[v4,0/7] Add tuning algorithm for delay chain

Message

Judith Mendez March 18, 2024, 7:11 p.m. UTC

This patch series introduces a new tuning algorithm for
mmc. The new algorithm should be used when delay chain is
enabled. The ITAPDLY is selected from the largest passing
window and the buffer is not viewed as a circular buffer.
The new tuning algorithm is implemented as per the paper
published here [0] and has been tested on the following
platforms: AM62x SK, AM62A SK, AM62p SK, AM64x SK, and AM64x
EVM.

The series also includes a few fixes in the sdhci_am654
driver on OTAPDLYEN/ITAPDLYEN and ITAPDELSEL.

Changelog:
v3->v4:
- Add acked-by
- Remove extra newline
v2->v3:
- Remove fixes tags when not needed
- Fix return for tuning algorithm
- Fix ITAPDLY_LAST_INDEX
- Use reverse fir tree order for variable declarations
- Save all ITAPDLYENA changes in itap_del_ena[]
- Remove unnecessary parenthesis
- Remove unnecessary variables
- Save itapdlyena for HS400 timing
v1->v2:
- Remove unnecessary indentations and if/else in
 sdhci_am654_calculate_itap
- Optimize sdhci_am654_calculate_itap()
- Call sdhci_am654_write_itapdly() in sdhci_am654_set_clock()
 instead of sdhci_am654_setup_dll()
- Change otap_del_sel[], itap_del_sel[], and itap_del_ena[]
 to type u32
- Revert unnecessary reformating in sdhci_am654_set_clock()
 and sdhci_j721e_4bit_set_clock()


Judith Mendez (7):
  mmc: sdhci_am654: Add tuning algorithm for delay chain
  mmc: sdhci_am654: Write ITAPDLY for DDR52 timing
  mmc: sdhci_am654: Add OTAP/ITAP delay enable
  mmc: sdhci_am654: Fix itapdly/otapdly array type
  mmc: sdhci_am654: Update comments in sdhci_am654_set_clock
  mmc: sdhci_am654: Add ITAPDLYSEL in sdhci_j721e_4bit_set_clock
  mmc: sdhci_am654: Fix ITAPDLY for HS400 timing

 drivers/mmc/host/sdhci_am654.c | 175 ++++++++++++++++++++++++++-------
 1 file changed, 137 insertions(+), 38 deletions(-)


base-commit: faf3b8014c357d71c7a9414302e217a1dd1679af