drm/i915/hdmi: Enable pipe pixel replication for SD interlaced modes

Enable 2x pixel replication for modes the mode flag DBLCLK to double
horizontal timings and pixel clock across TMDS.

Signed-off-by: Clint Taylor <clinton.a.taylor@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 9169786dbbc3f5118994968979f00c29bde879ae..96957683032e868b74aa734f168fec613794dc19 100644 (file)
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -864,10 +864,15 @@ static enum drm_mode_status
 intel_hdmi_mode_valid(struct drm_connector *connector,
                      struct drm_display_mode *mode)
 {
-       if (mode->clock > hdmi_portclock_limit(intel_attached_hdmi(connector),
-                                              true))
+       int clock = mode->clock;
+
+       if (mode->flags & DRM_MODE_FLAG_DBLCLK)
+               clock *= 2;
+
+       if (clock > hdmi_portclock_limit(intel_attached_hdmi(connector),
+                                        true))
                return MODE_CLOCK_HIGH;
-       if (mode->clock < 20000)
+       if (clock < 20000)
                return MODE_CLOCK_LOW;
 
        if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
@@ -921,6 +926,10 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
                        intel_hdmi->color_range = 0;
        }
 
+       if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK) {
+               pipe_config->pixel_multiplier = 2;
+       }
+
        if (intel_hdmi->color_range)
                pipe_config->limited_color_range = true;