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authorAlain Volmat <alain.volmat@foss.st.com>2021-02-05 21:59:28 +0300
committerMark Brown <broonie@kernel.org>2021-02-05 22:16:58 +0300
commit084de5232820c9e857ccc2282c3d94f33f92a381 (patch)
tree0c9262efea4ca314048c043318d37b49d51f623e /drivers/spi
parent5a380b833ad437123dca91bf900a696709d9b6ab (diff)
downloadlinux-084de5232820c9e857ccc2282c3d94f33f92a381.tar.xz
spi: stm32h7: ensure message are smaller than max size
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>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-stm32.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
index a46132e81533..8e4db219b95d 100644
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -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 */