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authorVille Syrjälä <ville.syrjala@linux.intel.com>2015-10-08 11:43:33 +0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2015-10-20 13:01:29 +0300
commit9afd808cf3c45810492f2e05b7c422c99edc88cc (patch)
treebd3b215864bef85ee765743983e2e672d51ebe04 /drivers/gpu/drm/drm_edid.c
parentfa3a7340eaa174a36c12c31747dc6eccd08530b5 (diff)
downloadlinux-9afd808cf3c45810492f2e05b7c422c99edc88cc.tar.xz
drm/edid: Round to closest when computing the CEA/HDMI alternate clock
Rounding to the closest kHz seems like the better option that round down or up when computing the alternate clock for CEA/HDMI modes. It'll give us a slightly more accurate clock in some cases. Not sure why I went for the down+up approach originally. Perhaps I was thinking we can go back and forth betwen the two frequencies without introducing errors, but round to closest still maintains that property. Cc: Adam Jackson <ajax@redhat.com> Cc: Clint Taylor <clinton.a.taylor@intel.com> Cc: Libin Yang <libin.yang@intel.com> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Adam Jackson <ajax@redhat.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/drm_edid.c')
-rw-r--r--drivers/gpu/drm/drm_edid.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 977915cf530a..d5d2c03fd136 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2538,9 +2538,9 @@ cea_mode_alternate_clock(const struct drm_display_mode *cea_mode)
* and the 60Hz variant otherwise.
*/
if (cea_mode->vdisplay == 240 || cea_mode->vdisplay == 480)
- clock = clock * 1001 / 1000;
+ clock = DIV_ROUND_CLOSEST(clock * 1001, 1000);
else
- clock = DIV_ROUND_UP(clock * 1000, 1001);
+ clock = DIV_ROUND_CLOSEST(clock * 1000, 1001);
return clock;
}