From fa8bbe0a8567bf4eb87e82739465360a6797c91b Mon Sep 17 00:00:00 2001 From: Songjun Wu Date: Wed, 28 Sep 2016 02:28:57 -0300 Subject: [PATCH] [media] atmel-isc: start dma in some scenario If a new vb buf is added to vb queue, the queue is empty and steaming, dma should be started. Signed-off-by: Songjun Wu Signed-off-by: Mauro Carvalho Chehab --- drivers/media/platform/atmel/atmel-isc.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/media/platform/atmel/atmel-isc.c b/drivers/media/platform/atmel/atmel-isc.c index ccfe13b7d3f8..8e25d3f56438 100644 --- a/drivers/media/platform/atmel/atmel-isc.c +++ b/drivers/media/platform/atmel/atmel-isc.c @@ -617,7 +617,13 @@ static void isc_buffer_queue(struct vb2_buffer *vb) unsigned long flags; spin_lock_irqsave(&isc->dma_queue_lock, flags); - list_add_tail(&buf->list, &isc->dma_queue); + if (!isc->cur_frm && list_empty(&isc->dma_queue) && + vb2_is_streaming(vb->vb2_queue)) { + isc->cur_frm = buf; + isc_start_dma(isc->regmap, isc->cur_frm, + isc->current_fmt->reg_dctrl_dview); + } else + list_add_tail(&buf->list, &isc->dma_queue); spin_unlock_irqrestore(&isc->dma_queue_lock, flags); } -- 2.39.5