linux-kernel - [PATCH 4.14 17/28] spi: stm32: FIFO threshold level

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Date:   Fri, 15 Jan 2021 13:27:54 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Roman Guskov <rguskov@...electronics.com>,
        Marek Vasut <marex@...x.de>, Mark Brown <broonie@...nel.org>
Subject: [PATCH 4.14 17/28] spi: stm32: FIFO threshold level - fix align packet size

From: Roman Guskov <rguskov@...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@...electronics.com>
Fixes: dcbe0d84dfa5 ("spi: add driver for STM32 SPI controller")
Reviewed-by: Marek Vasut <marex@...x.de>
Link: https://lore.kernel.org/r/20201221123532.27272-1-rguskov@dh-electronics.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -299,9 +299,9 @@ static u32 stm32_spi_prepare_fthlv(struc
 
 	/* 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;
 
 	return fthlv;
 }