I.MX8QM maxload size

[mallibeerala]

Dear Team,

I am using I.MX8QM board.

What is the maximum payload size capability.

In I.MX8QM RM mentioned as maxload size as 128, in my board I am tested max payload capability as 256. Please confirm maximum payload size capability.

In software Where I have to control payload size.

I am using kernel version: 5.15.32

Thanks & Regards,
Mallikarjuna.

[JosephAtNXP]

Hi,

Thank you for your interest in NXP Semiconductor products,

Payload depends on EP payload capabilities, RC must set MAX_PAYLOAD_SIZE for EP conditions, I guess that your EP has a 256 byte payload size which is leveraged by the IP.

It's an expected behavior.

Regards

[mallibeerala]

Hi josephlinares,

In Reference manual manual "Max_Payload_Size" mentioned as (128 bytes). My EP has a payload size of 1024.

In auto negatioation capability: Max_Payload_Size set to 256, Control: Max_Payload_Size set to 128.

What is the MAX_PAYLOAD_SIZE that processor support.

Thanks & Regards,
Mallikarjuna.

[JosephAtNXP]

Hi,

What is the value that's been set to PCIE_CAP_MAX_PAYLOAD_SIZE?

Regards

[mallibeerala]

Hi,

PCIE_CAP_MAX_PAYLOAD_SIZE is not using anywhere in my kernel 5.15.32.

Can you please provide information where I have to check (PCIE_CAP_MAX_PAYLOAD_SIZE) for this kernel version.

PCIE_CAP_MAX_PAYLOAD_SIZE, available at pci-meson.c, it is for Amlogic MESON SoCs.

Thanks & Regards,
Mallikarjuna