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[ Upstream commiteffe89e400] On reset deassert, we must wait a bit after the rstst bit change before we allow clockdomain autoidle again. Otherwise we get the following oops sometimes on dra7 with iva: Unhandled fault: imprecise external abort (0x1406) at 0x00000000 44000000.ocp:L3 Standard Error: MASTER MPU TARGET IVA_CONFIG (Read Link): At Address: 0x0005A410 : Data Access in User mode during Functional access Internal error: : 1406 [#1] SMP ARM ... (sysc_write_sysconfig) from [<c0782cb0>] (sysc_enable_module+0xcc/0x260) (sysc_enable_module) from [<c0782f0c>] (sysc_runtime_resume+0xc8/0x174) (sysc_runtime_resume) from [<c0a3e1ac>] (genpd_runtime_resume+0x94/0x224) (genpd_runtime_resume) from [<c0a33f0c>] (__rpm_callback+0xd8/0x180) It is unclear what all devices this might affect, but presumably other devices with the rstst bit too can be affected. So let's just enable the delay for all the devices with rstst bit for now. Later on we may want to limit the list to the know affected devices if needed. Fixes:d30cd83f68("soc: ti: omap-prm: add support for denying idle for reset clockdomain") Reported-by: Yongqin Liu <yongqin.liu@linaro.org> Signed-off-by: Tony Lindgren <tony@atomide.com> 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
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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.