drm/amdgpu: Add query vram width in CGS query system info

powerplay need vram width to set default mclk optimization
settings(uphyst/downhyst/activity threshold)
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -905,6 +905,9 @@ static int amdgpu_cgs_query_system_info(struct cgs_device *cgs_device,
 	case CGS_SYSTEM_INFO_PCIE_BUS_DEVFN:
 		sys_info->value = adev->pdev->devfn;
 		break;
+	case CGS_SYSTEM_INFO_VRAM_WIDTH:
+		sys_info->value = adev->gmc.vram_width;
+		break;
 	default:
 		return -ENODEV;
 	}

drivers/gpu/drm/amd/include/cgs_common.h

@@ -101,6 +101,7 @@ enum cgs_system_info_id {
 	CGS_SYSTEM_INFO_PCIE_SUB_SYS_ID,
 	CGS_SYSTEM_INFO_PCIE_SUB_SYS_VENDOR_ID,
 	CGS_SYSTEM_INFO_PCIE_BUS_DEVFN,
+	CGS_SYSTEM_INFO_VRAM_WIDTH,
 	CGS_SYSTEM_INFO_ID_MAXIMUM,
 };