linux-kernel - Re: [PATCH v2 5/5] usb: host: xhci-plat: Add support for XHCI_WRITE_64_HI_LO

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Date: Fri, 31 May 2024 10:12:36 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Daehwan Jung <dh10.jung@...sung.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Thinh Nguyen
 <Thinh.Nguyen@...opsys.com>, Mathias Nyman <mathias.nyman@...el.com>,
 Felipe Balbi <balbi@...nel.org>
Cc: "open list:USB SUBSYSTEM" <linux-usb@...r.kernel.org>,
 "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
 <devicetree@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 5/5] usb: host: xhci-plat: Add support for
 XHCI_WRITE_64_HI_LO_QUIRK

On 31/05/2024 08:07, Daehwan Jung wrote:
> This is set by dwc3 parent node to support writing high-low order.
> 
> Signed-off-by: Daehwan Jung <dh10.jung@...sung.com>
> ---
>  drivers/usb/host/xhci-plat.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index 3d071b8..31bdfa5 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -256,6 +256,9 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s
>  		if (device_property_read_bool(tmpdev, "xhci-sg-trb-cache-size-quirk"))
>  			xhci->quirks |= XHCI_SG_TRB_CACHE_SIZE_QUIRK;
>  
> +		if (device_property_read_bool(tmpdev, "write-64-hi-lo-quirk"))
> +			xhci->quirks |= XHCI_WRITE_64_HI_LO;

Where is any user of this property (DTS)? Just to clarify: your
downstream does not matter really.

Best regards,
Krzysztof