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Without this > settle time the command issued immediately after tuning (e.g. the R1b > CMD6 that switches eMMC from HS200 down to HS during HS400 selection) > can time out. One additional concern is that the testing listed in the cover letter does not exercise the paths described here. The series reports testing SD DDR50 and eMMC DDR52, but neither mode performs tuning through sdhci_cdns6_set_tune_val(). Please test this change with eMMC HS200 and HS400. The same function is also used during SD SDR104 tuning, so SDR104 should be covered as well.