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Message-ID: <1475112091-28120-1-git-send-email-songjun.wu@microchip.com>
Date: Thu, 29 Sep 2016 09:21:31 +0800
From: Songjun Wu <songjun.wu@...rochip.com>
To: Nicolas Ferre <nicolas.ferre@...rochip.com>,
Hans Verkuil <hans.verkuil@...co.com>
CC: <linux-arm-kernel@...ts.infradead.org>,
Songjun Wu <songjun.wu@...rochip.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
<linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>
Subject: [RESEND][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 <songjun.wu@...rochip.com>
---
drivers/media/platform/atmel/atmel-isc.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
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);
}
--
2.7.4
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