Commit 72bbe58c authored by Keith Packard's avatar Keith Packard

drm/i915: Allow SSC parameter to override VBT value

Allow SSC to be enabled even when the BIOS disables it for testing SSC paths.
Signed-off-by: default avatarKeith Packard <keithp@keithp.com>
Reviewed-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
parent d2830bdb
......@@ -79,11 +79,11 @@ MODULE_PARM_DESC(lvds_downclock,
"Use panel (LVDS/eDP) downclocking for power savings "
"(default: false)");
unsigned int i915_panel_use_ssc __read_mostly = 1;
unsigned int i915_panel_use_ssc __read_mostly = -1;
module_param_named(lvds_use_ssc, i915_panel_use_ssc, int, 0600);
MODULE_PARM_DESC(lvds_use_ssc,
"Use Spread Spectrum Clock with panels [LVDS/eDP] "
"(default: true)");
"(default: auto from VBT)");
int i915_vbt_sdvo_panel_type __read_mostly = -1;
module_param_named(vbt_sdvo_panel_type, i915_vbt_sdvo_panel_type, int, 0600);
......
......@@ -4584,7 +4584,9 @@ static void intel_update_watermarks(struct drm_device *dev)
static inline bool intel_panel_use_ssc(struct drm_i915_private *dev_priv)
{
return dev_priv->lvds_use_ssc && i915_panel_use_ssc
if (i915_panel_use_ssc >= 0)
return i915_panel_use_ssc != 0;
return dev_priv->lvds_use_ssc
&& !(dev_priv->quirks & QUIRK_LVDS_SSC_DISABLE);
}
......
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