While the DMA channel is running, it is not allowed to change anything
but the inactive (double) buffer base address, so resizing a plane or
changing to a frame buffer with different pixel format is not possible.
Signed-off-by: Philipp Zabel <p.za...@pengutronix.de>
---
drivers/staging/imx-drm/ipuv3-plane.c | 15 +++++++++++++++
drivers/staging/imx-drm/ipuv3-plane.h | 2 ++
2 files changed, 17 insertions(+)
diff --git a/drivers/staging/imx-drm/ipuv3-plane.c
b/drivers/staging/imx-drm/ipuv3-plane.c
index ada0d11..3df8fe2 100644
--- a/drivers/staging/imx-drm/ipuv3-plane.c
+++ b/drivers/staging/imx-drm/ipuv3-plane.c
@@ -143,6 +143,18 @@ int ipu_plane_mode_set(struct ipu_plane *ipu_plane, struct
drm_crtc *crtc,
if (crtc_h < 2)
return -EINVAL;
+ /*
+ * since we cannot touch active IDMAC channels, we do not support
+ * resizing the enabled plane or changing its format
+ */
+ if (ipu_plane->enabled) {
+ if (src_w != ipu_plane->w || src_h != ipu_plane->h ||
+ fb->pixel_format != ipu_plane->base.fb->pixel_format)
+ return -EINVAL;
+
+ return ipu_plane_set_base(ipu_plane, fb, src_x, src_y);
+ }
+
switch (ipu_plane->dp_flow) {
case IPU_DP_FLOW_SYNC_BG:
ret = ipu_dp_setup_channel(ipu_plane->dp,
@@ -202,6 +214,9 @@ int ipu_plane_mode_set(struct ipu_plane *ipu_plane, struct
drm_crtc *crtc,
if (ret < 0)
return ret;
+ ipu_plane->w = src_w;
+ ipu_plane->h = src_h;
+
return 0;
}
diff --git a/drivers/staging/imx-drm/ipuv3-plane.h
b/drivers/staging/imx-drm/ipuv3-plane.h
index c0aae5b..af125fb 100644
--- a/drivers/staging/imx-drm/ipuv3-plane.h
+++ b/drivers/staging/imx-drm/ipuv3-plane.h
@@ -26,6 +26,8 @@ struct ipu_plane {
int x;
int y;
+ int w;
+ int h;
bool enabled;
};
--
2.1.0
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