[PATCH 16/16] drm/mgag200: Add doublescan and interlace support

[Egbert Eich]

This code was ported from the xorg mga driver.

Signed-off-by: Egbert Eich <eich at suse.com>
---
 drivers/gpu/drm/mgag200/mgag200_mode.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index 0bb0e1e..3faacbe 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -1488,6 +1488,7 @@ static int mga_vga_mode_valid(struct drm_connector *connector,
 	struct mga_fbdev *mfbdev = mdev->mfbdev;
 	struct drm_fb_helper *fb_helper = &mfbdev->helper;
 	struct drm_fb_helper_connector *fb_helper_conn = NULL;
+	int lace = 1 + ((mode->flags & DRM_MODE_FLAG_INTERLACE) ? 1 : 0);
 	int bpp = 32;
 	int i = 0;
 
@@ -1537,8 +1538,10 @@ static int mga_vga_mode_valid(struct drm_connector *connector,
 
 	if (mode->crtc_hdisplay > 2048 || mode->crtc_hsync_start > 4096 ||
 	    mode->crtc_hsync_end > 4096 || mode->crtc_htotal > 4096 ||
-	    mode->crtc_vdisplay > 2048 || mode->crtc_vsync_start > 4096 ||
-	    mode->crtc_vsync_end > 4096 || mode->crtc_vtotal > 4096) {
+	    mode->crtc_vdisplay > 2048 * lace ||
+	    mode->crtc_vsync_start > 4096 * lace ||
+	    mode->crtc_vsync_end > 4096 * lace ||
+	    mode->crtc_vtotal > 4096 * lace) {
 		return MODE_BAD;
 	}
 
@@ -1622,6 +1625,9 @@ static struct drm_connector *mga_vga_init(struct drm_device *dev)
 
 	connector = &mga_connector->base;
 
+	connector->interlace_allowed = true;
+	connector->doublescan_allowed = true;
+
 	drm_connector_init(dev, connector,
 			   &mga_vga_connector_funcs, DRM_MODE_CONNECTOR_VGA);
 
-- 
1.8.1.4