[ Upstream commit 049d919168458ac54e7fad27cd156a958b042d2f ] When disabling a counter from ddr_perf_event_stop(), the counter value is reset to 0 at the same time. Preserve the counter value by performing a read-modify-write of the PMU register and clearing only the enable bit. Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com> Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel ============ There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. The formatted documentation can also be read online at: https://www.kernel.org/doc/html/latest/ There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. 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.
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