drm/amdgpu: Enabling FW workaround through shared memory for VCN4_0_2

This patch will enable VCN FW workaround using
DRM KEY INJECT WORKAROUND method,
which is helping in fixing the secure playback.
Signed-off-by: sguttula <Suresh.Guttula@amd.com>
Reviewed-by: Leo Liu <leo.liiu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -161,6 +161,7 @@
 	} while (0)
 
 #define AMDGPU_FW_SHARED_FLAG_0_UNIFIED_QUEUE (1 << 2)
+#define AMDGPU_FW_SHARED_FLAG_0_DRM_KEY_INJECT (1 << 4)
 #define AMDGPU_VCN_FW_SHARED_FLAG_0_RB	(1 << 6)
 #define AMDGPU_VCN_MULTI_QUEUE_FLAG	(1 << 8)
 #define AMDGPU_VCN_SW_RING_FLAG		(1 << 9)
@@ -180,6 +181,8 @@
 #define AMDGPU_VCN_SMU_DPM_INTERFACE_DGPU (0)
 #define AMDGPU_VCN_SMU_DPM_INTERFACE_APU (1)
 
+#define AMDGPU_DRM_KEY_INJECT_WORKAROUND_VCNFW_ASD_HANDSHAKING 2
+
 enum fw_queue_mode {
 	FW_QUEUE_RING_RESET = 1,
 	FW_QUEUE_DPG_HOLD_OFF = 2,
@@ -343,6 +346,11 @@ struct amdgpu_fw_shared_rb_setup {
 	uint32_t  reserved[6];
 };
 
+struct amdgpu_fw_shared_drm_key_wa {
+	uint8_t  method;
+	uint8_t  reserved[3];
+};
+
 struct amdgpu_vcn4_fw_shared {
 	uint32_t present_flag_0;
 	uint8_t pad[12];
@@ -352,6 +360,7 @@ struct amdgpu_vcn4_fw_shared {
 	uint8_t pad2[20];
 	struct amdgpu_fw_shared_rb_setup rb_setup;
 	struct amdgpu_fw_shared_smu_interface_info smu_dpm_interface;
+	struct amdgpu_fw_shared_drm_key_wa drm_key_wa;
 };
 
 struct amdgpu_vcn_fwlog {

drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c

@@ -169,6 +169,12 @@ static int vcn_v4_0_sw_init(void *handle)
 		fw_shared->smu_dpm_interface.smu_interface_type = (adev->flags & AMD_IS_APU) ?
 			AMDGPU_VCN_SMU_DPM_INTERFACE_APU : AMDGPU_VCN_SMU_DPM_INTERFACE_DGPU;
 
+		if (adev->ip_versions[VCN_HWIP][0] == IP_VERSION(4, 0, 2)) {
+			fw_shared->present_flag_0 |= AMDGPU_FW_SHARED_FLAG_0_DRM_KEY_INJECT;
+			fw_shared->drm_key_wa.method =
+				AMDGPU_DRM_KEY_INJECT_WORKAROUND_VCNFW_ASD_HANDSHAKING;
+		}
+
 		if (amdgpu_sriov_vf(adev))
 			fw_shared->present_flag_0 |= cpu_to_le32(AMDGPU_VCN_VF_RB_SETUP_FLAG);