drm/amd/pm: skip setting gfx cgpg in the s0ix suspend-resume

In the s0ix entry need retain gfx in the gfxoff state,so here need't
set gfx cgpg in the S0ix suspend-resume process. Moreover move the S0ix
check into SMU12 can simplify the code condition check.

Signed-off-by: Prike Liang <Prike.Liang@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1569,8 +1569,6 @@ static int smu_suspend(void *handle)
 
 	smu->watermarks_bitmap &= ~(WATERMARKS_LOADED);
 
-	/* skip CGPG when in S0ix */
-	if (smu->is_apu && !adev->in_s0ix)
 	smu_set_gfx_cgpg(&adev->smu, false);
 
 	return 0;
@@ -1602,7 +1600,6 @@ static int smu_resume(void *handle)
 		return ret;
 	}
 
-	if (smu->is_apu)
 	smu_set_gfx_cgpg(&adev->smu, true);
 
 	smu->disable_uclk_switch = 0;

drivers/gpu/drm/amd/pm/swsmu/smu12/smu_v12_0.c

@@ -120,7 +120,8 @@ int smu_v12_0_powergate_sdma(struct smu_context *smu, bool gate)
 
 int smu_v12_0_set_gfx_cgpg(struct smu_context *smu, bool enable)
 {
-	if (!(smu->adev->pg_flags & AMD_PG_SUPPORT_GFX_PG))
+	/* Until now the SMU12 only implemented for Renoir series so here neen't do APU check. */
+	if (!(smu->adev->pg_flags & AMD_PG_SUPPORT_GFX_PG) || smu->adev->in_s0ix)
 		return 0;
 
 	return smu_cmn_send_smc_msg_with_param(smu,