[PATCH v2 3/4] imx-drm: ipuv3-plane: enable double buffering

[Philipp Zabel]

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.zabel at pengutronix.de>
---
Change since v1:
 - Added missing ipu_idmac_select_buffer call to make the hardware
   double buffering actually consider the newly set buffer.
---
 drivers/staging/imx-drm/ipuv3-plane.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/imx-drm/ipuv3-plane.c b/drivers/staging/imx-drm/ipuv3-plane.c
index 9f79a17..cca907f 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 +76,18 @@ 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);
+		ipu_idmac_select_buffer(ipu_plane->ipu_ch, !active);
+	} 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 +199,7 @@ 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);
-- 
2.1.0