diff mbox

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

Message ID 1475112091-28120-1-git-send-email-songjun.wu@microchip.com (mailing list archive)
State New, archived
Headers show

Commit Message

Songjun Wu Sept. 29, 2016, 1:21 a.m. UTC
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>
---

 drivers/media/platform/atmel/atmel-isc.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/media/platform/atmel/atmel-isc.c b/drivers/media/platform/atmel/atmel-isc.c
index ccfe13b..ff403d5 100644
--- a/drivers/media/platform/atmel/atmel-isc.c
+++ b/drivers/media/platform/atmel/atmel-isc.c
@@ -617,7 +617,14 @@  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);
 }