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 10:59:15 +0900
From: Jung Daehwan <dh10.jung@...sung.com>
To: Thinh Nguyen <Thinh.Nguyen@...opsys.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>, 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 Tue, Jun 04, 2024 at 12:16:33AM +0000, Thinh Nguyen wrote:
> 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.
> 
Thanks for the comment. I will add it in next submission.
> > 
> > Signed-off-by: Daehwan Jung <dh10.jung@...sung.com>
> > ---
> 
> Please provide change note for v2.
I will do it.
> 
> >  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.
> 
I got it. If so, I also think it's not needed. I will remove this.
> >   * @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
> > 
> 
Best Regards,
Jung Daehwan
> Thanks,
> Thinh