Current implementation shows error as "failed to set gamma: Function
no implemented" if platform specific drm has no gamma property implemented

Signed-off-by: Rohit Visavalia <rohit.visava...@xilinx.com>
---
 tests/modetest/modetest.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/tests/modetest/modetest.c b/tests/modetest/modetest.c
index b907ab3..23ee73d 100644
--- a/tests/modetest/modetest.c
+++ b/tests/modetest/modetest.c
@@ -1328,14 +1328,24 @@ static int set_plane(struct device *dev, struct 
plane_arg *p)
 static void atomic_set_planes(struct device *dev, struct plane_arg *p,
                              unsigned int count, bool update)
 {
-       unsigned int i, pattern = primary_fill;
+       unsigned int i, j, pattern = primary_fill;
+       struct crtc *crtc = NULL;

        /* set up planes */
        for (i = 0; i < count; i++) {
-               if (i > 0)
+               if (i > 0) {
                        pattern = secondary_fill;
-               else
-                       set_gamma(dev, p[i].crtc_id, p[i].fourcc);
+               } else {
+                       for (j = 0; j < dev->resources->res->count_crtcs; j++) {
+                               if (p[i].crtc_id ==
+                                   dev->resources->res->crtcs[j]) {
+                                       crtc = &dev->resources->crtcs[j];
+                                       break;
+                               }
+                       }
+                       if (crtc->crtc->gamma_size)
+                               set_gamma(dev, p[i].crtc_id, p[i].fourcc);
+               }

                if (atomic_set_plane(dev, &p[i], pattern, update))
                        return;
@@ -1522,7 +1532,8 @@ static void set_mode(struct device *dev, struct pipe_arg 
*pipes, unsigned int co
                        return;
                }

-               set_gamma(dev, pipe->crtc->crtc->crtc_id, pipe->fourcc);
+               if (pipe->crtc->crtc->gamma_size)
+                       set_gamma(dev, pipe->crtc->crtc->crtc_id, pipe->fourcc);
        }
 }

--
2.7.4

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