From: Dave Airlie <airlied@redhat.com>
Date: Thu, 6 Dec 2007 01:46:54 +0000 (+1000)
Subject: check previous mode first
X-Git-Tag: libdrm-2.4.3~16^2~330^2~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8020724615eb6f334d5f90b1e83e6a46d4a126ac;p=platform%2Fupstream%2Flibdrm.git

check previous mode first
---

diff --git a/linux-core/intel_fb.c b/linux-core/intel_fb.c
index 0a3a00b..c81e440 100644
--- a/linux-core/intel_fb.c
+++ b/linux-core/intel_fb.c
@@ -320,9 +320,11 @@ static int intelfb_set_par(struct fb_info *info)
 		drm_mode_attachmode_crtc(dev, par->crtc, par->fb_mode);
 	}
 
-        if (!drm_crtc_set_mode(par->crtc, drm_mode, 0, 0))
+	if (par->crtc->enabled) {
+	  if (!drm_mode_equal(&par->crtc->mode, drm_mode))
+	      if (!drm_crtc_set_mode(par->crtc, drm_mode, 0, 0))
                 return -EINVAL;
-
+	}
 	return 0;
 }