linux-kernel - [PATCH v12 22/56] media: pci: tw686x: Set min_buffers

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Message-Id: <20231017144756.34719-23-benjamin.gaignard@collabora.com>
Date:   Tue, 17 Oct 2023 16:47:22 +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 v12 22/56] media: pci: tw686x: Set min_buffers_needed to 3

vb2 queue_setup checks for a minimum number of buffers so set
min_buffers_needed to 3 and remove the useless check in
tw686x_queue_setup().

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
CC: Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
---
 drivers/media/pci/tw686x/tw686x-video.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/media/pci/tw686x/tw686x-video.c b/drivers/media/pci/tw686x/tw686x-video.c
index 3ebf7a2c95f0..74cd864365aa 100644
--- a/drivers/media/pci/tw686x/tw686x-video.c
+++ b/drivers/media/pci/tw686x/tw686x-video.c
@@ -426,13 +426,6 @@ static int tw686x_queue_setup(struct vb2_queue *vq,
 	unsigned int szimage =
 		(vc->width * vc->height * vc->format->depth) >> 3;
 
-	/*
-	 * Let's request at least three buffers: two for the
-	 * DMA engine and one for userspace.
-	 */
-	if (vq->num_buffers + *nbuffers < 3)
-		*nbuffers = 3 - vq->num_buffers;
-
 	if (*nplanes) {
 		if (*nplanes != 1 || sizes[0] < szimage)
 			return -EINVAL;
@@ -1221,7 +1214,11 @@ int tw686x_video_init(struct tw686x_dev *dev)
 		vc->vidq.ops = &tw686x_video_qops;
 		vc->vidq.mem_ops = dev->dma_ops->mem_ops;
 		vc->vidq.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
-		vc->vidq.min_buffers_needed = 2;
+		/*
+		 * Let's request at least three buffers: two for the
+		 * DMA engine and one for userspace.
+		 */
+		vc->vidq.min_buffers_needed = 3;
 		vc->vidq.lock = &vc->vb_mutex;
 		vc->vidq.gfp_flags = dev->dma_mode != TW686X_DMA_MODE_MEMCPY ?
 				     GFP_DMA32 : 0;
-- 
2.39.2