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[ Upstream commitdad4e7fda4] The current implementation always uses rpmh_write_async, which doesn't wait for completion. That's fine for disable requests since there's no immediate need for the clocks and they can be disabled in the background. However, for enable requests we need to ensure the clocks are actually enabled before returning to the client. Otherwise, clients can end up accessing their HW before the necessary clocks are enabled, which can lead to bus errors. Use the synchronous version of this API (rpmh_write) for enable requests in the active set to ensure completion. Completion isn't required for sleep/wake sets, since they don't take effect until after we enter sleep. All rpmh requests are automatically flushed prior to entering sleep. Fixes:9c7e47025a("clk: qcom: clk-rpmh: Add QCOM RPMh clock driver") Signed-off-by: Mike Tipton <mdtipton@codeaurora.org> Link: https://lkml.kernel.org/r/20200215021232.1149-1-mdtipton@codeaurora.org Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> [sboyd@kernel.org: Reorg code a bit for readability, rename to 'wait' to make local variable not conflict with completion.h mechanism] Signed-off-by: Stephen Boyd <sboyd@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.