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[ Upstream commit ad97d9de45835b6a0f71983b0ae0cffd7306730a ] Driver shouldn't try to access any GFX registers until RLC is idle. During the test, it took 12 seconds for RLC to clear the BUSY bit in RLC_GPM_STAT register which is un-acceptable for driver. As per RLC engineer, it would take RLC Ucode less than 10,000 GFXCLK cycles to finish its critical section. In a lowest 300M enginer clock setting(default from vbios), 50 us delay is enough. This commit fix the hang when RLC introduce the work around for XGMI which requires more cycles to setup more registers than normal Signed-off-by: shaoyunl <shaoyun.liu@amd.com> Acked-by: Felix Kuehling <Felix.Kuehling@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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.