[media] coda: v4l2-compliance fix: implement try_decoder_cmd

Implement try_decoder_cmd to let userspace determine available commands
and flags.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 20 insertions, 8 deletions

diff --git a/drivers/media/platform/coda.c b/drivers/media/platform/coda.c
index 4820bd57ed40..b541c069ffe9 100644
--- a/drivers/media/platform/coda.c
+++ b/drivers/media/platform/coda.c
@@ -835,23 +835,34 @@ static int coda_streamoff(struct file *file, void *priv,
         return ret;
 }
 
-static int coda_decoder_cmd(struct file *file, void *fh,
-                                   struct v4l2_decoder_cmd *dc)
+static int coda_try_decoder_cmd(struct file *file, void *fh,
+                                struct v4l2_decoder_cmd *dc)
 {
-        struct coda_ctx *ctx = fh_to_ctx(fh);
-
         if (dc->cmd != V4L2_DEC_CMD_STOP)
                 return -EINVAL;
 
-        if ((dc->flags & V4L2_DEC_CMD_STOP_TO_BLACK) ||
-            (dc->flags & V4L2_DEC_CMD_STOP_IMMEDIATELY))
+        if (dc->flags & V4L2_DEC_CMD_STOP_TO_BLACK)
                 return -EINVAL;
 
-        if (dc->stop.pts != 0)
+        if (!(dc->flags & V4L2_DEC_CMD_STOP_IMMEDIATELY) && (dc->stop.pts != 0))
                 return -EINVAL;
 
+        return 0;
+}
+
+static int coda_decoder_cmd(struct file *file, void *fh,
+                            struct v4l2_decoder_cmd *dc)
+{
+        struct coda_ctx *ctx = fh_to_ctx(fh);
+        int ret;
+
+        ret = coda_try_decoder_cmd(file, fh, dc);
+        if (ret < 0)
+                return ret;
+
+        /* Ignore decoder stop command silently in encoder context */
         if (ctx->inst_type != CODA_INST_DECODER)
-                return -EINVAL;
+                return 0;
 
         /* Set the strem-end flag on this context */
         ctx->bit_stream_param |= CODA_BIT_STREAM_END_FLAG;
@@ -894,6 +905,7 @@ static const struct v4l2_ioctl_ops coda_ioctl_ops = {
         .vidioc_streamon        = coda_streamon,
         .vidioc_streamoff       = coda_streamoff,
 
+        .vidioc_try_decoder_cmd = coda_try_decoder_cmd,
         .vidioc_decoder_cmd     = coda_decoder_cmd,
 
         .vidioc_subscribe_event = coda_subscribe_event,