drm/amdgpu: Fix S3 test issue

During S3 test, when system wake up and resume, ras interface
is already allocated. Move workaround before ras jumps to resume
step in gfx_v9_0_ecc_late_init, and make sure workaround applied
during resume. Also remove unused mmGB_EDC_MODE clearing.
Signed-off-by: James Zhu <James.Zhu@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c

@@ -3632,7 +3632,6 @@ static int gfx_v9_0_do_edc_gpr_workarounds(struct amdgpu_device *adev)
 	struct amdgpu_ib ib;
 	struct dma_fence *f = NULL;
 	int r, i, j;
-	u32 tmp;
 	unsigned total_size, vgpr_offset, sgpr_offset;
 	u64 gpu_addr;
 
@@ -3644,9 +3643,6 @@ static int gfx_v9_0_do_edc_gpr_workarounds(struct amdgpu_device *adev)
 	if (!ring->sched.ready)
 		return 0;
 
-	tmp = RREG32_SOC15(GC, 0, mmGB_EDC_MODE);
-	WREG32_SOC15(GC, 0, mmGB_EDC_MODE, 0);
-
 	total_size =
 		((ARRAY_SIZE(vgpr_init_regs) * 3) + 4 + 5 + 2) * 4;
 	total_size +=
@@ -3812,6 +3808,11 @@ static int gfx_v9_0_ecc_late_init(void *handle)
 		return 0;
 	}
 
+	/* requires IBs so do in late init after IB pool is initialized */
+	r = gfx_v9_0_do_edc_gpr_workarounds(adev);
+	if (r)
+		return r;
+
 	if (*ras_if)
 		goto resume;
 
@@ -3819,11 +3820,6 @@ static int gfx_v9_0_ecc_late_init(void *handle)
 	if (!*ras_if)
 		return -ENOMEM;
 
-	/* requires IBs so do in late init after IB pool is initialized */
-	r = gfx_v9_0_do_edc_gpr_workarounds(adev);
-	if (r)
-		return r;
-
 	**ras_if = ras_block;
 
 	r = amdgpu_ras_feature_enable_on_boot(adev, *ras_if, 1);