Commit 356f9524 authored by Philipp Zabel's avatar Philipp Zabel Committed by Greg Kroah-Hartman
Browse files

imx-drm: ipuv3-plane: enable double buffering 



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: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7cd9bebe

drivers/staging/imx-drm/ipuv3-plane.c

+11 −2
Original line number Diff line number Diff line
@@ -64,6 +64,7 @@ int ipu_plane_set_base(struct ipu_plane *ipu_plane, struct drm_framebuffer *fb, 
{

	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) {
@@ -76,8 +77,15 @@ int ipu_plane_set_base(struct ipu_plane *ipu_plane, struct drm_framebuffer *fb, 


	eba = cma_obj->paddr + fb->offsets[0] +

	      fb->pitches[0] * y + (fb->bits_per_pixel >> 3) * x;



	if (ipu_plane->enabled) {

		active = ipu_idmac_get_current_buffer(ipu_plane->ipu_ch);

		ipu_cpmem_set_buffer(ipu_plane->ipu_ch, !active, eba);

		ipu_idmac_select_buffer(ipu_plane->ipu_ch, !active);

	} else {

		ipu_cpmem_set_buffer(ipu_plane->ipu_ch, 0, eba);

		ipu_cpmem_set_buffer(ipu_plane->ipu_ch, 1, eba);

	}



	/* cache offsets for subsequent pageflips */

	ipu_plane->x = x;
@@ -187,6 +195,7 @@ 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(ipu_plane->ipu_ch, fb->pitches[0]);



	ret = ipu_plane_set_base(ipu_plane, fb, src_x, src_y);