[PATCH v1 1/1] spi: Simplify conditionals in spi_set_cs()

[PATCH v1 1/1] spi: Simplify conditionals in spi_set_cs()

[Andy Shevchenko]

First of all, the (foo && bar) || (!foo && !bar) when foo and bar
are booleans is equivalent to (foo == bar). Second, reuse variable
that holds already the calculation of the SPI CS mode to be
active-high. No functional changes intended.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index ef755d11374d..3c6c70468899 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1077,10 +1077,8 @@ static void spi_set_cs(struct spi_device *spi, bool enable, bool force)
 	 * Avoid calling into the driver (or doing delays) if the chip select
 	 * isn't actually changing from the last time this was called.
 	 */
-	if (!force && ((enable && spi->controller->last_cs_index_mask == spi->cs_index_mask &&
-			spi_is_last_cs(spi)) ||
-		       (!enable && spi->controller->last_cs_index_mask == spi->cs_index_mask &&
-			!spi_is_last_cs(spi))) &&
+	if (!force && (enable == spi_is_last_cs(spi)) &&
+	    (spi->controller->last_cs_index_mask == spi->cs_index_mask) &&
 	    (spi->controller->last_cs_mode_high == (spi->mode & SPI_CS_HIGH)))
 		return;
 
@@ -1089,9 +1087,9 @@ static void spi_set_cs(struct spi_device *spi, bool enable, bool force)
 	spi->controller->last_cs_index_mask = spi->cs_index_mask;
 	for (idx = 0; idx < SPI_CS_CNT_MAX; idx++)
 		spi->controller->last_cs[idx] = enable ? spi_get_chipselect(spi, 0) : SPI_INVALID_CS;
-	spi->controller->last_cs_mode_high = spi->mode & SPI_CS_HIGH;
 
-	if (spi->mode & SPI_CS_HIGH)
+	spi->controller->last_cs_mode_high = spi->mode & SPI_CS_HIGH;
+	if (spi->controller->last_cs_mode_high)
 		enable = !enable;
 
 	/*
-- 
2.47.2

Re: [PATCH v1 1/1] spi: Simplify conditionals in spi_set_cs()

[Mark Brown]

On Mon, 31 Mar 2025 12:39:15 +0300, Andy Shevchenko wrote:
> First of all, the (foo && bar) || (!foo && !bar) when foo and bar
> are booleans is equivalent to (foo == bar). Second, reuse variable
> that holds already the calculation of the SPI CS mode to be
> active-high. No functional changes intended.
> 
> 

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next

Thanks!

[1/1] spi: Simplify conditionals in spi_set_cs()
      commit: 1f1d979fbf741c3608a344373f88444dc8749967

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark