4 files changed, 21 insertions, 17 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 0de75a23f8e7..72fea2bcfc4f 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -49,6 +49,9 @@ module_param_named(powersave, i915_powersave, int, 0600);
 unsigned int i915_lvds_downclock = 0;
 module_param_named(lvds_downclock, i915_lvds_downclock, int, 0400);
 
+unsigned int i915_panel_use_ssc = 1;
+module_param_named(lvds_use_ssc, i915_panel_use_ssc, int, 0600);
+
 bool i915_try_reset = true;
 module_param_named(reset, i915_try_reset, bool, 0600);
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 385fc7ec39d3..5969f46ac2d6 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -954,6 +954,7 @@ extern int i915_max_ioctl;
 extern unsigned int i915_fbpercrtc;
 extern unsigned int i915_powersave;
 extern unsigned int i915_lvds_downclock;
+extern unsigned int i915_panel_use_ssc;
 
 extern int i915_suspend(struct drm_device *dev, pm_message_t state);
 extern int i915_resume(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index b0b1200ed650..0b44956c336b 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -264,17 +264,12 @@ parse_general_features(struct drm_i915_private *dev_priv,
                 dev_priv->int_crt_support = general->int_crt_support;
                 dev_priv->lvds_use_ssc = general->enable_ssc;
 
-                if (dev_priv->lvds_use_ssc) {
-                        if (IS_I85X(dev))
-                                dev_priv->lvds_ssc_freq =
-                                        general->ssc_freq ? 66 : 48;
-                        else if (IS_GEN5(dev) || IS_GEN6(dev))
-                                dev_priv->lvds_ssc_freq =
-                                        general->ssc_freq ? 100 : 120;
-                        else
-                                dev_priv->lvds_ssc_freq =
-                                        general->ssc_freq ? 100 : 96;
-                }
+                if (IS_I85X(dev))
+                        dev_priv->lvds_ssc_freq = general->ssc_freq ? 66 : 48;
+                else if (IS_GEN5(dev) || IS_GEN6(dev))
+                        dev_priv->lvds_ssc_freq = general->ssc_freq ? 100 : 120;
+                else
+                        dev_priv->lvds_ssc_freq = general->ssc_freq ? 100 : 96;
         }
 }
 
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 25d96889d7d2..98967f3b7724 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3822,6 +3822,11 @@ static void intel_update_watermarks(struct drm_device *dev)
                                     sr_hdisplay, sr_htotal, pixel_size);
 }
 
+static inline bool intel_panel_use_ssc(struct drm_i915_private *dev_priv)
+{
+        return dev_priv->lvds_use_ssc && i915_panel_use_ssc;
+}
+
 static int intel_crtc_mode_set(struct drm_crtc *crtc,
                                struct drm_display_mode *mode,
                                struct drm_display_mode *adjusted_mode,
@@ -3884,7 +3889,7 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
                 num_connectors++;
         }
 
-        if (is_lvds && dev_priv->lvds_use_ssc && num_connectors < 2) {
+        if (is_lvds && intel_panel_use_ssc(dev_priv) && num_connectors < 2) {
                 refclk = dev_priv->lvds_ssc_freq * 1000;
                 DRM_DEBUG_KMS("using SSC reference clock of %d MHz\n",
                               refclk / 1000);
@@ -4059,7 +4064,7 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
                 udelay(200);
 
                 if (has_edp_encoder) {
-                        if (dev_priv->lvds_use_ssc) {
+                        if (intel_panel_use_ssc(dev_priv)) {
                                 temp |= DREF_SSC1_ENABLE;
                                 I915_WRITE(PCH_DREF_CONTROL, temp);
 
@@ -4070,13 +4075,13 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
 
                         /* Enable CPU source on CPU attached eDP */
                         if (!intel_encoder_is_pch_edp(&has_edp_encoder->base)) {
-                                if (dev_priv->lvds_use_ssc)
+                                if (intel_panel_use_ssc(dev_priv))
                                         temp |= DREF_CPU_SOURCE_OUTPUT_DOWNSPREAD;
                                 else
                                         temp |= DREF_CPU_SOURCE_OUTPUT_NONSPREAD;
                         } else {
                                 /* Enable SSC on PCH eDP if needed */
-                                if (dev_priv->lvds_use_ssc) {
+                                if (intel_panel_use_ssc(dev_priv)) {
                                         DRM_ERROR("enabling SSC on PCH\n");
                                         temp |= DREF_SUPERSPREAD_SOURCE_ENABLE;
                                 }
@@ -4104,7 +4109,7 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
                 int factor = 21;
 
                 if (is_lvds) {
-                        if ((dev_priv->lvds_use_ssc &&
+                        if ((intel_panel_use_ssc(dev_priv) &&
                              dev_priv->lvds_ssc_freq == 100) ||
                             (I915_READ(PCH_LVDS) & LVDS_CLKB_POWER_MASK) == LVDS_CLKB_POWER_UP)
                                 factor = 25;
@@ -4183,7 +4188,7 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
                 /* XXX: just matching BIOS for now */
                 /*      dpll |= PLL_REF_INPUT_TVCLKINBC; */
                 dpll |= 3;
-        else if (is_lvds && dev_priv->lvds_use_ssc && num_connectors < 2)
+        else if (is_lvds && intel_panel_use_ssc(dev_priv) && num_connectors < 2)
                 dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
         else
                 dpll |= PLL_REF_INPUT_DREFCLK;