Patch "iio: adc: xilinx: Fix VREFN sign" has been added to the 4.0-stable tree
Subsystems (3)
This is a note to let you know that I've just added the patch titled
iio: adc: xilinx: Fix VREFN sign
to the 4.0-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:
iio-adc-xilinx-fix-vrefn-sign.patch
and it can be found in the queue-4.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.
Quoted 1 line
From
97ffae1d30c3f6ceee67d5b0d3e540c08c13c744Mon Sep 17 00:00:00 2001
From: Thomas Betker <[email protected]>
Date: Wed, 15 Apr 2015 21:11:50 +0200
Subject: iio: adc: xilinx: Fix VREFN sign
From: Thomas Betker <[email protected]>
commit 97ffae1d30c3f6ceee67d5b0d3e540c08c13c744 upstream.
The VREFN channel is bipolar, not unipolar. Small negative values do occur (e.g., -1mV), and unsigned conversion maps them incorrectly to large positive values (about +1V), so fix this.
--- drivers/iio/adc/xilinx-xadc-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
drivers/iio/adc/xilinx-xadc-core.c +1 -1
@@ -997,7 +997,7 @@ static const struct iio_event_spec xadc_ .num_event_specs = (_alarm) ? ARRAY_SIZE(xadc_voltage_events) : 0, \ .scan_index = (_scan_index), \ .scan_type = { \ - .sign = 'u', \ + .sign = ((_addr) == XADC_REG_VREFN) ? 's' : 'u', \ .realbits = 12, \ .storagebits = 16, \ .shift = 4, \
Patches currently in stable-queue which might be from [email protected] are
queue-4.0/iio-adc-xilinx-fix-register-addresses.patch queue-4.0/iio-adc-xilinx-fix-vccaux-channel-.address.patch queue-4.0/iio-adc-xilinx-fix-vrefp-scale.patch queue-4.0/iio-adc-xilinx-fix-vrefn-sign.patch