linux-kernel - [PATCH v4 01/11] media: atmel: atmel-isc: replace 'stop' variable with vb2 calls

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Date:   Fri, 21 Jan 2022 15:14:06 +0200
From:   Eugen Hristev <eugen.hristev@...rochip.com>
To:     <robh+dt@...nel.org>, <linux-media@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <jacopo+renesas@...ndi.org>, <hverkuil-cisco@...all.nl>
CC:     <nicolas.ferre@...rochip.com>, <sakari.ailus@....fi>,
        <laurent.pinchart@...asonboard.com>,
        Eugen Hristev <eugen.hristev@...rochip.com>,
        Hans Verkuil <hverkuil@...all.nl>
Subject: [PATCH v4 01/11] media: atmel: atmel-isc: replace 'stop' variable with vb2 calls

The stop variable is redundant as the state of the streaming can be obtained
by calling vb2_start_streaming_called(&isc->vb2_vidq) or by calling
vb2_is_busy(&isc->vb2_vidq).
Thus, remove the stop variable completely.

Suggested-by: Hans Verkuil <hverkuil@...all.nl>
Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
---
Changes in v4:
- new patch

 drivers/media/platform/atmel/atmel-isc-base.c | 12 +++++-------
 drivers/media/platform/atmel/atmel-isc.h      |  2 --
 2 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/media/platform/atmel/atmel-isc-base.c b/drivers/media/platform/atmel/atmel-isc-base.c
index db15770d5b88..9c62d0ae7887 100644
--- a/drivers/media/platform/atmel/atmel-isc-base.c
+++ b/drivers/media/platform/atmel/atmel-isc-base.c
@@ -362,7 +362,6 @@ static int isc_start_streaming(struct vb2_queue *vq, unsigned int count)
 	spin_lock_irqsave(&isc->dma_queue_lock, flags);
 
 	isc->sequence = 0;
-	isc->stop = false;
 	reinit_completion(&isc->comp);
 
 	isc->cur_frm = list_first_entry(&isc->dma_queue,
@@ -403,8 +402,6 @@ static void isc_stop_streaming(struct vb2_queue *vq)
 
 	v4l2_ctrl_activate(isc->do_wb_ctrl, false);
 
-	isc->stop = true;
-
 	/* Wait until the end of the current frame */
 	if (isc->cur_frm && !wait_for_completion_timeout(&isc->comp, 5 * HZ))
 		v4l2_err(&isc->v4l2_dev,
@@ -1029,7 +1026,7 @@ static int isc_s_fmt_vid_cap(struct file *file, void *priv,
 {
 	struct isc_device *isc = video_drvdata(file);
 
-	if (vb2_is_streaming(&isc->vb2_vidq))
+	if (vb2_is_busy(&isc->vb2_vidq))
 		return -EBUSY;
 
 	return isc_set_fmt(isc, f);
@@ -1236,7 +1233,8 @@ irqreturn_t isc_interrupt(int irq, void *dev_id)
 			isc->cur_frm = NULL;
 		}
 
-		if (!list_empty(&isc->dma_queue) && !isc->stop) {
+		if (!list_empty(&isc->dma_queue) &&
+		    vb2_start_streaming_called(&isc->vb2_vidq)) {
 			isc->cur_frm = list_first_entry(&isc->dma_queue,
 						     struct isc_buffer, list);
 			list_del(&isc->cur_frm->list);
@@ -1244,7 +1242,7 @@ irqreturn_t isc_interrupt(int irq, void *dev_id)
 			isc_start_dma(isc);
 		}
 
-		if (isc->stop)
+		if (!vb2_start_streaming_called(&isc->vb2_vidq))
 			complete(&isc->comp);
 
 		ret = IRQ_HANDLED;
@@ -1398,7 +1396,7 @@ static void isc_awb_work(struct work_struct *w)
 	int ret;
 
 	/* streaming is not active anymore */
-	if (isc->stop)
+	if (!vb2_start_streaming_called(&isc->vb2_vidq))
 		return;
 
 	if (ctrls->hist_stat != HIST_ENABLED)
diff --git a/drivers/media/platform/atmel/atmel-isc.h b/drivers/media/platform/atmel/atmel-isc.h
index 07fa6dbf8460..5fbf52a9080b 100644
--- a/drivers/media/platform/atmel/atmel-isc.h
+++ b/drivers/media/platform/atmel/atmel-isc.h
@@ -201,7 +201,6 @@ struct isc_reg_offsets {
  * @dma_queue:		the queue for dma buffers
  * @cur_frm:		current isc frame/buffer
  * @sequence:		current frame number
- * @stop:		true if isc is not streaming, false if streaming
  * @comp:		completion reference that signals frame completion
  *
  * @fmt:		current v42l format
@@ -276,7 +275,6 @@ struct isc_device {
 	struct list_head	dma_queue;
 	struct isc_buffer	*cur_frm;
 	unsigned int		sequence;
-	bool			stop;
 	struct completion	comp;
 
 	struct v4l2_format	fmt;
-- 
2.25.1