Re: [PATCH 07/55] media: imx8-isi: Stop abusing of min_buffers_needed field

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Le 27/11/2023 à 18:07, Laurent Pinchart a écrit :
Hi Benjamin,

Thank you for the patch.

On Mon, Nov 27, 2023 at 05:54:06PM +0100, Benjamin Gaignard wrote:
'min_buffers_needed' is suppose to be used to indicate the number
of buffers needed by DMA engine to start streaming.
imx8-isi driver doesn't use DMA engine and just want to specify
What do you mean, "doesn't use DMA engine" ? The ISI surely has DMA
engines :-)

I have done assumption on drivers given if they use or dma_* functions.
I have considers that all PCI drivers are using DMA engine and
I don't know the design for each drivers so I hope to get this information
from maintainers and fix that in v2.
If imx8-isi driver needs a minimum number of buffers before start streaming
I will do a v2 and use min_dma_buffers_needed instead.

Regards,
Benjamin


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@xxxxxxxxxxxxx>
CC: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
CC: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
CC: Shawn Guo <shawnguo@xxxxxxxxxx>
CC: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
CC: Pengutronix Kernel Team <kernel@xxxxxxxxxxxxxx>
CC: Fabio Estevam <festevam@xxxxxxxxx>
CC: NXP Linux Team <linux-imx@xxxxxxx>
---
  drivers/media/platform/nxp/imx8-isi/imx8-isi-video.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-video.c b/drivers/media/platform/nxp/imx8-isi/imx8-isi-video.c
index 49bca2b01cc6..81673ff9084b 100644
--- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-video.c
+++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-video.c
@@ -1453,7 +1453,7 @@ int mxc_isi_video_register(struct mxc_isi_pipe *pipe,
  	q->mem_ops = &vb2_dma_contig_memops;
  	q->buf_struct_size = sizeof(struct mxc_isi_buffer);
  	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
-	q->min_buffers_needed = 2;
+	q->min_reqbufs_allocation = 2;
  	q->lock = &video->lock;
  	q->dev = pipe->isi->dev;




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