linux-kernel - Re: [PATCH v11 4/5] usb: dwc3: dwc3-qcom: Enable tx-fifo-resize property by default

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Date:   Fri, 2 Jul 2021 10:19:47 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Wesley Cheng <wcheng@...eaurora.org>
Cc:     robh+dt@...nel.org, agross@...nel.org, bjorn.andersson@...aro.org,
        balbi@...nel.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, jackp@...eaurora.org,
        fntoth@...il.com
Subject: Re: [PATCH v11 4/5] usb: dwc3: dwc3-qcom: Enable tx-fifo-resize
 property by default

On Fri, Jul 02, 2021 at 01:10:13AM -0700, Wesley Cheng wrote:
> 
> 
> On 7/1/2021 10:06 PM, Greg KH wrote:
> > On Wed, Jun 30, 2021 at 02:00:41AM -0700, Wesley Cheng wrote:
> >> In order to take advantage of the TX fifo resizing logic, manually add
> >> these properties to the DWC3 child node by default.  This will allow
> >> the DWC3 gadget to resize the TX fifos for the IN endpoints, which
> >> help with performance.
> >>
> >> Signed-off-by: Wesley Cheng <wcheng@...eaurora.org>
> >> ---
> >>  drivers/usb/dwc3/dwc3-qcom.c | 21 +++++++++++++++++++++
> >>  1 file changed, 21 insertions(+)
> >>
> >> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> >> index 49e6ca9..cec4f4a 100644
> >> --- a/drivers/usb/dwc3/dwc3-qcom.c
> >> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> >> @@ -640,6 +640,25 @@ static int dwc3_qcom_acpi_register_core(struct platform_device *pdev)
> >>  	return ret;
> >>  }
> >>  
> >> +#ifdef CONFIG_OF
> >> +static void dwc3_qcom_add_dt_props(struct device *dev, struct device_node *np)
> >> +{
> >> +	struct property		*prop;
> >> +	int ret;
> >> +
> >> +	prop = devm_kzalloc(dev, sizeof(*prop), GFP_KERNEL);
> >> +	if (prop) {
> >> +		prop->name = "tx-fifo-resize";
> >> +		ret = of_add_property(np, prop);
> >> +		if (ret < 0)
> >> +			dev_info(dev, "unable to add tx-fifo-resize prop\n");
> 
> Hi Greg,
> > 
> > Is that really an "informational" error?  :(
> > 
> >
> We can remove it.  If anything we can always check the sysfs if the
> property is present or not.

Sorry for being vague.  That message should be dev_err(), and not
dev_info(), right?

> >> +	}
> > 
> > So if you can not allocate memory, you just fail quietly?  Are you sure
> > that is ok?
> > 
> > Please properly handle errors.
> > 
> OK, will handle the case where we can't allocate memory for the property.

And the case for when of_add_property() fails.

thanks,

greg k-h