[media] V4L: sh_mobile_ceu_camera: don't try to improve client scaling, if perfect

If the client has managed to configure the precise output format,
we don't have to try to further improve it.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/sh_mobile_ceu_camera.c b/drivers/media/video/sh_mobile_ceu_camera.c
index f753df1..b44f318 100644 (file)
--- a/drivers/media/video/sh_mobile_ceu_camera.c
+++ b/drivers/media/video/sh_mobile_ceu_camera.c
@@ -1279,6 +1279,7 @@ static int client_s_fmt(struct soc_camera_device *icd,
        unsigned int width = mf->width, height = mf->height, tmp_w, tmp_h;
        unsigned int max_width, max_height;
        struct v4l2_cropcap cap;
+       bool ceu_1to1;
        int ret;
 
        ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
@@ -1288,7 +1289,14 @@ static int client_s_fmt(struct soc_camera_device *icd,
 
        dev_geo(dev, "camera scaled to %ux%u\n", mf->width, mf->height);
 
-       if ((width == mf->width && height == mf->height) || !ceu_can_scale)
+       if (width == mf->width && height == mf->height) {
+               /* Perfect! The client has done it all. */
+               ceu_1to1 = true;
+               goto update_cache;
+       }
+
+       ceu_1to1 = false;
+       if (!ceu_can_scale)
                goto update_cache;
 
        cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
@@ -1328,7 +1336,10 @@ update_cache:
        if (ret < 0)
                return ret;
 
-       update_subrect(cam);
+       if (ceu_1to1)
+               cam->subrect = cam->rect;
+       else
+               update_subrect(cam);
 
        return 0;
 }
@@ -1579,8 +1590,8 @@ static void calculate_client_output(struct soc_camera_device *icd,
        dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v);
 
        /*
-        * 4. Calculate client output window by applying combined scales to real
-        *    input window.
+        * 4. Calculate desired client output window by applying combined scales
+        *    to client (real) input window.
         */
        mf->width       = scale_down(cam->rect.width, scale_h);
        mf->height      = scale_down(cam->rect.height, scale_v);
@@ -1627,7 +1638,7 @@ static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
                return -EINVAL;
        }
 
-       /* 1.-4. Calculate client output geometry */
+       /* 1.-4. Calculate desired client output geometry */
        calculate_client_output(icd, pix, &mf);
        mf.field        = pix->field;
        mf.colorspace   = pix->colorspace;