drm/amdgpu: add reset_method asic callback for si

SI always uses the legacy pci based reset.
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1186,6 +1186,12 @@ static int si_asic_reset(struct amdgpu_device *adev)
 	return 0;
 }
 
+static enum amd_reset_method
+si_asic_reset_method(struct amdgpu_device *adev)
+{
+	return AMD_RESET_METHOD_LEGACY;
+}
+
 static u32 si_get_config_memsize(struct amdgpu_device *adev)
 {
 	return RREG32(mmCONFIG_MEMSIZE);
@@ -1394,6 +1400,7 @@ static const struct amdgpu_asic_funcs si_asic_funcs =
 	.read_bios_from_rom = &si_read_bios_from_rom,
 	.read_register = &si_read_register,
 	.reset = &si_asic_reset,
+	.reset_method = &si_asic_reset_method,
 	.set_vga_state = &si_vga_set_state,
 	.get_xclk = &si_get_xclk,
 	.set_uvd_clocks = &si_set_uvd_clocks,