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SubjectRe: [PATCH v11 4/5] usb: dwc3: dwc3-qcom: Enable tx-fifo-resize property by default
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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@codeaurora.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.

>> + }
>
> 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.

Thanks
Wesley Cheng

--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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