Merge patch series "ram: k3-ddrss: Support partial inline ECC"

Neha Malcom Francis <[email protected]> says:

Currently, the inline ECC implementation enables inline ECC across the
entire DDR space. However this is not always required and a more common
ask is to have only a portion of the DDR protected as enabling ECC
impacts read/write performance metrics.

This series aims to modify the logic to firstly support partial inline
ECC in its' most basic form which works for single controllers. Then it
introduces an algorithm to support multi DDR controllers where
interleaving plays a role. Since interleaving is handled by the MSMC, it
only makes sense to have the MSMC decide the inline ECC ranges for each
DDR.

This series also introduces support for multiple partial regions of inline
ECC however due to complexity only support for single DDR is present now.

WIP: A commandline test case patch for verifying the correct behaviour
of inline ECC including partial case. Was targeted for v2 however a little
tricky to make it a general test case especially for multi-DDR cases, so
have not combined it in this series for now.

Testing:
- Memtester runs for J721S2 and J784S4 platforms with and without ECC
  enablement runs fine.
- Along with patches that add support for the commandline test (see WIP
  note above) J784S4 shows expected behavior for three sets of partial
  inline ECC regions (non-overlapping, and after modifying J784S4 to
  have single DDR instead of multi-DDR):
  https://gist.github.com/nehamalcom/bde7e14e96485e4a188c3af3af6d75d6

Link: https://lore.kernel.org/r/[email protected]

0 files changed, 0 insertions, 0 deletions