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spi: fsl-espi: reject MSB-first transfers with word sizes other than 8 or 16

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According to the ESPI spec MSB-first transfers are supported for
word size 8 and 16 only.

Check for this and reject MSB-first transfers with other word sizes.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Heiner Kallweit 2016-10-02 14:22:35 +02:00 committed by Mark Brown
parent b497eb0245
commit e4be7053b9
1 changed files with 10 additions and 0 deletions
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10
drivers/spi/spi-fsl-espi.c
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@ -153,6 +153,7 @@ static int fsl_espi_check_message(struct spi_message *m)
first = list_first_entry(&m->transfers, struct spi_transfer,
transfer_list);
list_for_each_entry(t, &m->transfers, transfer_list) {
if (first->bits_per_word != t->bits_per_word ||
first->speed_hz != t->speed_hz) {
@ -161,6 +162,15 @@ static int fsl_espi_check_message(struct spi_message *m)
}
}
/* ESPI supports MSB-first transfers for word size 8 / 16 only */
if (!(m->spi->mode & SPI_LSB_FIRST) && first->bits_per_word != 8 &&
first->bits_per_word != 16) {
dev_err(mspi->dev,
"MSB-first transfer not supported for wordsize %u\n",
first->bits_per_word);
return -EINVAL;
}
return 0;
}