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
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