mainlining shenanigans
77a9febfd8
When prescaler (PSC) is 0, it means div factor is 1: counter clock frequency is equal to input clk / (PSC + 1). When reload value is 8 for example, counter counts 9 cycles, from 0 to 8. This is handled in frequency write routine, by writing respectively: - prescaler - 1 to PSC - reload value - 1 to ARR This fix does the opposite when reading the frequency from PSC and ARR: - prescaler is PSC + 1 - reload value is ARR + 1 Thus, PSC may be 0, depending on requested sampling frequency (div 1). In this case, reading freq wrongly reports 0, instead of computing and reporting correct value. Remove test on !psc and !arr. Small test on stm32f4 (example on tim1_trgo), before this fix: $ cd /sys/bus/iio/devices/triggerX $ echo 10000 > sampling_frequency $ cat sampling_frequency 0 After this fix: $ echo 10000 > sampling_frequency $ cat sampling_frequency 10000 Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com> Cc: <Stable@vger.kernel.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.