mmc: sdhci_am654: Add tuning algorithm for delay chain

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[ Upstream commit 6231d99dd4 ]

Currently the sdhci_am654 driver only supports one tuning
algorithm which should be used only when DLL is enabled. The
ITAPDLY is selected from the largest passing window and the
buffer is viewed as a circular buffer.

The new algorithm should be used when the delay chain
is enabled. The ITAPDLY is selected from the largest passing
window and the buffer is not viewed as a circular buffer.

This implementation is based off of the following paper: [1].

Also add support for multiple failing windows.

[1] https://www.ti.com/lit/an/spract9/spract9.pdf

Fixes: 13ebeae68a ("mmc: sdhci_am654: Add support for software tuning")
Signed-off-by: Judith Mendez <jm@ti.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20240320223837.959900-2-jm@ti.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Judith Mendez 2024-03-20 17:38:31 -05:00 • committed by Greg Kroah-Hartman

parent b003b8c15c

commit 57205cf9c1

1 changed files with 92 additions and 20 deletions

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drivers/mmc/host/sdhci_am654.c

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