drm/i915: only set TV mode when any property changed

upstream commit: ebcc8f2eade76946dbb5d5c545b91f8157051aa8

If there's no real property change, don't need to set TV mode again.

Signed-off-by: Zhenyu Wang <zhenyu.z.wang@intel.com>
[anholt: checkpatch.pl fix]
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>

diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c
index 56485d67369b8dcf913b28b17afa9bb3bd3b3de8..d5bce10b613ef2115a9f4685bfb2e51fd561d04c 100644 (file)
--- a/drivers/gpu/drm/i915/intel_tv.c
+++ b/drivers/gpu/drm/i915/intel_tv.c
@@ -1559,32 +1559,45 @@ intel_tv_set_property(struct drm_connector *connector, struct drm_property *prop
        struct intel_output *intel_output = to_intel_output(connector);
        struct intel_tv_priv *tv_priv = intel_output->dev_priv;
        int ret = 0;
+       bool changed = false;
 
        ret = drm_connector_property_set_value(connector, property, val);
        if (ret < 0)
                goto out;
 
-       if (property == dev->mode_config.tv_left_margin_property)
+       if (property == dev->mode_config.tv_left_margin_property &&
+               tv_priv->margin[TV_MARGIN_LEFT] != val) {
                tv_priv->margin[TV_MARGIN_LEFT] = val;
-       else if (property == dev->mode_config.tv_right_margin_property)
+               changed = true;
+       } else if (property == dev->mode_config.tv_right_margin_property &&
+               tv_priv->margin[TV_MARGIN_RIGHT] != val) {
                tv_priv->margin[TV_MARGIN_RIGHT] = val;
-       else if (property == dev->mode_config.tv_top_margin_property)
+               changed = true;
+       } else if (property == dev->mode_config.tv_top_margin_property &&
+               tv_priv->margin[TV_MARGIN_TOP] != val) {
                tv_priv->margin[TV_MARGIN_TOP] = val;
-       else if (property == dev->mode_config.tv_bottom_margin_property)
+               changed = true;
+       } else if (property == dev->mode_config.tv_bottom_margin_property &&
+               tv_priv->margin[TV_MARGIN_BOTTOM] != val) {
                tv_priv->margin[TV_MARGIN_BOTTOM] = val;
-       else if (property == dev->mode_config.tv_mode_property) {
+               changed = true;
+       } else if (property == dev->mode_config.tv_mode_property) {
                if (val >= NUM_TV_MODES) {
                        ret = -EINVAL;
                        goto out;
                }
+               if (!strcmp(tv_priv->tv_format, tv_modes[val].name))
+                       goto out;
+
                tv_priv->tv_format = tv_modes[val].name;
-               intel_tv_mode_set(&intel_output->enc, NULL, NULL);
+               changed = true;
        } else {
                ret = -EINVAL;
                goto out;
        }
 
-       intel_tv_mode_set(&intel_output->enc, NULL, NULL);
+       if (changed)
+               intel_tv_mode_set(&intel_output->enc, NULL, NULL);
 out:
        return ret;
 }