本文共 17579 字，大约阅读时间需要 58 分钟。
直接贴代码,
907 void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state) 908 { 909 › struct vb2_queue *q = vb->vb2_queue; 910 › unsigned long flags; 911 › unsigned int plane; 912 913 › if (WARN_ON(vb->state != VB2_BUF_STATE_ACTIVE)) 914 › › return; 915 916 › if (WARN_ON(state != VB2_BUF_STATE_DONE && 917 › › state != VB2_BUF_STATE_ERROR && 918 › › state != VB2_BUF_STATE_QUEUED && 919 › › state != VB2_BUF_STATE_REQUEUEING)) 920 › › state = VB2_BUF_STATE_ERROR; 921 922 #ifdef CONFIG_VIDEO_ADV_DEBUG 923 › /* 924 › * Although this is not a callback, it still does have to balance 925 › * with the buf_queue op. So update this counter manually. 926 › */ 927 › vb->cnt_buf_done++; 928 #endif 929 › dprintk(4, "done processing on buffer %d, state: %d\n", 930 › › › vb->index, state); 931 932 › if (state != VB2_BUF_STATE_QUEUED && 933 › state != VB2_BUF_STATE_REQUEUEING) { 934 › › /* sync buffers */ 935 › › for (plane = 0; plane < vb->num_planes; ++plane) 936 › › › call_void_memop(vb, finish, vb->planes[plane].mem_priv); 937 › › vb->synced = false; 938 › } 939 940 › spin_lock_irqsave(&q->done_lock, flags); 941 › if (state == VB2_BUF_STATE_QUEUED || 942 › state == VB2_BUF_STATE_REQUEUEING) { 943 › › vb->state = VB2_BUF_STATE_QUEUED; 944 › } else { 945 › › /* Add the buffer to the done buffers list */ 946 › › list_add_tail(&vb->done_entry, &q->done_list); 947 › › vb->state = state; 948 › } 949 › atomic_dec(&q->owned_by_drv_count); 950 951 › if (state != VB2_BUF_STATE_QUEUED && vb->req_obj.req) { 952 › › /* This is not supported at the moment */ 953 › › WARN_ON(state == VB2_BUF_STATE_REQUEUEING); 954 › › media_request_object_unbind(&vb->req_obj); 955 › › media_request_object_put(&vb->req_obj); 956 › } 957 958 › spin_unlock_irqrestore(&q->done_lock, flags); 959 960 › trace_vb2_buf_done(q, vb); 961 962 › switch (state) { 963 › case VB2_BUF_STATE_QUEUED: 964 › › return; 965 › case VB2_BUF_STATE_REQUEUEING: 966 › › if (q->start_streaming_called) 967 › › › __enqueue_in_driver(vb); 968 › › return; 969 › default: 970 › › /* Inform any processes that may be waiting for buffers */ 971 › › wake_up(&q->done_wq); 972 › › break; 973 › } 974 }
主要干一件事情, queued_list中的buffer处理后, 需要放到done_list中。
谁来做这个动作。不是v4l2核心层, 而是具体的驱动如vivi, uvc, coda等。
如何放入done_list,
请调用vb2_buffer_done!!
具体细节, 后续研究并添加...
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