TDA4VM: USB BULK Transfer

Ethan Tian

Part Number: TDA4VM

Hi Experts

Can we change the length of the USB transport packet and the customer needs to change the data size to a smaller size, how can we modify it？

over 1 year ago

0 Ethan Tian over 1 year ago

TI__Intellectual 1622 points

They are using Linux SDK 8.6

0 Ethan Tian over 1 year ago in reply to Ethan Tian

TI__Intellectual 1622 points

Hi Diwakar

Any update?

0 Diwakar Dhyani over 1 year ago in reply to Ethan Tian

TI__Guru 50150 points

HI Ethan

What is the speed mode customer is using ?

Try using the high-speed or full-speed.

Regards
Diwakar

0 Ethan Tian over 1 year ago in reply to Diwakar Dhyani

TI__Intellectual 1622 points

Hi Diwakar

This may not match the title of my thread. My question is whether it is possible to change the length of the transmission packet and make it smaller.

0 Diwakar Dhyani over 1 year ago in reply to Ethan Tian

TI__Guru 50150 points

Hi Ethan

The size of the packet depends on the speed mode which you are using.

Regards
Diwakar

0 Ethan Tian over 1 year ago in reply to Diwakar Dhyani

TI__Intellectual 1622 points

Hi Diwakar

Does this mean that it cannot be customized to make it smaller? Is it possible to do this at the application layer?

0 Diwakar Dhyani over 1 year ago in reply to Ethan Tian

TI__Guru 50150 points

Hi Ethan

You might need to change that in the driver .

TI has't tested the driver with these modification.

Regards
Diwakar

0 sheng wang over 1 year ago in reply to Diwakar Dhyani

Prodigy 130 points

I've changed the lower part of the diagram to 64, and live testing doesn't seem to have taken effect.

The device tree is configured as follows.

0 Diwakar Dhyani over 1 year ago in reply to sheng wang

TI__Guru 50150 points

HI Ethan

Instead of changing in the driver have you tried changing the speed mode in the dtsi to full-speed ?

Regards
Diwakar

0 sheng wang over 1 year ago in reply to Diwakar Dhyani

Prodigy 130 points

Hi Diwakar

My question is not about full-speed, but about how max_packet_size is set to 64 in super mode.

0 Diwakar Dhyani over 1 year ago in reply to sheng wang

TI__Guru 50150 points

HI Sheng

May i know why you want to change the packet size ?

If you change the speed mode then also the packet size will change.

Regards
Diwakar

0 sheng wang over 1 year ago in reply to Diwakar Dhyani

Prodigy 130 points

Hi Diwakar

We have a WiFi module that is connected to the tda4 via usb, but with the default configuration (WiFi is usb2.0, tda4 is usb3.0) it would lose the connection by chance while transmitting the data, when configuring the tda4 unusb1.0 the transmission was stable.
The reason for configuring the max transfer packets to 64 is to test its stability in usb3.0 mode, as we still have bandwidth requirements.

Translated with www.DeepL.com/Translator (free version)

0 Diwakar Dhyani over 1 year ago in reply to sheng wang

TI__Guru 50150 points

HI Sheng

If you don't want to use the USB3.0 functionality , can we disable that from the host controller itself and just use the USB2.0?

Will that be ok for you ?

Regards
Diwakar

0 sheng wang over 1 year ago in reply to Diwakar Dhyani

Prodigy 130 points

Hi Diwakar

The host side is usb2.0 by default. tda4 is 3.0, is it possible that configuring the tda4 side to 2.0 can improve compatibility?

0 Diwakar Dhyani over 1 year ago in reply to sheng wang

TI__Guru 50150 points

HI Sheng

what do you mean by HOST here , as you said wifi module is connected to the TDA4 then what is the host.

sheng wang said:
The host side is usb2.0 by default. tda4 is 3.0, is it possible that configuring the tda4 side to 2.0 can improve compatibility?

If you want to use the USB controller of the TDA4 in the usb2.0 you can directly do that by adding the mentioned property(ti,usb2-only).

Regards
Diwakar

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TDA4VM: USB BULK Transfer