linux-kernel - [PATCH v8 34/53] media: renesas: Set min_buffers

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Date:   Wed, 27 Sep 2023 17:35:39 +0200
From:   Benjamin Gaignard <benjamin.gaignard@...labora.com>
To:     mchehab@...nel.org, tfiga@...omium.org, m.szyprowski@...sung.com,
        ming.qian@....com, ezequiel@...guardiasur.com.ar,
        p.zabel@...gutronix.de, gregkh@...uxfoundation.org,
        hverkuil-cisco@...all.nl, nicolas.dufresne@...labora.com
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        kernel@...labora.com,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>
Subject: [PATCH v8 34/53] media: renesas: Set min_buffers_needed to 16

vb2 queue_setup checks for a minimum number of buffers so set
min_buffers_needed to 16 and remove the useless check in
rcar_drif_queue_setup().

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
---
 drivers/media/platform/renesas/rcar_drif.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/media/platform/renesas/rcar_drif.c b/drivers/media/platform/renesas/rcar_drif.c
index 163a4ba61c17..8a9a70565d3f 100644
--- a/drivers/media/platform/renesas/rcar_drif.c
+++ b/drivers/media/platform/renesas/rcar_drif.c
@@ -425,13 +425,9 @@ static int rcar_drif_queue_setup(struct vb2_queue *vq,
 {
 	struct rcar_drif_sdr *sdr = vb2_get_drv_priv(vq);
 
-	/* Need at least 16 buffers */
-	if (vq->num_buffers + *num_buffers < 16)
-		*num_buffers = 16 - vq->num_buffers;
-
 	*num_planes = 1;
 	sizes[0] = PAGE_ALIGN(sdr->fmt->buffersize);
-	rdrif_dbg(sdr, "num_bufs %d sizes[0] %d\n", *num_buffers, sizes[0]);
+	rdrif_dbg(sdr, "num_bufs %u sizes[0] %d\n", vb2_get_num_buffers(vq), sizes[0]);
 
 	return 0;
 }
@@ -1311,6 +1307,8 @@ static int rcar_drif_sdr_probe(struct rcar_drif_sdr *sdr)
 	/* Init videobuf2 queue structure */
 	sdr->vb_queue.type = V4L2_BUF_TYPE_SDR_CAPTURE;
 	sdr->vb_queue.io_modes = VB2_READ | VB2_MMAP | VB2_DMABUF;
+	/* Need at least 16 buffers */
+	sdr->vb_queue.min_buffers_needed = 16;
 	sdr->vb_queue.drv_priv = sdr;
 	sdr->vb_queue.buf_struct_size = sizeof(struct rcar_drif_frame_buf);
 	sdr->vb_queue.ops = &rcar_drif_vb2_ops;
-- 
2.39.2