mmc: sdhci_am654: Fallback to DT-provided itap delay on DDR50 tuning failure

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DDR50 mode is not required to support the tuning command CMD19, meaning
that calibration may fail on cards that do not implement it, in which
case a known-good itap delay value should be programmed into the host
controller.

Do this by reading the (already defined) itap delay DT property for DDR50
and, if tuning fails for this mode, fall back to the DT-provided itap delay
value. If the DT does not provide a value for DDR50 fallback then this
simply disables using itapdly.

Fixes: 901d16e462 ("mmc: sdhci_am654: Add retry tuning")
Cc: stable@vger.kernel.org
Signed-off-by: Diogo Ivo (Schneider Electric) <diogo.ivo@bootlin.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Judith Mendez <jm@ti.com>
Signed-off-by: Ulf Hansson <ulfh@kernel.org>

...

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Diogo Ivo (Schneider Electric) 2026-08-07 13:07:00 +02:00 • committed by Ulf Hansson

parent c9f47cc8c3

commit 308d052252

1 changed files with 21 additions and 5 deletions

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drivers/mmc/host/sdhci_am654.c

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