From: Alex Deucher Date: Tue, 16 Mar 2021 18:00:36 +0000 (-0400) Subject: drm/amdgpu: update comments about s0ix suspend/resume X-Git-Tag: accepted/tizen/unified/20230118.172025~7243^2~10^2~190 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=32ff160da7ffc707e3bccfe1fdd3711ac2246164;p=platform%2Fkernel%2Flinux-rpi.git drm/amdgpu: update comments about s0ix suspend/resume Provide and explanation as to why we skip GFX and PSP for S0ix. GFX goes into gfxoff, same as runtime, so no need to tear down and re-init. PSP is part of the always on state, so no need to touch it. Acked-by: Evan Quan Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index 5ec9b87..5796331 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -2754,10 +2754,14 @@ static int amdgpu_device_ip_suspend_phase2(struct amdgpu_device *adev) continue; } - /* XXX fix these remaining cases */ + /* skip suspend of gfx and psp for S0ix + * gfx is in gfxoff state, so on resume it will exit gfxoff just + * like at runtime. PSP is also part of the always on hardware + * so no need to suspend it. + */ if (adev->in_s0ix && - (adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_PSP || /* breaks resume */ - adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_GFX)) /* breaks suspend */ + (adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_PSP || + adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_GFX)) continue; /* XXX handle errors */