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drm/amdgpu/gfx6: Use COND_EXEC
COND_EXEC tells the CP to discard the dwords following it when its condition is zero (false). This is useful for GPU recovery because it can help reduce collateral damage during GFX IP block soft reset, meaning that it reduces the likelyhood that we fail some jobs which are not guilty of the hang as the IP block soft reset mechanism clears the condition before doing the reset. Note that this packet is only 4 DW on GFX6 (as opposed to GFX7 and newer where it's 5 DW). Signed-off-by: Timur Kristóf <timur.kristof@gmail.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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