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spi: stm32h7: ensure message are smaller than max size

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Ensure that messages given to transfer_one handler can actually be
handled by it. For that purpose rely on the SPI framework
spi_split_transfers_maxsize function to split messages whenever necessary.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Link: https://lore.kernel.org/r/1612551572-495-5-git-send-email-alain.volmat@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Alain Volmat 2021-02-05 19:59:28 +01:00 committed by Mark Brown
parent 5a380b833a
commit 084de52328
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GPG Key ID: 24D68B725D5487D0
1 changed files with 14 additions and 0 deletions
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14
drivers/spi/spi-stm32.c
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@ -1004,6 +1004,20 @@ static int stm32_spi_prepare_msg(struct spi_master *master,
!!(spi_dev->mode & SPI_LSB_FIRST),
!!(spi_dev->mode & SPI_CS_HIGH));
/* On STM32H7, messages should not exceed a maximum size setted
* afterward via the set_number_of_data function. In order to
* ensure that, split large messages into several messages
*/
if (spi->cfg->set_number_of_data) {
int ret;
ret = spi_split_transfers_maxsize(master, msg,
STM32H7_SPI_TSIZE_MAX,
GFP_KERNEL | GFP_DMA);
if (ret)
return ret;
}
spin_lock_irqsave(&spi->lock, flags);
/* CPOL, CPHA and LSB FIRST bits have common register */