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spi: pxa2xx: Don't touch CS pin until we have a transfer pending 

GPIO descriptors, when being requested, may configure pin at the same
time. In case of SPI chip select we shouldn't do any assumptions of the
state of pin since we don't know yet what chip is connected there and if
it uses high or low active state. So, leave the state of pin as is until
transfer will start.

Fixes: 99f499cd65 ("spi: pxa2xx: Add support for GPIO descriptor chip selects")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westeberg <mika.westerberg@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Andy Shevchenko 2017-07-27 18:49:33 +03:00 committed by Mark Brown
parent 6ac5a435ae
commit d35f2dc9a2
1 changed files with 1 additions and 2 deletions
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3
drivers/spi/spi-pxa2xx.c
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@ -1769,8 +1769,7 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
for (i = 0; i < master->num_chipselect; i++) {
struct gpio_desc *gpiod;
gpiod = devm_gpiod_get_index(dev, "cs", i,
GPIOD_OUT_HIGH);
gpiod = devm_gpiod_get_index(dev, "cs", i, GPIOD_ASIS);
if (IS_ERR(gpiod)) {
/* Means use native chip select */
if (PTR_ERR(gpiod) == -ENOENT)