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Subject[patch 021/100] drm/i915: only set TV mode when any property changed
-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: Zhenyu Wang <zhenyu.z.wang@intel.com>

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>
---
drivers/gpu/drm/i915/intel_tv.c | 27 ++++++++++++++++++++-------
1 file changed, 20 insertions(+), 7 deletions(-)

--- 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_connect
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;
}


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