Re: [RFC PATCH 11/14] usb: devicetree: dwc3: Add TRB prefetch count

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Hi,

Felipe Balbi wrote:
> Hi,
>
> Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx> writes:
>> DWC_usb32 has an enhancement that allows the controller to cache
>> multiple TRBs for non-control endpoints. Introduce a new property to
>> DWC3 to set the maximum number of TRBs to cache in advance. The property
>> can be set from 1 to DWC_USB32_CACHE_TRBS_PER_TRANSFER (CoreConsultant
>> value). By default, the number of cache TRB is
>> DWC_USB32_CACHE_TRBS_PER_TRANSFER.
>>
>> Signed-off-by: Thinh Nguyen <thinhn@xxxxxxxxxxxx>
>> ---
>>   Documentation/devicetree/bindings/usb/dwc3.txt | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
>> index 7da1c4e7d380..ff35fa6de2eb 100644
>> --- a/Documentation/devicetree/bindings/usb/dwc3.txt
>> +++ b/Documentation/devicetree/bindings/usb/dwc3.txt
>> @@ -105,6 +105,9 @@ Optional properties:
>>   			this and tx-thr-num-pkt-prd to a valid, non-zero value
>>   			1-16 (DWC_usb31 programming guide section 1.2.3) to
>>   			enable periodic ESS TX threshold.
>> + - snps,num-trb-prefetch: max value to do TRBs cache for DWC_usb32. The value
>> +			can be from 1 to DWC_USB32_CACHE_TRBS_PER_TRANSFER.
>> +			Default value is DWC_USB32_CACHE_TRBS_PER_TRANSFER.
> how about we just leave it at the maximum and in case someone notices
> problems, then we consider adding more DT bindings?
>

Sure. We can do that. I'll remove this.

Thinh




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