spi: pxa2xx: Do not detect number of enabled chip selects on Intel SPT

Certain Intel Sunrisepoint PCH variants report zero chip selects in SPI
capabilities register even they have one per port. Detection in
pxa2xx_spi_probe() sets master->num_chipselect to 0 leading to -EINVAL
from spi_register_master() where chip select count is validated.

Fix this by not using SPI capabilities register on Sunrisepoint. They don't
have more than one chip select so use the default value 1 instead of
detection.

Fixes: 8b136baa5892 ("spi: pxa2xx: Detect number of enabled Intel LPSS SPI chip select signals")
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 85e59a406a4c01fabef55679c5ffb9b9583bd852..86138e4101b07f990634d06af60b4c5a63ce4607 100644 (file)
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -126,7 +126,7 @@ static const struct lpss_config lpss_platforms[] = {
                .reg_general = -1,
                .reg_ssp = 0x20,
                .reg_cs_ctrl = 0x24,
-               .reg_capabilities = 0xfc,
+               .reg_capabilities = -1,
                .rx_threshold = 1,
                .tx_threshold_lo = 32,
                .tx_threshold_hi = 56,