drm/amd/pm: enable DCS

Enable DCS

V1: Enable Async DCS.
V2: Add the ppfeaturemask bit to enable from the modprobe parameter.
V3:
1. add the flag to skip APU support.
2. remove the hunk for workload selection since
it doesn't impact the function.

Signed-off-by: Kenneth Feng <[e-mail]>
Acked-by: Alex Deucher <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 uint amdgpu_sdma_phase_quantum = 32;
 char *amdgpu_disable_cu = NULL;
 char *amdgpu_virtual_display = NULL;
-/* OverDrive(bit 14) disabled by default*/
-uint amdgpu_pp_feature_mask = 0xffffbfff;
+
+/*
+ * OverDrive(bit 14) disabled by default
+ * GFX DCS(bit 19) disabled by default
+ */
+uint amdgpu_pp_feature_mask = 0xfff7bfff;
 uint amdgpu_force_long_training;
 int amdgpu_job_hang_limit;
 int amdgpu_lbpw = -1;

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

···
 	PP_ACG_MASK = 0x10000,
 	PP_STUTTER_MODE = 0x20000,
 	PP_AVFS_MASK = 0x40000,
+	PP_GFX_DCS_MASK = 0x80000,
 };
 
 enum DC_FEATURE_MASK {

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

···
 		*(uint64_t *)feature_mask |= FEATURE_MASK(FEATURE_DPM_GFX_GPO_BIT);
 	}
 
+	if ((adev->pm.pp_feature & PP_GFX_DCS_MASK) &&
+	    (adev->asic_type > CHIP_SIENNA_CICHLID) &&
+	    !(adev->flags & AMD_IS_APU))
+		*(uint64_t *)feature_mask |= FEATURE_MASK(FEATURE_GFX_DCS_BIT);
+
 	if (adev->pm.pp_feature & PP_MCLK_DPM_MASK)
 		*(uint64_t *)feature_mask |= FEATURE_MASK(FEATURE_DPM_UCLK_BIT)
 					| FEATURE_MASK(FEATURE_MEM_VDDCI_SCALING_BIT)