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| author | Jesse Barnes <jbarnes@virtuousgeek.org> | 2010-01-14 20:48:02 +0000 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2010-01-15 14:08:01 -0800 |
| commit | 33814341f22f13cec17e8d7fbf6f7e8000e3efa4 (patch) | |
| tree | 7f43f096589e6900fb11db0033d3e68086d7c475 /drivers/gpu/drm/i915/intel_bios.c | |
| parent | 21bd770b9c90ee6a53a9dbb6293513a8c7654cfe (diff) | |
| download | linux-33814341f22f13cec17e8d7fbf6f7e8000e3efa4.tar.gz linux-33814341f22f13cec17e8d7fbf6f7e8000e3efa4.tar.bz2 linux-33814341f22f13cec17e8d7fbf6f7e8000e3efa4.zip | |
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_bios.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_bios.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c index f27567747580..b53c46f202f6 100644 --- a/drivers/gpu/drm/i915/intel_bios.c +++ b/drivers/gpu/drm/i915/intel_bios.c @@ -197,7 +197,8 @@ parse_lfp_panel_data(struct drm_i915_private *dev_priv, memset(temp_mode, 0, sizeof(*temp_mode)); } kfree(temp_mode); - if (temp_downclock < panel_fixed_mode->clock) { + if (temp_downclock < panel_fixed_mode->clock && + i915_lvds_downclock) { dev_priv->lvds_downclock_avail = 1; dev_priv->lvds_downclock = temp_downclock; DRM_DEBUG_KMS("LVDS downclock is found in VBT. ", |