[PATCH 3/3] drm/imx: ipuv3-crtc: implement fast path mode_set_base

[Stefan Christ]

Implementing the function "mode_set_base" for i.MX6 IPU enables the
fast-path in function drm_crtc_helper_set_config. The fast-path is used
when flag 'mode_changed' is false and flag 'fb_changed' is true.

The fast-patch is needed for applications using the legcay framebuffer
ioctl FBIOPAN_DISPLAY for buffer flipping. When the fast-patch is not
present, the ioctl FBIOPAN_DISPLAY causes a complete mode set which is
too interruptive.

Signed-off-by: Stefan Christ <s.christ at phytec.de>
---
 drivers/gpu/drm/imx/ipuv3-crtc.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/imx/ipuv3-crtc.c b/drivers/gpu/drm/imx/ipuv3-crtc.c
index fc04041..9858a57 100644
--- a/drivers/gpu/drm/imx/ipuv3-crtc.c
+++ b/drivers/gpu/drm/imx/ipuv3-crtc.c
@@ -234,6 +234,15 @@ static const struct drm_crtc_funcs ipu_crtc_funcs = {
 	.page_flip = ipu_page_flip,
 };
 
+int ipu_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
+				  struct drm_framebuffer *old_fb)
+{
+	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
+	struct ipu_plane *plane = ipu_crtc->plane[0];
+
+	return ipu_plane_set_base(plane, crtc->primary->fb, x, y);
+}
+
 static int ipu_crtc_mode_set(struct drm_crtc *crtc,
 			       struct drm_display_mode *orig_mode,
 			       struct drm_display_mode *mode,
@@ -378,6 +387,7 @@ static const struct drm_crtc_helper_funcs ipu_helper_funcs = {
 	.dpms = ipu_crtc_dpms,
 	.mode_fixup = ipu_crtc_mode_fixup,
 	.mode_set = ipu_crtc_mode_set,
+	.mode_set_base = ipu_crtc_mode_set_base,
 	.prepare = ipu_crtc_prepare,
 	.commit = ipu_crtc_commit,
 };
-- 
1.9.1