diff options
| author | Jesse Barnes <jbarnes@virtuousgeek.org> | 2010-01-14 23:48:02 +0300 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2010-01-16 01:08:01 +0300 |
| commit | 33814341f22f13cec17e8d7fbf6f7e8000e3efa4 (patch) | |
| tree | 7f43f096589e6900fb11db0033d3e68086d7c475 /drivers/gpu/drm/i915/intel_lvds.c | |
| parent | 21bd770b9c90ee6a53a9dbb6293513a8c7654cfe (diff) | |
| download | linux-33814341f22f13cec17e8d7fbf6f7e8000e3efa4.tar.xz | |
drm/i915: disable LVDS downclock by default
Many platform support this feature, and it can provide significant
power savings when the reduced refresh rate is low. However, on some
platforms a secondary (reduced) timing is provided but not actually
supported by the hardware. This results in undesirable flicker at
runtime.
So disable the feature by default, but allow users to opt-in to the
reduced clock behavior with a new module parameter, lvds_downclock,
that can be set to 1 to enable the feature.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_lvds.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_lvds.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c index 5041590dfdc6..aa74e59bec61 100644 --- a/drivers/gpu/drm/i915/intel_lvds.c +++ b/drivers/gpu/drm/i915/intel_lvds.c @@ -926,7 +926,8 @@ static void intel_find_lvds_downclock(struct drm_device *dev, } } mutex_unlock(&dev->mode_config.mutex); - if (temp_downclock < panel_fixed_mode->clock) { + if (temp_downclock < panel_fixed_mode->clock && + i915_lvds_downclock) { /* We found the downclock for LVDS. */ dev_priv->lvds_downclock_avail = 1; dev_priv->lvds_downclock = temp_downclock; |