drm/imx: extend drm_plane_state_to_eba for separate channel support

Allow to calculate EBA for planes other than plane 0. This is in
preparation for the following patch, which adds support for separate
alpha planes.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

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

@@ -66,18 +66,18 @@ int ipu_plane_irq(struct ipu_plane *ipu_plane)
 }
 
 static inline unsigned long
-drm_plane_state_to_eba(struct drm_plane_state *state)
+drm_plane_state_to_eba(struct drm_plane_state *state, int plane)
 {
 	struct drm_framebuffer *fb = state->fb;
 	struct drm_gem_cma_object *cma_obj;
 	int x = state->src.x1 >> 16;
 	int y = state->src.y1 >> 16;
 
-	cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
+	cma_obj = drm_fb_cma_get_gem_obj(fb, plane);
 	BUG_ON(!cma_obj);
 
-	return cma_obj->paddr + fb->offsets[0] + fb->pitches[0] * y +
-	       fb->format->cpp[0] * x;
+	return cma_obj->paddr + fb->offsets[plane] + fb->pitches[plane] * y +
+	       fb->format->cpp[plane] * x;
 }
 
 static inline unsigned long
@@ -85,7 +85,7 @@ drm_plane_state_to_ubo(struct drm_plane_state *state)
 {
 	struct drm_framebuffer *fb = state->fb;
 	struct drm_gem_cma_object *cma_obj;
-	unsigned long eba = drm_plane_state_to_eba(state);
+	unsigned long eba = drm_plane_state_to_eba(state, 0);
 	int x = state->src.x1 >> 16;
 	int y = state->src.y1 >> 16;
 
@@ -104,7 +104,7 @@ drm_plane_state_to_vbo(struct drm_plane_state *state)
 {
 	struct drm_framebuffer *fb = state->fb;
 	struct drm_gem_cma_object *cma_obj;
-	unsigned long eba = drm_plane_state_to_eba(state);
+	unsigned long eba = drm_plane_state_to_eba(state, 0);
 	int x = state->src.x1 >> 16;
 	int y = state->src.y1 >> 16;
 
@@ -286,7 +286,7 @@ static int ipu_plane_atomic_check(struct drm_plane *plane,
 	     fb->format != old_fb->format))
 		crtc_state->mode_changed = true;
 
-	eba = drm_plane_state_to_eba(state);
+	eba = drm_plane_state_to_eba(state, 0);
 
 	if (eba & 0x7)
 		return -EINVAL;
@@ -385,7 +385,7 @@ static void ipu_plane_atomic_update(struct drm_plane *plane,
 	if (ipu_plane->dp_flow == IPU_DP_FLOW_SYNC_FG)
 		ipu_dp_set_window_pos(ipu_plane->dp, dst->x1, dst->y1);
 
-	eba = drm_plane_state_to_eba(state);
+	eba = drm_plane_state_to_eba(state, 0);
 
 	if (old_state->fb && !drm_atomic_crtc_needs_modeset(crtc_state)) {
 		active = ipu_idmac_get_current_buffer(ipu_plane->ipu_ch);