drm/xe: Add skip_guc_pc flag

This flag can be used to disable GuC based power management. This
could be used for debug or comparison to host based C6.

v2: Fix missing definition
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_device_types.h

@@ -264,6 +264,8 @@ struct xe_device {
 		u8 supports_mmio_ext:1;
 		/** @has_heci_gscfi: device has heci gscfi */
 		u8 has_heci_gscfi:1;
+		/** @skip_guc_pc: Skip GuC based PM feature init */
+		u8 skip_guc_pc:1;
 
 #if IS_ENABLED(CONFIG_DRM_XE_DISPLAY)
 		struct {

drivers/gpu/drm/xe/xe_pci.c

@@ -64,6 +64,7 @@ struct xe_device_desc {
 	u8 has_sriov:1;
 	u8 bypass_mtcfg:1;
 	u8 supports_mmio_ext:1;
+	u8 skip_guc_pc:1;
 };
 
 __diag_push();
@@ -591,6 +592,7 @@ static int xe_info_init(struct xe_device *xe,
 	xe->info.has_asid = graphics_desc->has_asid;
 	xe->info.has_flat_ccs = graphics_desc->has_flat_ccs;
 	xe->info.has_range_tlb_invalidation = graphics_desc->has_range_tlb_invalidation;
+	xe->info.skip_guc_pc = desc->skip_guc_pc;
 
 	xe->info.enable_display = IS_ENABLED(CONFIG_DRM_XE_DISPLAY) &&
 				  xe_modparam.enable_display &&