This is a note to let you know that I've just added the patch titled spi: pxa2xx: Do not detect number of enabled chip selects on Intel SPT to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: spi-pxa2xx-do-not-detect-number-of-enabled-chip-selects-on-intel-spt.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 66ec246eb9982e7eb8e15e1fc55f543230310dd0 Mon Sep 17 00:00:00 2001 From: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx> Date: Tue, 26 Apr 2016 10:08:26 +0300 Subject: spi: pxa2xx: Do not detect number of enabled chip selects on Intel SPT From: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx> commit 66ec246eb9982e7eb8e15e1fc55f543230310dd0 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: 8b136baa5892 ("spi: pxa2xx: Detect number of enabled Intel LPSS SPI chip select signals") Signed-off-by: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx> Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/spi/spi-pxa2xx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/spi/spi-pxa2xx.c +++ b/drivers/spi/spi-pxa2xx.c @@ -111,7 +111,7 @@ static const struct lpss_config lpss_pla .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, Patches currently in stable-queue which might be from jarkko.nikula@xxxxxxxxxxxxxxx are queue-4.4/spi-pxa2xx-do-not-detect-number-of-enabled-chip-selects-on-intel-spt.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html