linux-kernel - Re: [PATCH v1 3/3] usb: dwc3: gadget: Skip endpoints ep[18]{in,out} on Intel Merrifield

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Message-ID: <20250116233937.s7mv5mu4tfuaexy2@synopsys.com>
Date: Thu, 16 Jan 2025 23:39:42 +0000
From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Felipe Balbi <balbi@...nel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, Ferry Toth <fntoth@...il.com>
Subject: Re: [PATCH v1 3/3] usb: dwc3: gadget: Skip endpoints ep[18]{in,out}
 on Intel Merrifield

On Thu, Jan 16, 2025, Andy Shevchenko wrote:
> Intel Merrifield SoC uses these endpoints for tracing and they shouldn't
> be used for normal transfers, we need to skip them.
> 
> • 1 High BW Bulk IN (IN#1) (RTIT)
> • 1 1KB BW Bulk IN (IN#8) + 1 1KB BW Bulk OUT (Run Control) (OUT#8)
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/usb/dwc3/dwc3-pci.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
> index 052852f80146..9b73dfd34823 100644
> --- a/drivers/usb/dwc3/dwc3-pci.c
> +++ b/drivers/usb/dwc3/dwc3-pci.c
> @@ -148,11 +148,20 @@ static const struct property_entry dwc3_pci_intel_byt_properties[] = {
>  	{}
>  };
>  
> +/*
> + * Intel Merrifield uses these endpoints for tracing and they shouldn't be used
> + * for normal transfers, we need to skip them.
> + * • 1 High BW Bulk IN (IN#1) (RTIT)
> + * • 1 1KB BW Bulk IN (IN#8) + 1 1KB BW Bulk OUT (Run Control) (OUT#8)

Please use regular bullet character and list the endpoint per line.

BR,
Thinh

> + */
> +static const u8 dwc3_pci_mrfld_reserved_endpoints[] = { 3, 16, 17 };
> +
>  static const struct property_entry dwc3_pci_mrfld_properties[] = {
>  	PROPERTY_ENTRY_STRING("dr_mode", "otg"),
>  	PROPERTY_ENTRY_STRING("linux,extcon-name", "mrfld_bcove_pwrsrc"),
>  	PROPERTY_ENTRY_BOOL("snps,dis_u3_susphy_quirk"),
>  	PROPERTY_ENTRY_BOOL("snps,dis_u2_susphy_quirk"),
> +	PROPERTY_ENTRY_U8_ARRAY("snps,reserved-endpoints", dwc3_pci_mrfld_reserved_endpoints),
>  	PROPERTY_ENTRY_BOOL("snps,usb2-gadget-lpm-disable"),
>  	PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
>  	{}
> -- 
> 2.43.0.rc1.1336.g36b5255a03ac
>