linux-kernel - Re: [PATCH v2 2/5] usb: dwc3: Support quirk for writing high-low order

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Date: Tue, 4 Jun 2024 00:16:33 +0000
From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To: Daehwan Jung <dh10.jung@...sung.com>
CC: 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>,
        "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 2/5] usb: dwc3: Support quirk for writing high-low
 order

On Fri, May 31, 2024, Daehwan Jung wrote:
> Set xhci "write-64-hi-lo-quirk" property via
> "snps,xhci-write-64-hi-lo-quirk" property.

Please describe the change as if the reader has no context of the other
patches in the series.

> 
> Signed-off-by: Daehwan Jung <dh10.jung@...sung.com>
> ---

Please provide change note for v2.

>  drivers/usb/dwc3/core.c | 3 +++
>  drivers/usb/dwc3/core.h | 2 ++
>  drivers/usb/dwc3/host.c | 5 ++++-
>  3 files changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 7ee61a8..89985fd 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1716,6 +1716,9 @@ static void dwc3_get_properties(struct dwc3 *dwc)
>  	dwc->dis_split_quirk = device_property_read_bool(dev,
>  				"snps,dis-split-quirk");
>  
> +	dwc->xhci_write_64_hi_lo_quirk = device_property_read_bool(dev,
> +				"snps,xhci-write-64-hi-lo-quirk");
> +
>  	dwc->lpm_nyet_threshold = lpm_nyet_threshold;
>  	dwc->tx_de_emphasis = tx_de_emphasis;
>  
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 3781c73..ab5913c 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -1142,6 +1142,7 @@ struct dwc3_scratchpad_array {
>   *	3	- Reserved
>   * @dis_metastability_quirk: set to disable metastability quirk.
>   * @dis_split_quirk: set to disable split boundary.
> + * @xhci_write_64_hi_lo_quirk: set if we enable quirk for writing in high-low order.

The description should be more detail here. But I don't think we need
this. Just pass the PROPERTY_ENTRY_BOOL("write-64-hi-lo-quirk") to xhci
platform unconditionally. This should apply to all released versions (at
the moment) of DWC_usb3x.

>   * @sys_wakeup: set if the device may do system wakeup.
>   * @wakeup_configured: set if the device is configured for remote wakeup.
>   * @suspended: set to track suspend event due to U3/L2.
> @@ -1369,6 +1370,7 @@ struct dwc3 {
>  	unsigned		dis_metastability_quirk:1;
>  
>  	unsigned		dis_split_quirk:1;
> +	unsigned		xhci_write_64_hi_lo_quirk:1;
>  	unsigned		async_callbacks:1;
>  	unsigned		sys_wakeup:1;
>  	unsigned		wakeup_configured:1;
> diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
> index a171b27..8cc0def 100644
> --- a/drivers/usb/dwc3/host.c
> +++ b/drivers/usb/dwc3/host.c
> @@ -126,7 +126,7 @@ static int dwc3_host_get_irq(struct dwc3 *dwc)
>  
>  int dwc3_host_init(struct dwc3 *dwc)
>  {
> -	struct property_entry	props[5];
> +	struct property_entry	props[6];
>  	struct platform_device	*xhci;
>  	int			ret, irq;
>  	int			prop_idx = 0;
> @@ -162,6 +162,9 @@ int dwc3_host_init(struct dwc3 *dwc)
>  
>  	props[prop_idx++] = PROPERTY_ENTRY_BOOL("xhci-sg-trb-cache-size-quirk");
>  
> +	if (dwc->xhci_write_64_hi_lo_quirk)
> +		props[prop_idx++] = PROPERTY_ENTRY_BOOL("write-64-hi-lo-quirk");
> +
>  	if (dwc->usb3_lpm_capable)
>  		props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb3-lpm-capable");
>  
> -- 
> 2.7.4
> 

Thanks,
Thinh