diff mbox series

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

Message ID 20220121131416.603972-2-eugen.hristev@microchip.com (mailing list archive)
State New, archived
Headers show
Series media: atmel: atmel-isc: implement media controller | expand

Commit Message

Eugen Hristev Jan. 21, 2022, 1:14 p.m. UTC 
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@xs4all.nl>
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.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(-)

Comments

Jacopo Mondi Feb. 7, 2022, 10:46 a.m. UTC | #1 
Hi Eugen,

On Fri, Jan 21, 2022 at 03:14:06PM +0200, Eugen Hristev wrote:
> 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@xs4all.nl>
> Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>

I trust yours and Hans' judgment here.
The patch looks sane
Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>

Thanks
> ---
> 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
>
Eugen Hristev Feb. 8, 2022, 12:50 p.m. UTC | #2 
On 2/7/22 12:46 PM, Jacopo Mondi wrote:
> Hi Eugen,
> 
> On Fri, Jan 21, 2022 at 03:14:06PM +0200, Eugen Hristev wrote:
>> 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@xs4all.nl>
>> Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
> 
> I trust yours and Hans' judgment here.
> The patch looks sane
> Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> 
> Thanks
>> ---
>> 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))

Hello Hans, Jacopo,

This patch has a problem here. In the IRQ context, I cannot tell whether 
the stop streaming has been called or not.
When stop streaming is called, vb2_start_streaming_called still returns 
true.
So in the IRQ context I cannot know if I have to program the next buffer 
and start the next capture (next DMA), or I have to stop, and call 
complete on the isc completion , such that stop streaming will release 
all the other buffers.
To know this, it was previously done with the 'stop' variable which was 
set when stop_streaming was called.
Any idea how to handle this with vb2_ calls ?

Or I would have to rework this patch and keep the 'stop' internal variable ?

Thanks,
Eugen


>>                        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
>>
diff mbox series

Patch

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;