Applying an underscan setup is just a matter of scaling all planes
appropriately and adjusting the CRTC X/Y offset to account for the
horizontal and vertical border.
Create an vc4_plane_underscan_adj() function doing that and call it from
vc4_plane_setup_clipping_and_scaling() so that we are ready to attach
underscan properties to the HDMI connector.
Signed-off-by: Boris Brezillon <boris.brezillon at bootlin.com>
---
drivers/gpu/drm/vc4/vc4_plane.c | 49 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 48 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
index 71d44c357d35..7d5667b1f990 100644
--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -258,6 +258,49 @@ static u32 vc4_get_scl_field(struct drm_plane_state *state, int plane)
}
}
+static int vc4_plane_underscan_adj(struct drm_plane_state *pstate)
+{
+ struct vc4_plane_state *vc4_pstate = to_vc4_plane_state(pstate);
+ struct drm_connector_state *conn_state = NULL;
+ struct drm_connector *conn;
+ struct drm_crtc_state *crtc_state;
+ int i;
+
+ for_each_new_connector_in_state(pstate->state, conn, conn_state, i) {
+ if (conn_state->crtc == pstate->crtc)
+ break;
+ }
+
+ if (i == pstate->state->num_connector)
+ return 0;
+
+ if (conn_state->underscan.mode != DRM_UNDERSCAN_ON)
+ return 0;
+
+ crtc_state = drm_atomic_get_new_crtc_state(pstate->state,
+ pstate->crtc);
+
+ if (conn_state->underscan.hborder >= crtc_state->mode.hdisplay ||
+ conn_state->underscan.vborder >= crtc_state->mode.vdisplay)
+ return -EINVAL;
+
+ vc4_pstate->crtc_x += conn_state->underscan.hborder / 2;
+ vc4_pstate->crtc_y += conn_state->underscan.vborder / 2;
+ vc4_pstate->crtc_w = (vc4_pstate->crtc_w *
+ (crtc_state->mode.hdisplay -
+ conn_state->underscan.hborder)) /
+ crtc_state->mode.hdisplay;
+ vc4_pstate->crtc_h = (vc4_pstate->crtc_h *
+ (crtc_state->mode.vdisplay -
+ conn_state->underscan.vborder)) /
+ crtc_state->mode.vdisplay;
+
+ if (!vc4_pstate->crtc_w || !vc4_pstate->crtc_h)
+ return -EINVAL;
+
+ return 0;
+}
+
static int vc4_plane_setup_clipping_and_scaling(struct drm_plane_state *state)
{
struct drm_plane *plane = state->plane;
@@ -269,7 +312,7 @@ static int vc4_plane_setup_clipping_and_scaling(struct drm_plane_state *state)
int num_planes = fb->format->num_planes;
u32 h_subsample = 1;
u32 v_subsample = 1;
- int i;
+ int i, ret;
for (i = 0; i < num_planes; i++)
vc4_state->offsets[i] = bo->paddr + fb->offsets[i];
@@ -292,6 +335,10 @@ static int vc4_plane_setup_clipping_and_scaling(struct drm_plane_state *state)
vc4_state->crtc_w = state->crtc_w;
vc4_state->crtc_h = state->crtc_h;
+ ret = vc4_plane_underscan_adj(state);
+ if (ret)
+ return ret;
+
vc4_state->x_scaling[0] = vc4_get_scaling_mode(vc4_state->src_w[0],
vc4_state->crtc_w);
vc4_state->y_scaling[0] = vc4_get_scaling_mode(vc4_state->src_h[0],
--
2.14.1
