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authorJesse Barnes <jbarnes@virtuousgeek.org>2010-01-14 20:48:02 +0000
committerEric Anholt <eric@anholt.net>2010-01-15 14:08:01 -0800
commit33814341f22f13cec17e8d7fbf6f7e8000e3efa4 (patch)
tree7f43f096589e6900fb11db0033d3e68086d7c475 /drivers/gpu/drm/i915/intel_bios.c
parent21bd770b9c90ee6a53a9dbb6293513a8c7654cfe (diff)
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.c3
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 f2756774758..b53c46f202f 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. ",