From: Andy Shevchenko andriy.shevchenko@linux.intel.com
[ Upstream commit dbaca8e56ea3f23fa215f48c2d46dd03ede06e02 ]
The commit 7d93aecdb58d ("spi: Add generic support for unused native cs with cs-gpios") excludes the valid case for the controllers that doesn't need to switch native CS in order to perform the transfer, i.e. when
0 native ... ... <n> - 1 native <n> GPIO <n> + 1 GPIO ... ...
where <n> defines maximum of native CSs supported by the controller.
To allow this, bail out from spi_get_gpio_descs() conditionally for the controllers which explicitly marked with SPI_MASTER_GPIO_SS.
Fixes: 7d93aecdb58d ("spi: Add generic support for unused native cs with cs-gpios") Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Link: https://lore.kernel.org/r/20210420164425.40287-1-andriy.shevchenko@linux.int... Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/spi/spi.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index bd8b1f79dce2..a1a85f0baf7c 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -2615,8 +2615,9 @@ static int spi_get_gpio_descs(struct spi_controller *ctlr) }
ctlr->unused_native_cs = ffz(native_cs_mask); - if (num_cs_gpios && ctlr->max_native_cs && - ctlr->unused_native_cs >= ctlr->max_native_cs) { + + if ((ctlr->flags & SPI_MASTER_GPIO_SS) && num_cs_gpios && + ctlr->max_native_cs && ctlr->unused_native_cs >= ctlr->max_native_cs) { dev_err(dev, "No unused native chip select available\n"); return -EINVAL; }