media: mtk-vcodec: venc: fix invalid time per frame in S_PARM

v4l2-compliance expects the driver to adjust the time per frame if it is
invalid (numerator or denominator set to 0). Adjust it to the default
value in these cases.
Signed-off-by: Alexandre Courbot <acourbot@chromium.org>
Acked-by: Tiffany Lin <tiffany.lin@mediatek.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.c

@@ -200,14 +200,18 @@ static int vidioc_venc_s_parm(struct file *file, void *priv,
 			      struct v4l2_streamparm *a)
 {
 	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+	struct v4l2_fract *timeperframe = &a->parm.output.timeperframe;
 
 	if (a->type != V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
 		return -EINVAL;
 
-	ctx->enc_params.framerate_num =
-			a->parm.output.timeperframe.denominator;
-	ctx->enc_params.framerate_denom =
-			a->parm.output.timeperframe.numerator;
+	if (timeperframe->numerator == 0 || timeperframe->denominator == 0) {
+		timeperframe->numerator = MTK_DEFAULT_FRAMERATE_NUM;
+		timeperframe->denominator = MTK_DEFAULT_FRAMERATE_DENOM;
+	}
+
+	ctx->enc_params.framerate_num = timeperframe->denominator;
+	ctx->enc_params.framerate_denom = timeperframe->numerator;
 	ctx->param_change |= MTK_ENCODE_PARAM_FRAMERATE;
 
 	a->parm.output.capability = V4L2_CAP_TIMEPERFRAME;