[Bug 107277] Raven: pci_pm_suspend takes over 1 second

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=107277

Paul Menzel <pmenzel+bugs.freedesktop@molgen.mpg.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #6 from Paul Menzel <pmenzel+bugs.freedesktop@molgen.mpg.de> ---
(In reply to Paul Menzel from comment #3)
> (In reply to Christian König from comment #2)

[…]

> > > amdgpu_device_ip_suspend [amdgpu] (694.390 ms @ 75.000977)
> > 
> > This is hardware teardown and rather interesting and the only point we could
> > actually do something. Can you figure out what takes so long here?
> 
> I’ll try to figure that out.

I increased the maximum depth to 10, and according to the trace the loop in
`gfx_v9_0_enter_rlc_safe_mode()` is the culprit. Also, in all the function is
called three times.

static void gfx_v9_0_enter_rlc_safe_mode(struct amdgpu_device *adev)
{
        uint32_t rlc_setting, data;
        unsigned i;

        if (adev->gfx.rlc.in_safe_mode)
                return;

        /* if RLC is not enabled, do nothing */
        rlc_setting = RREG32_SOC15(GC, 0, mmRLC_CNTL);
        if (!(rlc_setting & RLC_CNTL__RLC_ENABLE_F32_MASK))
                return;

        if (adev->cg_flags &
            (AMD_CG_SUPPORT_GFX_CGCG | AMD_CG_SUPPORT_GFX_MGCG |
             AMD_CG_SUPPORT_GFX_3D_CGCG)) {
                data = RLC_SAFE_MODE__CMD_MASK;
                data |= (1 << RLC_SAFE_MODE__MESSAGE__SHIFT);
                WREG32_SOC15(GC, 0, mmRLC_SAFE_MODE, data);

                /* wait for RLC_SAFE_MODE */
                for (i = 0; i < adev->usec_timeout; i++) {
                        if (!REG_GET_FIELD(SOC15_REG_OFFSET(GC, 0,
mmRLC_SAFE_MODE), RLC_SAFE_MODE, CMD))
                                break;
                        udelay(1);
                }
                adev->gfx.rlc.in_safe_mode = true;
        }
}

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