diff mbox series

[2/4,v3] spi: dw: Fix default polarity of native chipselect

Message ID 20190116082110.5604-2-linus.walleij@linaro.org
State Accepted
Commit 6e0a32d6f376ea22a34ae3a8df60adafbcdb0c86
Headers show
Series None | expand

Commit Message

Linus Walleij Jan. 16, 2019, 8:21 a.m. UTC 
The DW controller also supports platforms specifying
native chipselects. When I enforce the use of high CS
for drivers opting in for using GPIO descriptors, I
inadvertedly switched the driver to also use active
high chip select for native chip selects.

As it turns out, the DW hardware driving chip selects
also thinks it is weird with active low chip selects
so all we need to do is remove an inversion in the
driver.

Cc: Jan Kotas <jank@cadence.com>
Reported-by: Jan Kotas <jank@cadence.com>
Tested-by: Jan Kotas <jank@cadence.com>

Fixes: 9400c41e77b8 ("spi: dw: Convert to use CS GPIO descriptors")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

---
ChangeLog v1->v3:
- Collected Jan's Tested-by
ChangeLog v1->v2:
- Missed to alter the actually native chip select
  line control code. I need to be more awake.

Janek can you confirm if this in combination
with the previous patch solves your problem?
---
 drivers/spi/spi-dw.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

-- 
2.20.1
diff mbox series

Patch

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index f54b498001a9..64164f1a83f4 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -137,11 +137,10 @@  void dw_spi_set_cs(struct spi_device *spi, bool enable)
 	struct dw_spi *dws = spi_controller_get_devdata(spi->controller);
 	struct chip_data *chip = spi_get_ctldata(spi);
 
-	/* Chip select logic is inverted from spi_set_cs() */
 	if (chip && chip->cs_control)
-		chip->cs_control(!enable);
+		chip->cs_control(enable);
 
-	if (!enable)
+	if (enable)
 		dw_writel(dws, DW_SPI_SER, BIT(spi->chip_select));
 	else if (dws->cs_override)
 		dw_writel(dws, DW_SPI_SER, 0);