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

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commit 66ec246eb9 upstream.

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: 8b136baa58 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jarkko Nikula
2016-04-26 10:08:26 +03:00
committed by Greg Kroah-Hartman
parent 90204cbb48
commit ca100af959
1 changed files with 1 additions and 1 deletions
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2
drivers/spi/spi-pxa2xx.c
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@@ -111,7 +111,7 @@ 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,