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Subject[PATCH 5.3 085/180] media: hantro: Fix s_fmt for dynamic resolution changes
Date
From: Ezequiel Garcia <ezequiel@collabora.com>

commit ae02d49493b5d32bb3e035fdeb1655346f5e1ea5 upstream.

Commit 953aaa1492c53 ("media: rockchip/vpu: Prepare things to support decoders")
changed the conditions under S_FMT was allowed for OUTPUT
CAPTURE buffers.

However, and according to the mem-to-mem stateless decoder specification,
in order to support dynamic resolution changes, S_FMT should be allowed
even if OUTPUT buffers have been allocated.

Relax decoder S_FMT restrictions on OUTPUT buffers, allowing a
resolution modification, provided the pixel format stays the same.

Tested on RK3288 platforms using ChromiumOS Video Decode/Encode
Accelerator Unittests.

[hverkuil: fix typo: In other -> In order]

Fixes: 953aaa1492c53 ("media: rockchip/vpu: Prepare things to support decoders")
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Cc: <stable@vger.kernel.org> # for v5.4 and up
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/staging/media/hantro/hantro_v4l2.c | 28 +++++++++++++++++++---------
1 file changed, 19 insertions(+), 9 deletions(-)

--- a/drivers/staging/media/hantro/hantro_v4l2.c
+++ b/drivers/staging/media/hantro/hantro_v4l2.c
@@ -356,20 +356,27 @@ vidioc_s_fmt_out_mplane(struct file *fil
{
struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
struct hantro_ctx *ctx = fh_to_ctx(priv);
+ struct vb2_queue *vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
const struct hantro_fmt *formats;
unsigned int num_fmts;
- struct vb2_queue *vq;
int ret;

- /* Change not allowed if queue is busy. */
- vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
- if (vb2_is_busy(vq))
- return -EBUSY;
+ ret = vidioc_try_fmt_out_mplane(file, priv, f);
+ if (ret)
+ return ret;

if (!hantro_is_encoder_ctx(ctx)) {
struct vb2_queue *peer_vq;

/*
+ * In order to support dynamic resolution change,
+ * the decoder admits a resolution change, as long
+ * as the pixelformat remains. Can't be done if streaming.
+ */
+ if (vb2_is_streaming(vq) || (vb2_is_busy(vq) &&
+ pix_mp->pixelformat != ctx->src_fmt.pixelformat))
+ return -EBUSY;
+ /*
* Since format change on the OUTPUT queue will reset
* the CAPTURE queue, we can't allow doing so
* when the CAPTURE queue has buffers allocated.
@@ -378,12 +385,15 @@ vidioc_s_fmt_out_mplane(struct file *fil
V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
if (vb2_is_busy(peer_vq))
return -EBUSY;
+ } else {
+ /*
+ * The encoder doesn't admit a format change if
+ * there are OUTPUT buffers allocated.
+ */
+ if (vb2_is_busy(vq))
+ return -EBUSY;
}

- ret = vidioc_try_fmt_out_mplane(file, priv, f);
- if (ret)
- return ret;
-
formats = hantro_get_formats(ctx, &num_fmts);
ctx->vpu_src_fmt = hantro_find_format(formats, num_fmts,
pix_mp->pixelformat);

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