[PATCH 5.4 41/62] spi: stm32: FIFO threshold level - fix align packet size

Greg Kroah-Hartman
2021-01-15T12:55:17Z

From: Roman Guskov <rguskov@dh-electronics.com>

commit a590370d918fc66c62df6620445791fbe840344a upstream.

if cur_bpw <= 8 and xfer_len < 4 then the value of fthlv will be 1 and
SPI registers content may have been lost.

* If SPI data register is accessed as a 16-bit register and DSIZE <= 8bit,
better to select FTHLV = 2, 4, 6 etc

* If SPI data register is accessed as a 32-bit register and DSIZE > 8bit,
better to select FTHLV = 2, 4, 6 etc, while if DSIZE <= 8bit,
better to select FTHLV = 4, 8, 12 etc

Signed-off-by: Roman Guskov <rguskov@dh-electronics.com>
Fixes: dcbe0d84dfa5 ("spi: add driver for STM32 SPI controller")
Reviewed-by: Marek Vasut <marex@denx.de>
Link: https://lore.kernel.org/r/20201221123532.27272-1-rguskov@dh-electronics.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/spi/spi-stm32.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -494,9 +494,9 @@ static u32 stm32h7_spi_prepare_fthlv(str

/* align packet size with data registers access */
if (spi->cur_bpw > 8)
- fthlv -= (fthlv % 2); /* multiple of 2 */
+ fthlv += (fthlv % 2) ? 1 : 0;
else
- fthlv -= (fthlv % 4); /* multiple of 4 */
+ fthlv += (fthlv % 4) ? (4 - (fthlv % 4)) : 0;

if (!fthlv)
fthlv = 1;