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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: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Philipp Zabel 2014-10-08 17:19:14 +02:00 committed by Greg Kroah-Hartman
parent 7cd9bebee6
commit 356f952472
1 changed files with 11 additions and 2 deletions
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13
drivers/staging/imx-drm/ipuv3-plane.c
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@ -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;
ipu_cpmem_set_buffer(ipu_plane->ipu_ch, 0, eba);
ipu_cpmem_set_buffer(ipu_plane->ipu_ch, 1, eba);
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);