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spi: core: Only check bits_per_word validity when explicitly provided 

On SPI device probe, the core will call spi_setup in spi_add_device
before the corresponding driver was probed. When this happens, the
bits_per_word member of the device is not yet set by the driver,
resulting in the default being set to 8 bits-per-word.

However some controllers do not support 8 bits-per-word at all, which
results in a failure when checking the bits-per-word validity.

In order to support these devices, skip the bits-per-word validity
check when it is not explicitly provided by drivers.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Link: https://lore.kernel.org/r/20220412122207.130181-1-paul.kocialkowski@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Paul Kocialkowski 2022-04-12 14:22:07 +02:00 committed by Mark Brown
parent c6cf1fafb6
commit b3fe2e5167
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1 changed files with 11 additions and 6 deletions
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17
drivers/spi/spi.c
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@ -3513,13 +3513,18 @@ int spi_setup(struct spi_device *spi)
return -EINVAL;
}
if (!spi->bits_per_word)
if (!spi->bits_per_word) {
spi->bits_per_word = 8;
status = __spi_validate_bits_per_word(spi->controller,
spi->bits_per_word);
if (status)
return status;
} else {
/*
* Some controllers may not support the default 8 bits-per-word
* so only perform the check when this is explicitly provided.
*/
status = __spi_validate_bits_per_word(spi->controller,
spi->bits_per_word);
if (status)
return status;
}
if (spi->controller->max_speed_hz &&
(!spi->max_speed_hz ||