drm/amdgpu: add burst_nop flag for sdma

The burst NOP is supported for SDMA when feature_version is >= 20.
Signed-off-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -1708,6 +1708,7 @@ struct amdgpu_sdma {
 	uint32_t		feature_version;
 
 	struct amdgpu_ring	ring;
+	bool			burst_nop;
 };
 
 /*

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

@@ -501,6 +501,8 @@ static int cik_sdma_load_microcode(struct amdgpu_device *adev)
 		fw_size = le32_to_cpu(hdr->header.ucode_size_bytes) / 4;
 		adev->sdma[i].fw_version = le32_to_cpu(hdr->header.ucode_version);
 		adev->sdma[i].feature_version = le32_to_cpu(hdr->ucode_feature_version);
+		if (adev->sdma[i].feature_version >= 20)
+			adev->sdma[i].burst_nop = true;
 		fw_data = (const __le32 *)
 			(adev->sdma[i].fw->data + le32_to_cpu(hdr->header.ucode_array_offset_bytes));
 		WREG32(mmSDMA0_UCODE_ADDR + sdma_offsets[i], 0);

drivers/gpu/drm/amd/amdgpu/sdma_v2_4.c

@@ -146,6 +146,8 @@ static int sdma_v2_4_init_microcode(struct amdgpu_device *adev)
 		hdr = (const struct sdma_firmware_header_v1_0 *)adev->sdma[i].fw->data;
 		adev->sdma[i].fw_version = le32_to_cpu(hdr->header.ucode_version);
 		adev->sdma[i].feature_version = le32_to_cpu(hdr->ucode_feature_version);
+		if (adev->sdma[i].feature_version >= 20)
+			adev->sdma[i].burst_nop = true;
 
 		if (adev->firmware.smu_load) {
 			info = &adev->firmware.ucode[AMDGPU_UCODE_ID_SDMA0 + i];

drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c

@@ -218,6 +218,8 @@ static int sdma_v3_0_init_microcode(struct amdgpu_device *adev)
 		hdr = (const struct sdma_firmware_header_v1_0 *)adev->sdma[i].fw->data;
 		adev->sdma[i].fw_version = le32_to_cpu(hdr->header.ucode_version);
 		adev->sdma[i].feature_version = le32_to_cpu(hdr->ucode_feature_version);
+		if (adev->sdma[i].feature_version >= 20)
+			adev->sdma[i].burst_nop = true;
 
 		if (adev->firmware.smu_load) {
 			info = &adev->firmware.ucode[AMDGPU_UCODE_ID_SDMA0 + i];