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

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

drivers/gpu/drm/i915/i915_drv.c

+2 −2
Original line number Diff line number Diff line
@@ -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);

drivers/gpu/drm/i915/intel_display.c

+3 −1
Original line number Diff line number Diff line
@@ -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);

}