[PATCH 2/2] drm/i915/hdmi: Enable pipe pixel replication for SD interlaced modes

[clinton.a.tay...@intel.com]

From: Clint Taylor <clinton.a.tay...@intel.com>

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 at intel.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: Ville Syrj?l? <ville.syrjala at linux.intel.com>
Reviewed-by: Ville Syrj?l? <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_hdmi.c |   15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c 
b/drivers/gpu/drm/i915/intel_hdmi.c
index 9169786..9695768 100644
--- 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;

-- 
1.7.9.5