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media: venus: fix reported size of 0-length buffers 

The last buffer is often signaled by an empty buffer with the
V4L2_BUF_FLAG_LAST flag set. Such buffers were returned with the
bytesused field set to the full size of the OPB, which leads
user-space to believe that the buffer actually contains useful data. Fix
this by passing the number of bytes reported used by the firmware.

Signed-off-by: Alexandre Courbot <acourbot@chromium.org>
Acked-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Alexandre Courbot 2018-11-13 04:30:48 -05:00 committed by Mauro Carvalho Chehab
parent 61df5aa325
commit 87e25f4b2c
1 changed files with 1 additions and 3 deletions
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4
drivers/media/platform/qcom/venus/vdec.c
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@ -885,10 +885,8 @@ static void vdec_buf_done(struct venus_inst *inst, unsigned int buf_type,
vbuf->field = V4L2_FIELD_NONE;
if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
unsigned int opb_sz = venus_helper_get_opb_size(inst);
vb = &vbuf->vb2_buf;
vb2_set_plane_payload(vb, 0, bytesused ? : opb_sz);
vb2_set_plane_payload(vb, 0, bytesused);
vb->planes[0].data_offset = data_offset;
vb->timestamp = timestamp_us * NSEC_PER_USEC;
vbuf->sequence = inst->sequence_cap++;