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@xxxxxxxxx>
>> Signed-off-by: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
>
> I trust yours and Hans' judgment here.
> The patch looks sane
> Reviewed-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
>
> 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
>>
