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spi: omap2-mcspi: Disable multi mode when CS should be kept asserted after message

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When the last transfer of a SPI message has the cs_change flag, the CS is kept
asserted after the message.
Multi-mode can't respect this as CS is deasserted by the hardware at the end of
the message.

Disable multi-mode when not applicable to the current message.

Fixes: d153ff4056 ("spi: omap2-mcspi: Add support for MULTI-mode")
Signed-off-by: Félix Piédallu <felix.piedallu@non.se.com>
Link: https://patch.msgid.link/20250606-cs_change_fix-v1-1-27191a98a2e5@non.se.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Félix Piédallu 2025-06-06 15:37:24 +02:00 committed by Mark Brown
parent 19272b37aa
commit a5bf527229
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GPG Key ID: 24D68B725D5487D0
1 changed files with 9 additions and 3 deletions
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12
drivers/spi/spi-omap2-mcspi.c
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@ -1287,9 +1287,15 @@ static int omap2_mcspi_prepare_message(struct spi_controller *ctlr,
mcspi->use_multi_mode = false;
}
/* Check if transfer asks to change the CS status after the transfer */
if (!tr->cs_change)
mcspi->use_multi_mode = false;
if (list_is_last(&tr->transfer_list, &msg->transfers)) {
/* Check if transfer asks to keep the CS status after the whole message */
if (tr->cs_change)
mcspi->use_multi_mode = false;
} else {
/* Check if transfer asks to change the CS status after the transfer */
if (!tr->cs_change)
mcspi->use_multi_mode = false;
}
/*
* If at least one message is not compatible, switch back to single mode