From: Ezequiel Garcia Date: Fri, 15 Jun 2018 19:07:30 +0000 (-0400) Subject: media: mx_emmaprp: Implement wait_prepare and wait_finish X-Git-Tag: v4.19-rc1~137^2~303 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=a4273abcd3e40f7e8fe9c5347dea1e0a6b9ccadb;p=linux.git media: mx_emmaprp: Implement wait_prepare and wait_finish This driver is currently specifying a video_device lock, which means it is protecting all the ioctls (including queue ioctls) with a single mutex. It's therefore straightforward to implement wait_prepare and wait_finish, by explicitly setting the vb2_queue lock. Having these callbacks releases the queue lock while blocking, which improves latency by allowing for example streamoff or qbuf operations while waiting in dqbuf. Signed-off-by: Ezequiel Garcia Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/platform/mx2_emmaprp.c b/drivers/media/platform/mx2_emmaprp.c index 83b9db895a64..64195c4ddeaf 100644 --- a/drivers/media/platform/mx2_emmaprp.c +++ b/drivers/media/platform/mx2_emmaprp.c @@ -733,6 +733,8 @@ static const struct vb2_ops emmaprp_qops = { .queue_setup = emmaprp_queue_setup, .buf_prepare = emmaprp_buf_prepare, .buf_queue = emmaprp_buf_queue, + .wait_prepare = vb2_ops_wait_prepare, + .wait_finish = vb2_ops_wait_finish, }; static int queue_init(void *priv, struct vb2_queue *src_vq, @@ -749,6 +751,7 @@ static int queue_init(void *priv, struct vb2_queue *src_vq, src_vq->mem_ops = &vb2_dma_contig_memops; src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY; src_vq->dev = ctx->dev->v4l2_dev.dev; + src_vq->lock = &ctx->dev->dev_mutex; ret = vb2_queue_init(src_vq); if (ret) @@ -762,6 +765,7 @@ static int queue_init(void *priv, struct vb2_queue *src_vq, dst_vq->mem_ops = &vb2_dma_contig_memops; dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY; dst_vq->dev = ctx->dev->v4l2_dev.dev; + dst_vq->lock = &ctx->dev->dev_mutex; return vb2_queue_init(dst_vq); }