[PATCH 01/14] drm/mgag200: Add doublescan and interlace support

[Takashi Iwai]

From: Egbert Eich <eich at suse.de>

This code was ported from the xorg mga driver.
The doublescreen_allowed and interlace_allowed flags are set
unconditionally for all models for now.

Signed-off-by: Egbert Eich <eich at suse.de>
Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
 drivers/gpu/drm/mgag200/mgag200_mode.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index f4b53588e071..1b2b117a48d1 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -1624,7 +1624,9 @@ static int mga_vga_mode_valid(struct drm_connector *connector,
 	struct drm_device *dev = connector->dev;
 	struct mga_device *mdev = (struct mga_device*)dev->dev_private;
 	int bpp = 32;
+	int lace;
 
+	lace = (mode->flags & DRM_MODE_FLAG_INTERLACE) ? 2 : 1;
 	if (IS_G200_SE(mdev)) {
 		if (mdev->unique_rev_id == 0x01) {
 			if (mode->hdisplay > 1600)
@@ -1676,8 +1678,10 @@ 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;
 	}
 
@@ -1737,6 +1741,9 @@ 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);
 
-- 
2.13.2