This allows to update the buffer base address while the DMA
channel is running. It is needed to flip the frame buffer of
an active plane.
Signed-off-by: Philipp Zabel <p.za...@pengutronix.de>
---
drivers/staging/imx-drm/ipuv3-plane.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/imx-drm/ipuv3-plane.c
b/drivers/staging/imx-drm/ipuv3-plane.c
index 9f79a17..9fdab14 100644
--- a/drivers/staging/imx-drm/ipuv3-plane.c
+++ b/drivers/staging/imx-drm/ipuv3-plane.c
@@ -65,6 +65,7 @@ int ipu_plane_set_base(struct ipu_plane *ipu_plane, struct
drm_framebuffer *fb,
struct ipu_ch_param __iomem *cpmem;
struct drm_gem_cma_object *cma_obj;
unsigned long eba;
+ int active;
cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
if (!cma_obj) {
@@ -75,11 +76,17 @@ int ipu_plane_set_base(struct ipu_plane *ipu_plane, struct
drm_framebuffer *fb,
dev_dbg(ipu_plane->base.dev->dev, "phys = %pad, x = %d, y = %d",
&cma_obj->paddr, x, y);
- cpmem = ipu_get_cpmem(ipu_plane->ipu_ch);
eba = cma_obj->paddr + fb->offsets[0] +
fb->pitches[0] * y + (fb->bits_per_pixel >> 3) * x;
- ipu_cpmem_set_buffer(cpmem, 0, eba);
- ipu_cpmem_set_buffer(cpmem, 1, eba);
+
+ cpmem = ipu_get_cpmem(ipu_plane->ipu_ch);
+ if (ipu_plane->enabled) {
+ active = ipu_idmac_get_current_buffer(ipu_plane->ipu_ch);
+ ipu_cpmem_set_buffer(cpmem, !active, eba);
+ } else {
+ ipu_cpmem_set_buffer(cpmem, 0, eba);
+ ipu_cpmem_set_buffer(cpmem, 1, eba);
+ }
/* cache offsets for subsequent pageflips */
ipu_plane->x = x;
@@ -191,6 +198,7 @@ int ipu_plane_mode_set(struct ipu_plane *ipu_plane, struct
drm_crtc *crtc,
return ret;
}
ipu_cpmem_set_high_priority(ipu_plane->ipu_ch);
+ ipu_idmac_set_double_buffer(ipu_plane->ipu_ch, 1);
ipu_cpmem_set_stride(cpmem, fb->pitches[0]);
ret = ipu_plane_set_base(ipu_plane, fb, src_x, src_y);
--
2.0.1
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