drm/imx: Add support for interlaced scanout

This patch allows interlaced frame buffer scanout for interlaced output
via HDMI or TV-Encoder.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

drivers/gpu/drm/imx/ipuv3-crtc.c

@@ -202,7 +202,8 @@ static int ipu_crtc_mode_set(struct drm_crtc *crtc,
 	return ipu_plane_mode_set(ipu_crtc->plane[0], crtc, mode,
 				  crtc->primary->fb,
 				  0, 0, mode->hdisplay, mode->vdisplay,
-				  x, y, mode->hdisplay, mode->vdisplay);
+				  x, y, mode->hdisplay, mode->vdisplay,
+				  mode->flags & DRM_MODE_FLAG_INTERLACE);
 }
 
 static void ipu_crtc_handle_pageflip(struct ipu_crtc *ipu_crtc)

drivers/gpu/drm/imx/ipuv3-plane.c

@@ -99,7 +99,7 @@ int ipu_plane_mode_set(struct ipu_plane *ipu_plane, struct drm_crtc *crtc,
 		       struct drm_framebuffer *fb, int crtc_x, int crtc_y,
 		       unsigned int crtc_w, unsigned int crtc_h,
 		       uint32_t src_x, uint32_t src_y,
-		       uint32_t src_w, uint32_t src_h)
+		       uint32_t src_w, uint32_t src_h, bool interlaced)
 {
 	struct device *dev = ipu_plane->base.dev->dev;
 	int ret;
@@ -213,6 +213,8 @@ int ipu_plane_mode_set(struct ipu_plane *ipu_plane, struct drm_crtc *crtc,
 	ret = ipu_plane_set_base(ipu_plane, fb, src_x, src_y);
 	if (ret < 0)
 		return ret;
+	if (interlaced)
+		ipu_cpmem_interlaced_scan(ipu_plane->ipu_ch, fb->pitches[0]);
 
 	ipu_plane->w = src_w;
 	ipu_plane->h = src_h;
@@ -312,7 +314,8 @@ static int ipu_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
 
 	ret = ipu_plane_mode_set(ipu_plane, crtc, &crtc->hwmode, fb,
 			crtc_x, crtc_y, crtc_w, crtc_h,
-			src_x >> 16, src_y >> 16, src_w >> 16, src_h >> 16);
+			src_x >> 16, src_y >> 16, src_w >> 16, src_h >> 16,
+			false);
 	if (ret < 0) {
 		ipu_plane_put_resources(ipu_plane);
 		return ret;

drivers/gpu/drm/imx/ipuv3-plane.h

@@ -42,7 +42,7 @@ int ipu_plane_mode_set(struct ipu_plane *plane, struct drm_crtc *crtc,
 		       struct drm_framebuffer *fb, int crtc_x, int crtc_y,
 		       unsigned int crtc_w, unsigned int crtc_h,
 		       uint32_t src_x, uint32_t src_y, uint32_t src_w,
-		       uint32_t src_h);
+		       uint32_t src_h, bool interlaced);
 
 void ipu_plane_enable(struct ipu_plane *plane);
 void ipu_plane_disable(struct ipu_plane *plane);