drm/amdgpu: disable MCBP by default

[ Upstream commit d6a57588666301acd9d42d3b00d74240964f07f6 ]

Disable MCBP(mid command buffer preemption) by default as old Mesa
hangs with it. We shall not enable the feature that breaks old usermode
driver.

Fixes: 50a7c8765ca6 ("drm/amdgpu: enable mcbp by default on gfx9")
Signed-off-by: Jiadong Zhu <Jiadong.Zhu@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index a164857..94e9151 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -3478,10 +3478,6 @@ static void amdgpu_device_set_mcbp(struct amdgpu_device *adev)
                adev->gfx.mcbp = true;
        else if (amdgpu_mcbp == 0)
                adev->gfx.mcbp = false;
-       else if ((adev->ip_versions[GC_HWIP][0] >= IP_VERSION(9, 0, 0)) &&
-                (adev->ip_versions[GC_HWIP][0] < IP_VERSION(10, 0, 0)) &&
-                adev->gfx.num_gfx_rings)
-               adev->gfx.mcbp = true;
 
        if (amdgpu_sriov_vf(adev))
                adev->gfx.mcbp = true;