[Intel-gfx] [Patch 1/3]: [DRM/I915] : Sync the mode validation for INTERLACE/DBLSCAN

[yakui_zhao]

Subject: [DRM/I915]: Sync the mode validation for INTERLACE/DBLSCAN
From: Zhao Yakui <yakui.zhao at intel.com>

     Sync the mode validation for INTERLACE/DBLSCAN
     This covers:
     Check whether the INTERLACE/DBLSCAN is supported by output device. If
not, the mode containing the flag of INTERLACE/DBLSCAN will be marked
as unsupported.

Signed-off-by: Zhao Yakui <yakui.zhao at intel.com>
---
 drivers/gpu/drm/drm_crtc_helper.c |   25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

Index: linux-2.6/drivers/gpu/drm/drm_crtc_helper.c
===================================================================
--- linux-2.6.orig/drivers/gpu/drm/drm_crtc_helper.c	2009-03-20 11:47:32.000000000 +0800
+++ linux-2.6/drivers/gpu/drm/drm_crtc_helper.c	2009-03-20 13:36:22.000000000 +0800
@@ -41,6 +41,23 @@
 		   968, 1056, 0, 600, 601, 605, 628, 0,
 		   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
 };
+static void drm_mode_validate_flag(struct drm_connector *connector,
+			    int flags)
+{
+	struct drm_display_mode *mode, *t;
+	if (flags == (DRM_MODE_FLAG_DBLSCAN |
+			DRM_MODE_FLAG_INTERLACE))
+		return ;
+
+	list_for_each_entry_safe(mode, t, &connector->modes, head) {
+		if (mode->flags & DRM_MODE_FLAG_INTERLACE &&
+				!(flags & DRM_MODE_FLAG_INTERLACE))
+			mode->status = MODE_NO_INTERLACE;
+		if (mode->flags & DRM_MODE_FLAG_DBLSCAN &&
+				!(flags & DRM_MODE_FLAG_DBLSCAN))
+			mode->status = MODE_NO_DBLESCAN;
+	}
+}
 
 /**
  * drm_helper_probe_connector_modes - get complete set of display modes
@@ -96,6 +113,14 @@
 	if (maxX && maxY)
 		drm_mode_validate_size(dev, &connector->modes, maxX,
 				       maxY, 0);
+	{
+		int flags = (connector->interlace_allowed ?
+				DRM_MODE_FLAG_INTERLACE : 0) |
+				(connector->doublescan_allowed ?
+				DRM_MODE_FLAG_DBLSCAN : 0);
+		drm_mode_validate_flag(connector, flags);
+
+	}
 	list_for_each_entry_safe(mode, t, &connector->modes, head) {
 		if (mode->status == MODE_OK)
 			mode->status = connector_funcs->mode_valid(connector,