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>

diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c
index 189ec97..282de21 100644 (file)
--- a/drivers/media/platform/qcom/venus/vdec.c
+++ b/drivers/media/platform/qcom/venus/vdec.c
@@ -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++;