>  	case DWC3_GCTL_PRTCAP_DEVICE:
> @@ -1306,6 +1312,9 @@ static void dwc3_get_properties(struct dwc3 *dwc)
>  	dwc->dis_metastability_quirk = device_property_read_bool(dev,
>  				"snps,dis_metastability_quirk");
>  
> +	dwc->dis_split_quirk = device_property_read_bool(dev,
> +				"snps,dis-split-quirk");
> +
>  	dwc->lpm_nyet_threshold = lpm_nyet_threshold;
>  	dwc->tx_de_emphasis = tx_de_emphasis;
>  
> @@ -1825,10 +1834,27 @@ static int dwc3_resume(struct device *dev)
>  
>  	return 0;
>  }
> +
> +static void dwc3_complete(struct device *dev)
> +{
> +	struct dwc3	*dwc = dev_get_drvdata(dev);
> +	u32		reg;
> +
> +	if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST &&
> +			dwc->dis_split_quirk) {
> +		dev_dbg(dwc->dev, "set DWC3_GUCTL3_SPLITDISABLE\n");
> +		reg = dwc3_readl(dwc->regs, DWC3_GUCTL3);
> +		reg |= DWC3_GUCTL3_SPLITDISABLE;
> +		dwc3_writel(dwc->regs, DWC3_GUCTL3, reg);
> +	}
> +}
> +#else
> +#define dwc3_complete NULL
>  #endif /* CONFIG_PM_SLEEP */
>  
>  static const struct dev_pm_ops dwc3_dev_pm_ops = {
>  	SET_SYSTEM_SLEEP_PM_OPS(dwc3_suspend, dwc3_resume)
> +	.complete = dwc3_complete,
>  	SET_RUNTIME_PM_OPS(dwc3_runtime_suspend, dwc3_runtime_resume,
>  			dwc3_runtime_idle)
>  };
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 1528d395b156..28475e301ad9 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -136,6 +136,7 @@
>  #define DWC3_GEVNTCOUNT(n)	(0xc40c + ((n) * 0x10))
>  
>  #define DWC3_GHWPARAMS8		0xc600
> +#define DWC3_GUCTL3		0xc60c
>  #define DWC3_GFLADJ		0xc630
>  
>  /* Device Registers */
> @@ -370,6 +371,9 @@
>  /* Global User Control Register 2 */
>  #define DWC3_GUCTL2_RST_ACTBITLATER		BIT(14)
>  
> +/* Global User Control Register 3 */
> +#define DWC3_GUCTL3_SPLITDISABLE		BIT(14)
> +
>  /* Device Configuration Register */
>  #define DWC3_DCFG_DEVADDR(addr)	((addr) << 3)
>  #define DWC3_DCFG_DEVADDR_MASK	DWC3_DCFG_DEVADDR(0x7f)
> @@ -1030,6 +1034,7 @@ struct dwc3_scratchpad_array {
>   * 	2	- No de-emphasis
>   * 	3	- Reserved
>   * @dis_metastability_quirk: set to disable metastability quirk.
> + * @dis_split_quirk: set to disable split boundary.
>   * @imod_interval: set the interrupt moderation interval in 250ns
>   *                 increments or 0 to disable.
>   */
> @@ -1216,6 +1221,8 @@ struct dwc3 {
>  
>  	unsigned		dis_metastability_quirk:1;
>  
> +	unsigned		dis_split_quirk:1;
> +
>  	u16			imod_interval;
>  };
>  


Thanks,
Mauro