staging: drm/imx: don't drop crtc offsets when doing pageflip

CRTC offsets are only set with the initial modeset, any
subseqent pageflips assume them to be kept the same, so
we need to remember the current state until another modeset
changes it.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 6 insertions, 1 deletions

diff --git a/drivers/staging/imx-drm/ipuv3-crtc.c b/drivers/staging/imx-drm/ipuv3-crtc.c
index ce6ba987ec91..22be104fbda9 100644
--- a/drivers/staging/imx-drm/ipuv3-crtc.c
+++ b/drivers/staging/imx-drm/ipuv3-crtc.c
@@ -218,7 +218,8 @@ static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
 
         if (ipu_crtc->newfb) {
                 ipu_crtc->newfb = NULL;
-                ipu_plane_set_base(ipu_crtc->plane[0], ipu_crtc->base.fb, 0, 0);
+                ipu_plane_set_base(ipu_crtc->plane[0], ipu_crtc->base.fb,
+                                ipu_crtc->plane[0]->x, ipu_crtc->plane[0]->y);
                 ipu_crtc_handle_pageflip(ipu_crtc);
         }
 
diff --git a/drivers/staging/imx-drm/ipuv3-plane.c b/drivers/staging/imx-drm/ipuv3-plane.c
index 2ef95162b3e9..34b642a12f8b 100644
--- a/drivers/staging/imx-drm/ipuv3-plane.c
+++ b/drivers/staging/imx-drm/ipuv3-plane.c
@@ -83,6 +83,10 @@ int ipu_plane_set_base(struct ipu_plane *ipu_plane, struct drm_framebuffer *fb,
         ipu_cpmem_set_buffer(cpmem, 0, eba);
         ipu_cpmem_set_buffer(cpmem, 1, eba);
 
+        /* cache offsets for subsequent pageflips */
+        ipu_plane->x = x;
+        ipu_plane->y = y;
+
         return 0;
 }