drm/amdgpu: reset CIK ASIC on Apple boards with VRAM at 0

On MacBookPros with switchable graphics, the firmware puts VRAM at MC
address 0 when the iGPU is enabled.  A later post (S3 resume, GPU
reset) moves VRAM back to the VBIOS default.  The SI fix resets and
posts the ASIC at load, so the driver uses the VBIOS layout from the
start:

  "drm/amdgpu: reset SI ASIC on MacBookPros with VRAM at 0"

No MacBookPro has a CIK GPU, and no affected CIK board is known.  Add
the same test to cik_need_reset_on_init(), so that SI, CIK and VI
handle this firmware layout in the same way.  gmc_v7_0 reads
MC_VM_FB_LOCATION once at init and does not reprogram it.  A CIK board
with VRAM at 0 therefore has the same problem as the SI boards.

After the reset, FB_BASE is not 0, so the new test does not fire again
on a module reload.

Only compile-tested.

Suggested-by: Alex Deucher <alexander.deucher@amd.com>
Assisted-by: Claude:claude-opus-5-5
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Maciej Kucharek <qchcio@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 6bb4b79d6a6c461b40750fd67cb4e2a070e20b67)
Cc: stable@vger.kernel.org

0 files changed, 0 insertions, 0 deletions