drm/amd/pm: Allocate dummy table only if needed

Only Navi1x requires dummy read workaround. Allocate the table in VRAM
only for Navi1x.
Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c

@@ -904,9 +904,8 @@ static int smu_alloc_dummy_read_table(struct smu_context *smu)
 	struct amdgpu_device *adev = smu->adev;
 	int ret = 0;
 
-	dummy_read_1_table->size = 0x40000;
-	dummy_read_1_table->align = PAGE_SIZE;
-	dummy_read_1_table->domain = AMDGPU_GEM_DOMAIN_VRAM;
+	if (!dummy_read_1_table->size)
+		return 0;
 
 	ret = amdgpu_bo_create_kernel(adev,
 				      dummy_read_1_table->size,

drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c

@@ -494,6 +494,8 @@ static int navi10_tables_init(struct smu_context *smu)
 {
 	struct smu_table_context *smu_table = &smu->smu_table;
 	struct smu_table *tables = smu_table->tables;
+	struct smu_table *dummy_read_1_table =
+			&smu_table->dummy_read_1_table;
 
 	SMU_TABLE_INIT(tables, SMU_TABLE_PPTABLE, sizeof(PPTable_t),
 		       PAGE_SIZE, AMDGPU_GEM_DOMAIN_VRAM);
@@ -513,6 +515,10 @@ static int navi10_tables_init(struct smu_context *smu)
 	SMU_TABLE_INIT(tables, SMU_TABLE_DRIVER_SMU_CONFIG, sizeof(DriverSmuConfig_t),
 		       PAGE_SIZE, AMDGPU_GEM_DOMAIN_VRAM);
 
+	dummy_read_1_table->size = 0x40000;
+	dummy_read_1_table->align = PAGE_SIZE;
+	dummy_read_1_table->domain = AMDGPU_GEM_DOMAIN_VRAM;
+
 	smu_table->metrics_table = kzalloc(sizeof(SmuMetrics_NV1X_t),
 					   GFP_KERNEL);
 	if (!smu_table->metrics_table)