media: Revert "media: camss: Make use of V4L2_CAP_IO_MC"

This reverts commit c90f1178.

The assumption of "Each entry in formats[] table has unique mbus_code"
is valid for the RDI entities, but not for the PIX ones.

Reverting this patch and creating a new one which handles the PIX entities
correctly results in smaller and more straightforward patch than doing the
changes on top of the current version.
Signed-off-by: Andrey Konovalov <andrey.konovalov@linaro.org>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/qcom/camss/camss-video.c

@@ -535,16 +535,17 @@ static int video_querycap(struct file *file, void *fh,
 	return 0;
 }
 
-/*
- *  Returns the index in the video->formats[] array of the element which
- *  has the "ndx"th unique value of pixelformat field.
- *  If not found (no more unique pixelformat's) returns -EINVAL.
- */
-static int video_get_unique_pixelformat_by_index(struct camss_video *video,
-						 int ndx)
+static int video_enum_fmt(struct file *file, void *fh, struct v4l2_fmtdesc *f)
 {
+	struct camss_video *video = video_drvdata(file);
 	int i, j, k;
 
+	if (f->type != video->type)
+		return -EINVAL;
+
+	if (f->index >= video->nformats)
+		return -EINVAL;
+
 	/* find index "i" of "k"th unique pixelformat in formats array */
 	k = -1;
 	for (i = 0; i < video->nformats; i++) {
@@ -557,53 +558,11 @@ static int video_get_unique_pixelformat_by_index(struct camss_video *video,
 		if (j == i)
 			k++;
 
-		if (k == ndx)
-			return i;
-	}
-
-	return -EINVAL;
-}
-
-/*
- *  Returns the index in the video->formats[] array of the element which
- *  has code equal to mcode.
- *  If not found returns -EINVAL.
- */
-static int video_get_pixelformat_by_mbus_code(struct camss_video *video,
-					      u32 mcode)
-{
-	int i;
-
-	for (i = 0; i < video->nformats; i++) {
-		if (video->formats[i].code == mcode)
-			return i;
-	}
-
-	return -EINVAL;
-}
-
-static int video_enum_fmt(struct file *file, void *fh, struct v4l2_fmtdesc *f)
-{
-	struct camss_video *video = video_drvdata(file);
-	int i;
-
-	if (f->type != video->type)
-		return -EINVAL;
-
-	if (f->index >= video->nformats)
-		return -EINVAL;
-
-	if (f->mbus_code) {
-		/* Each entry in formats[] table has unique mbus_code */
-		if (f->index > 0)
-			return -EINVAL;
-
-		i = video_get_pixelformat_by_mbus_code(video, f->mbus_code);
-	} else {
-		i = video_get_unique_pixelformat_by_index(video, f->index);
+		if (k == f->index)
+			break;
 	}
 
-	if (i < 0)
+	if (k < f->index)
 		return -EINVAL;
 
 	f->pixelformat = video->formats[i].pixelformat;
@@ -990,8 +949,8 @@ int msm_video_register(struct camss_video *video, struct v4l2_device *v4l2_dev,
 	}
 
 	vdev->fops = &msm_vid_fops;
-	vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE_MPLANE | V4L2_CAP_STREAMING
-			  | V4L2_CAP_READWRITE | V4L2_CAP_IO_MC;
+	vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE_MPLANE | V4L2_CAP_STREAMING |
+							V4L2_CAP_READWRITE;
 	vdev->ioctl_ops = &msm_vid_ioctl_ops;
 	vdev->release = msm_video_release;
 	vdev->v4l2_dev = v4l2_dev;