drm/amdgpu: add HDP asic callbacks for VI

Needed to flush and invalidate the HDP block using the CPU.
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Samuel Li <Samuel.Li@amd.com>

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

@@ -856,6 +856,18 @@ static uint32_t vi_get_rev_id(struct amdgpu_device *adev)
 			>> PCIE_EFUSE4__STRAP_BIF_ATI_REV_ID__SHIFT;
 }
 
+static void vi_flush_hdp(struct amdgpu_device *adev)
+{
+	WREG32(mmHDP_MEM_COHERENCY_FLUSH_CNTL, 1);
+	RREG32(mmHDP_MEM_COHERENCY_FLUSH_CNTL);
+}
+
+static void vi_invalidate_hdp(struct amdgpu_device *adev)
+{
+	WREG32(mmHDP_DEBUG0, 1);
+	RREG32(mmHDP_DEBUG0);
+}
+
 static const struct amdgpu_asic_funcs vi_asic_funcs =
 {
 	.read_disabled_bios = &vi_read_disabled_bios,
@@ -867,6 +879,8 @@ static const struct amdgpu_asic_funcs vi_asic_funcs =
 	.set_uvd_clocks = &vi_set_uvd_clocks,
 	.set_vce_clocks = &vi_set_vce_clocks,
 	.get_config_memsize = &vi_get_config_memsize,
+	.flush_hdp = &vi_flush_hdp,
+	.invalidate_hdp = &vi_invalidate_hdp,
 };
 
 #define CZ_REV_BRISTOL(rev)	 \