drm/amdgpu: add an asic callback to determine the reset method

Sometimes the driver may have to behave differently depending
on the method we are using to reset the GPU.
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -532,6 +532,14 @@ struct amdgpu_allowed_register_entry {
 	bool grbm_indexed;
 };
 
+enum amd_reset_method {
+	AMD_RESET_METHOD_LEGACY = 0,
+	AMD_RESET_METHOD_MODE0,
+	AMD_RESET_METHOD_MODE1,
+	AMD_RESET_METHOD_MODE2,
+	AMD_RESET_METHOD_BACO
+};
+
 /*
  * ASIC specific functions.
  */
@@ -543,6 +551,7 @@ struct amdgpu_asic_funcs {
 			     u32 sh_num, u32 reg_offset, u32 *value);
 	void (*set_vga_state)(struct amdgpu_device *adev, bool state);
 	int (*reset)(struct amdgpu_device *adev);
+	enum amd_reset_method (*reset_method)(struct amdgpu_device *adev);
 	/* get the reference clock */
 	u32 (*get_xclk)(struct amdgpu_device *adev);
 	/* MM block clocks */
@@ -1109,6 +1118,7 @@ int emu_soc_asic_init(struct amdgpu_device *adev);
  */
 #define amdgpu_asic_set_vga_state(adev, state) (adev)->asic_funcs->set_vga_state((adev), (state))
 #define amdgpu_asic_reset(adev) (adev)->asic_funcs->reset((adev))
+#define amdgpu_asic_reset_method(adev) (adev)->asic_funcs->reset_method((adev))
 #define amdgpu_asic_get_xclk(adev) (adev)->asic_funcs->get_xclk((adev))
 #define amdgpu_asic_set_uvd_clocks(adev, v, d) (adev)->asic_funcs->set_uvd_clocks((adev), (v), (d))
 #define amdgpu_asic_set_vce_clocks(adev, ev, ec) (adev)->asic_funcs->set_vce_clocks((adev), (ev), (ec))