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: v4->v5: - Add dll_enable = false 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 | 176 ++++++++++++++++++++++++++------- 1 file changed, 138 insertions(+), 38 deletions(-) base-commit: faf3b8014c357d71c7a9414302e217a1dd1679af -- 2.43.2
