drm/amdgpu: add emit_reg_write_reg_wait ring callback

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This callback writes a value to a register and then reads
back another register and waits for a value in a single
operation.

Provide a helper function using two operations for engines
that don't support this opertion.

Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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This commit is contained in:

Alex Deucher 2018-03-27 11:58:14 -05:00

parent 9da0063018

commit 828536385a

3 changed files with 28 additions and 0 deletions

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1

drivers/gpu/drm/amd/amdgpu/amdgpu.h

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20

drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c

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7

drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h

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