* [PATCH 27/55] media: sun6i-isp: Stop abusing of min_buffers_needed field [not found] <20231127165454.166373-1-benjamin.gaignard@collabora.com> @ 2023-11-27 16:54 ` Benjamin Gaignard 2023-11-29 13:40 ` Paul Kocialkowski 0 siblings, 1 reply; 3+ messages in thread From: Benjamin Gaignard @ 2023-11-27 16:54 UTC (permalink / raw) To: hverkuil, mchehab, tfiga, m.szyprowski, matt.ranostay Cc: linux-kernel, linux-media, linux-staging, kernel, Benjamin Gaignard, Paul Kocialkowski, Chen-Yu Tsai, Jernej Skrabec, Samuel Holland, linux-sunxi 'min_buffers_needed' is suppose to be used to indicate the number of buffers needed by DMA engine to start streaming. sun6i-isp driver doesn't use DMA engine and just want to specify the minimum number of buffers to allocate when calling VIDIOC_REQBUFS. That 'min_reqbufs_allocation' field purpose so use it. Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com> CC: Paul Kocialkowski <paul.kocialkowski@bootlin.com> CC: Chen-Yu Tsai <wens@csie.org> CC: Jernej Skrabec <jernej.skrabec@gmail.com> CC: Samuel Holland <samuel@sholland.org> CC: linux-sunxi@lists.linux.dev --- drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c | 2 +- drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_params.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c b/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c index 1595a9607775..f47f9946c19f 100644 --- a/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c +++ b/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c @@ -660,7 +660,7 @@ int sun6i_isp_capture_setup(struct sun6i_isp_device *isp_dev) queue->buf_struct_size = sizeof(struct sun6i_isp_buffer); queue->ops = &sun6i_isp_capture_queue_ops; queue->mem_ops = &vb2_dma_contig_memops; - queue->min_buffers_needed = 2; + queue->min_reqbufs_allocation = 2; queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; queue->lock = &capture->lock; queue->dev = isp_dev->dev; diff --git a/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_params.c b/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_params.c index e28be895b486..259f6bfcb620 100644 --- a/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_params.c +++ b/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_params.c @@ -489,7 +489,7 @@ int sun6i_isp_params_setup(struct sun6i_isp_device *isp_dev) queue->buf_struct_size = sizeof(struct sun6i_isp_buffer); queue->ops = &sun6i_isp_params_queue_ops; queue->mem_ops = &vb2_vmalloc_memops; - queue->min_buffers_needed = 1; + queue->min_reqbufs_allocation = 1; queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; queue->lock = ¶ms->lock; queue->dev = isp_dev->dev; -- 2.39.2 ^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH 27/55] media: sun6i-isp: Stop abusing of min_buffers_needed field 2023-11-27 16:54 ` [PATCH 27/55] media: sun6i-isp: Stop abusing of min_buffers_needed field Benjamin Gaignard @ 2023-11-29 13:40 ` Paul Kocialkowski 2023-11-29 14:03 ` Benjamin Gaignard 0 siblings, 1 reply; 3+ messages in thread From: Paul Kocialkowski @ 2023-11-29 13:40 UTC (permalink / raw) To: Benjamin Gaignard Cc: hverkuil, mchehab, tfiga, m.szyprowski, matt.ranostay, linux-kernel, linux-media, linux-staging, kernel, Chen-Yu Tsai, Jernej Skrabec, Samuel Holland, linux-sunxi [-- Attachment #1: Type: text/plain, Size: 2841 bytes --] Hi Benjamin, On Mon 27 Nov 23, 17:54, Benjamin Gaignard wrote: > 'min_buffers_needed' is suppose to be used to indicate the number > of buffers needed by DMA engine to start streaming. > sun6i-isp driver doesn't use DMA engine and just want to specify > the minimum number of buffers to allocate when calling VIDIOC_REQBUFS. > That 'min_reqbufs_allocation' field purpose so use it. The hardware actually has its own DMA engine. It can work with just one buffer though (which will never be returned to userspace). But I think we should still require at least two buffers allocated, otherwise the driver will be of no use at all. So I don't think the commit message here is correct. Cheers, Paul > Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com> > CC: Paul Kocialkowski <paul.kocialkowski@bootlin.com> > CC: Chen-Yu Tsai <wens@csie.org> > CC: Jernej Skrabec <jernej.skrabec@gmail.com> > CC: Samuel Holland <samuel@sholland.org> > CC: linux-sunxi@lists.linux.dev > --- > drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c | 2 +- > drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_params.c | 2 +- > 2 files changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c b/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c > index 1595a9607775..f47f9946c19f 100644 > --- a/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c > +++ b/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c > @@ -660,7 +660,7 @@ int sun6i_isp_capture_setup(struct sun6i_isp_device *isp_dev) > queue->buf_struct_size = sizeof(struct sun6i_isp_buffer); > queue->ops = &sun6i_isp_capture_queue_ops; > queue->mem_ops = &vb2_dma_contig_memops; > - queue->min_buffers_needed = 2; > + queue->min_reqbufs_allocation = 2; > queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; > queue->lock = &capture->lock; > queue->dev = isp_dev->dev; > diff --git a/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_params.c b/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_params.c > index e28be895b486..259f6bfcb620 100644 > --- a/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_params.c > +++ b/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_params.c > @@ -489,7 +489,7 @@ int sun6i_isp_params_setup(struct sun6i_isp_device *isp_dev) > queue->buf_struct_size = sizeof(struct sun6i_isp_buffer); > queue->ops = &sun6i_isp_params_queue_ops; > queue->mem_ops = &vb2_vmalloc_memops; > - queue->min_buffers_needed = 1; > + queue->min_reqbufs_allocation = 1; > queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; > queue->lock = ¶ms->lock; > queue->dev = isp_dev->dev; > -- > 2.39.2 > -- Paul Kocialkowski, Bootlin Embedded Linux and kernel engineering https://bootlin.com [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 488 bytes --] ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH 27/55] media: sun6i-isp: Stop abusing of min_buffers_needed field 2023-11-29 13:40 ` Paul Kocialkowski @ 2023-11-29 14:03 ` Benjamin Gaignard 0 siblings, 0 replies; 3+ messages in thread From: Benjamin Gaignard @ 2023-11-29 14:03 UTC (permalink / raw) To: Paul Kocialkowski Cc: hverkuil, mchehab, tfiga, m.szyprowski, matt.ranostay, linux-kernel, linux-media, linux-staging, kernel, Chen-Yu Tsai, Jernej Skrabec, Samuel Holland, linux-sunxi Le 29/11/2023 à 14:40, Paul Kocialkowski a écrit : > Hi Benjamin, > > On Mon 27 Nov 23, 17:54, Benjamin Gaignard wrote: >> 'min_buffers_needed' is suppose to be used to indicate the number >> of buffers needed by DMA engine to start streaming. >> sun6i-isp driver doesn't use DMA engine and just want to specify >> the minimum number of buffers to allocate when calling VIDIOC_REQBUFS. >> That 'min_reqbufs_allocation' field purpose so use it. > The hardware actually has its own DMA engine. It can work with just one buffer > though (which will never be returned to userspace). But I think we should still > require at least two buffers allocated, otherwise the driver will be of no use > at all. > > So I don't think the commit message here is correct. That is exactly the info I hope to get for this first series since I don't know each hardware block details. I will remove this commit and make the driver use min_queued_buffers field instead so that will fit with it needs. Thanks, Benjamin > > Cheers, > > Paul > >> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com> >> CC: Paul Kocialkowski <paul.kocialkowski@bootlin.com> >> CC: Chen-Yu Tsai <wens@csie.org> >> CC: Jernej Skrabec <jernej.skrabec@gmail.com> >> CC: Samuel Holland <samuel@sholland.org> >> CC: linux-sunxi@lists.linux.dev >> --- >> drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c | 2 +- >> drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_params.c | 2 +- >> 2 files changed, 2 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c b/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c >> index 1595a9607775..f47f9946c19f 100644 >> --- a/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c >> +++ b/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c >> @@ -660,7 +660,7 @@ int sun6i_isp_capture_setup(struct sun6i_isp_device *isp_dev) >> queue->buf_struct_size = sizeof(struct sun6i_isp_buffer); >> queue->ops = &sun6i_isp_capture_queue_ops; >> queue->mem_ops = &vb2_dma_contig_memops; >> - queue->min_buffers_needed = 2; >> + queue->min_reqbufs_allocation = 2; >> queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; >> queue->lock = &capture->lock; >> queue->dev = isp_dev->dev; >> diff --git a/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_params.c b/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_params.c >> index e28be895b486..259f6bfcb620 100644 >> --- a/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_params.c >> +++ b/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_params.c >> @@ -489,7 +489,7 @@ int sun6i_isp_params_setup(struct sun6i_isp_device *isp_dev) >> queue->buf_struct_size = sizeof(struct sun6i_isp_buffer); >> queue->ops = &sun6i_isp_params_queue_ops; >> queue->mem_ops = &vb2_vmalloc_memops; >> - queue->min_buffers_needed = 1; >> + queue->min_reqbufs_allocation = 1; >> queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; >> queue->lock = ¶ms->lock; >> queue->dev = isp_dev->dev; >> -- >> 2.39.2 >> ^ permalink raw reply [flat|nested] 3+ messages in thread
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[not found] <20231127165454.166373-1-benjamin.gaignard@collabora.com>
2023-11-27 16:54 ` [PATCH 27/55] media: sun6i-isp: Stop abusing of min_buffers_needed field Benjamin Gaignard
2023-11-29 13:40 ` Paul Kocialkowski
2023-11-29 14:03 ` Benjamin Gaignard
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