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spi: spi-fsl-spi: relax message sanity checking a little

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The comment says that we should not allow changes (to
bits_per_word/speed_hz) while CS is active, and indeed the code below
does fsl_spi_setup_transfer() when the ->cs_change of the previous
spi_transfer was set (and for the very first transfer).

So the sanity checking is a bit too strict - we can change it to
follow the same logic as is used by the actual transfer loop.

Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Rasmus Villemoes 2019-03-27 14:30:51 +00:00 committed by Mark Brown
parent 24c3636233
commit 17ecffa289
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GPG Key ID: 24D68B725D5487D0
1 changed files with 5 additions and 3 deletions
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8
drivers/spi/spi-fsl-spi.c
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@ -370,13 +370,15 @@ static int fsl_spi_do_one_msg(struct spi_master *master,
int status;
/* Don't allow changes if CS is active */
first = list_first_entry(&m->transfers, struct spi_transfer,
transfer_list);
cs_change = 1;
list_for_each_entry(t, &m->transfers, transfer_list) {
if (cs_change)
first = t;
cs_change = t->cs_change;
if ((first->bits_per_word != t->bits_per_word) ||
(first->speed_hz != t->speed_hz)) {
dev_err(&spi->dev,
"bits_per_word/speed_hz should be same for the same SPI transfer\n");
"bits_per_word/speed_hz cannot change while CS is active\n");
return -EINVAL;
}
}