[PATCH 3/3] drm/amd: Add safety check to make sure RLC is only turned off while in GFXOFF

[Mario Limonciello]

On GFX11 if RLC is stopped when not in GFXOFF the system will hang.
Prevent this case from ever happening.

Tested-by: Juan Martinez <juan.marti...@amd.com>
Signed-off-by: Mario Limonciello <mario.limoncie...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c 
b/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
index dcbdb2641086..f1f879d9ed8d 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
@@ -1766,6 +1766,10 @@ static void gfx_v11_0_rlc_stop(struct amdgpu_device 
*adev)
 {
        u32 tmp = RREG32_SOC15(GC, 0, regRLC_CNTL);
 
+       if (!adev->gfx.gfx_off_state) {
+               dev_err(adev->dev, "GFX is not in GFXOFF\n");
+               return;
+       }
        tmp = REG_SET_FIELD(tmp, RLC_CNTL, RLC_ENABLE_F32, 0);
        WREG32_SOC15(GC, 0, regRLC_CNTL, tmp);
 }
-- 
2.34.1