On Mon, Apr 23, 2018 at 05:52:28PM +0800, Huang Rui wrote: > On Fri, Apr 20, 2018 at 05:59:16PM +0800, Koenig, Christian wrote: > > Am 20.04.2018 um 11:40 schrieb Huang Rui: > > > "aaabaf4 drm/amdgpu: defer test IBs on the rings at boot (V3)" > > > Above patch defers the execution of gfx/compute ib tests. However, at that time, > > > the gfx may already go into idle state. If "idle" gfx receives command > > > submission, it will get hang in the system. So we must add is_gfx_on checking at > > > start of ib tests. > > > > Do I see that right that you just skip the IB test when the GFX block is > > already turned of? In this case that would be a clear NAK. > > > > BTW: How do you detect that we need to turn GFX on again? > > Christian, I know point. But there is a hang issue if we would like try to > disable/enable gfxoff with SMC message at runtime. Actually, I am trying to > find a good sequence to fix it. After that, I can even expose an debugfs > interface to configure that. So I have to skip the test for the moment when > gfx is in "idle". > And in normal case, driver won't explicitly turn on/off the gfx. RLC firmware will handle it. Thanks, Ray
