tree 9868b22bc446e7ba9590bc9930078247a62f54ff
parent 30d897167d0d909e438c119909ab2f4403baf005
author Nico Huber <nico.h@gmx.de> 1619949131 +0200
committer Nico Huber <nico.h@gmx.de> 1623747953 +0000

dp aux: Handle partially acked multi-byte I2C writes

There is another case when we have to keep querying the I2C status
after starting a write transaction: When some bytes were already acked,
we receive an I2C-ACK for them and the number of bytes ack'ed. So
re-write the loop such that it always continues until one of these
conditions occur:

* We receive an I2C-ACK without additional data: This means
  all remaining bytes have been ack'ed.

* The summed up number of transferred bytes reaches the
  number of written bytes.

* We get an I2C-Defer but have re-tried too often without
  getting additional ACKs.

* We get an I2C-NAK.

Change-Id: I794dc1587f56b81539d1d4796f754644172f89b7
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/libgfxinit/+/52826
Tested-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>