[PATCH] drm/amdgpu: only remap HDP registers on X86_64

[Alexey Klimov]

On Thu Apr 24, 2025 at 6:58 PM BST, Alex Deucher wrote:
> We remap the HDP registers to an open part of the MMIO
> aperture.  This doesn't seem to work properly on non-X86 systems,
> so only remap on X86_64.
>
> Fixes: c9b8dcabb52a ("drm/amdgpu/hdp4.0: do a posting read when flushing HDP")
> Fixes: cf424020e040 ("drm/amdgpu/hdp5.0: do a posting read when flushing HDP")
> Fixes: f756dbac1ce1 ("drm/amdgpu/hdp5.2: do a posting read when flushing HDP")
> Fixes: abe1cbaec6cf ("drm/amdgpu/hdp6.0: do a posting read when flushing HDP")
> Fixes: 689275140cb8 ("drm/amdgpu/hdp7.0: do a posting read when flushing HDP")
> Reported-by: Alexey Klimov <alexey.klimov at linaro.org>
> Link: https://lists.freedesktop.org/archives/amd-gfx/2025-April/123150.html
> Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4119
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

Tested-by: Alexey Klimov <alexey.klimov at linaro.org>

Maybe also makes sense to c/c stable since the posting read patches
are taken by distro kernels already.

Thank you for fixing this.

Best regards,
Alexey