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[media] atmel-isc: start dma in some scenario

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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 <songjun.wu@microchip.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Songjun Wu 2016-09-28 02:28:57 -03:00 committed by Mauro Carvalho Chehab
parent 37e90a220a
commit fa8bbe0a85
1 changed files with 7 additions and 1 deletions
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8
drivers/media/platform/atmel/atmel-isc.c
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@ -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);
}