linux-kernel - [PATCH v12 45/56] media: test-drivers: vivid: Increase max supported buffers for capture queues

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Message-Id: <20231017144756.34719-46-benjamin.gaignard@collabora.com>
Date:   Tue, 17 Oct 2023 16:47:45 +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 45/56] media: test-drivers: vivid: Increase max supported buffers for capture queues

Change the maximum number of buffers of some capture queues in order
to test max_num_buffers field.

Allow to allocate up to:
- 64 buffers for video capture queue.
- 1024 buffers for sdr capture queue.
- 32768 buffers for vbi capture queue.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
---
 drivers/media/test-drivers/vivid/vivid-core.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/media/test-drivers/vivid/vivid-core.c b/drivers/media/test-drivers/vivid/vivid-core.c
index 394c9f81ea72..353f035fcd19 100644
--- a/drivers/media/test-drivers/vivid/vivid-core.c
+++ b/drivers/media/test-drivers/vivid/vivid-core.c
@@ -876,6 +876,20 @@ static int vivid_create_queue(struct vivid_dev *dev,
 	q->type = buf_type;
 	q->io_modes = VB2_MMAP | VB2_DMABUF;
 	q->io_modes |= V4L2_TYPE_IS_OUTPUT(buf_type) ?  VB2_WRITE : VB2_READ;
+
+	/*
+	 * The maximum number of buffers is 32768 if PAGE_SHIFT == 12,
+	 * see also MAX_BUFFER_INDEX in videobuf2-core.c. It will be less if
+	 * PAGE_SHIFT > 12, but then max_num_buffers will be clamped by
+	 * videobuf2-core.c to MAX_BUFFER_INDEX.
+	 */
+	if (buf_type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		q->max_num_buffers = 64;
+	if (buf_type == V4L2_BUF_TYPE_SDR_CAPTURE)
+		q->max_num_buffers = 1024;
+	if (buf_type == V4L2_BUF_TYPE_VBI_CAPTURE)
+		q->max_num_buffers = 32768;
+
 	if (allocators[dev->inst] != 1)
 		q->io_modes |= VB2_USERPTR;
 	q->drv_priv = dev;
-- 
2.39.2