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Subject: media: hantro: Fix s_fmt for dynamic resolution changes
Author:  Ezequiel Garcia <ezequ...@collabora.com>
Date:    Mon Oct 7 19:45:02 2019 +0200

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 <ezequ...@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezil...@collabora.com>
Cc: <sta...@vger.kernel.org>      # for v5.4 and up
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mche...@kernel.org>

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

---

diff --git a/drivers/staging/media/hantro/hantro_v4l2.c 
b/drivers/staging/media/hantro/hantro_v4l2.c
index 3dae52abb96c..fcf95c1d39ca 100644
--- a/drivers/staging/media/hantro/hantro_v4l2.c
+++ b/drivers/staging/media/hantro/hantro_v4l2.c
@@ -367,20 +367,27 @@ vidioc_s_fmt_out_mplane(struct file *file, void *priv, 
struct v4l2_format *f)
 {
        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.
@@ -389,12 +396,15 @@ vidioc_s_fmt_out_mplane(struct file *file, void *priv, 
struct v4l2_format *f)
                                          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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