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spi: Create a helper to derive adaptive timeouts

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Big transfers might take a bit of time, too constraining timeouts might
lead to false positives. In order to simplify the drivers work and with
the goal of factorizing code in mind, let's add a helper that can be
used by any spi controller driver to derive a relevant per-transfer
timeout value.

The logic is simple: we know how much time it would take to transfer a
byte, we can easily derive the total theoretical amount of time involved
for each transfer. We multiply it by two to have a bit of margin and
enforce a minimum of 500ms.

Suggested-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/Message-Id: <20230622090634.3411468-2-miquel.raynal@bootlin.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Miquel Raynal 2023-06-22 11:06:32 +02:00 committed by Mark Brown
parent e6afe03351
commit d8e4ebf870
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1 changed files with 17 additions and 0 deletions
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17
include/linux/spi/spi.h
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@ -1261,6 +1261,23 @@ static inline bool spi_is_bpw_supported(struct spi_device *spi, u32 bpw)
return false;
}
/**
* spi_controller_xfer_timeout - Compute a suitable timeout value
* @ctlr: SPI device
* @xfer: Transfer descriptor
*
* Compute a relevant timeout value for the given transfer. We derive the time
* that it would take on a single data line and take twice this amount of time
* with a minimum of 500ms to avoid false positives on loaded systems.
*
* Returns: Transfer timeout value in milliseconds.
*/
static inline unsigned int spi_controller_xfer_timeout(struct spi_controller *ctlr,
struct spi_transfer *xfer)
{
return max(xfer->len * 8 * 2 / (xfer->speed_hz / 1000), 500U);
}
/*---------------------------------------------------------------------------*/
/* SPI transfer replacement methods which make use of spi_res */