drm: fixes crct set_mode when crtc mode_fixup is null.

This patch set nukes all the dummy crtc mode_fixup implementations.
(made on top of Daniel topic/drm-misc branch)

Signed-off-by: Carlos Palminha <palminha@synopsys.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/9d41105dee6632b4bb50e9555f2196ac249b9fce.1455630967.git.palminha@synopsys.com

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index e70d064693ee..7539eea4ccbc 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -343,9 +343,12 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
                 }
         }
 
-        if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
-                DRM_DEBUG_KMS("CRTC fixup failed\n");
-                goto done;
+        if (crtc_funcs->mode_fixup) {
+                if (!(ret = crtc_funcs->mode_fixup(crtc, mode,
+                                                adjusted_mode))) {
+                        DRM_DEBUG_KMS("CRTC fixup failed\n");
+                        goto done;
+                }
         }
         DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);