TDA2SX: i2c fifo depth setting

dota2_black

Part Number: TDA2SX

I have a problm on how to change i2c fifodepth

eg:

root@dra7xx-evm:~# devmem2 0x480600C0
/dev/mem opened.
Memory mapped at address 0xb6fc4000.
Read at address 0x480600C0 (0xb6fc40c0): 0x00004000
root@dra7xx-evm:~# devmem2 0x48060094
/dev/mem opened.
Memory mapped at address 0xb6f57000.
Read at address 0x48060094 (0xb6f57094): 0x00003F00

As you can see the i2c3 module in tda2sx , there is no effect , when i increase the threshold (3F means threshold is 64).

but the i2c fifodepth is always 16 byte.

over 6 years ago

0 Nikhil Devshatwar over 6 years ago

TI__Genius 9905 points

Hi,

You should not use devmem for this.

Modify the kernel driver / DTB for this

Regards,

Nikhil D

0 Nikhil Devshatwar over 6 years ago in reply to Nikhil Devshatwar

TI__Genius 9905 points

Hi,

If you refer to TRM, note that the I2C_BUFSTAT register has a read only field for FIFO depth.

You cannot write to it.

Regards,

Nikhil D

0 dota2_black over 6 years ago in reply to Nikhil Devshatwar

Prodigy 40 points

according to the trm, the i2c fifo depth is max to 64BYTE,

how to change it ?

please give a idea, thank you

0 dota2_black over 6 years ago in reply to Nikhil Devshatwar

Prodigy 40 points

how can i increase the i2c fifo depth through dts ?

please give a idea, thank you !!!

0 Nikhil Devshatwar over 6 years ago in reply to dota2_black

TI__Genius 9905 points

Hi,

MAX FIFO depth available is fixed, you cannot change that. In your case, it shows FIFO depth to be 16. You cannot change it.

The threshold value should be less than the MAX FIFO depth available. You can try to configure FIFO depth between 1 to 16

Higher values will not work.

Regards,

NIkhil D

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TDA2SX: i2c fifo depth setting