drm/amd/include: Add mmhub 9.4 reg offsets and shift-mask

In particular, we need the mmMC_VM_XGMI_LFB_CNTL register, for
determining if xGMI is enabled on VG20. This will be used by DC to
determine the correct spread spectrum adjustment for display and audio
clocks.

Reviewed-by: Alex Deucher <[e-mail]>
Signed-off-by: Leo Li <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/include/asic_reg/mmhub/mmhub_9_4_0_offset.h

···
+/*
+ * Copyright (C) 2018  Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef _mmhub_9_4_0_OFFSET_HEADER
+#define _mmhub_9_4_0_OFFSET_HEADER
+
+
+// addressBlock: mmhub_utcl2_vmsharedpfdec
+// base address: 0x6a040
+#define mmMC_VM_XGMI_LFB_CNTL                                                                          0x0823
+#define mmMC_VM_XGMI_LFB_CNTL_BASE_IDX                                                                 0
+#define mmMC_VM_XGMI_LFB_SIZE                                                                          0x0824
+#define mmMC_VM_XGMI_LFB_SIZE_BASE_IDX                                                                 0
+
+#endif

drivers/gpu/drm/amd/include/asic_reg/mmhub/mmhub_9_4_0_sh_mask.h

···
+/*
+ * Copyright (C) 2018  Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef _mmhub_9_4_0_SH_MASK_HEADER
+#define _mmhub_9_4_0_SH_MASK_HEADER
+
+
+// addressBlock: mmhub_utcl2_vmsharedpfdec
+//MC_VM_XGMI_LFB_CNTL
+#define MC_VM_XGMI_LFB_CNTL__PF_LFB_REGION__SHIFT                                                             0x0
+#define MC_VM_XGMI_LFB_CNTL__PF_MAX_REGION__SHIFT                                                             0x4
+#define MC_VM_XGMI_LFB_CNTL__PF_LFB_REGION_MASK                                                               0x00000007L
+#define MC_VM_XGMI_LFB_CNTL__PF_MAX_REGION_MASK                                                               0x00000070L
+//MC_VM_XGMI_LFB_SIZE
+#define MC_VM_XGMI_LFB_SIZE__PF_LFB_SIZE__SHIFT                                                               0x0
+#define MC_VM_XGMI_LFB_SIZE__PF_LFB_SIZE_MASK                                                                 0x0000FFFFL
+
+#endif